Different levels of adherence to the Mediterranean diet that do not change the risk of breast cancer in western women

Breast cancer (BC) is the most common neoplasm in women globally. Healthy eating, a characteristic of the Mediterranean diet (MD), has been associated with a lower risk of developing BC, although this relationship remains inconclusive. This study aimed to analyse the relationship between MD adherence and the risk of BC development. A case-control study was carried out with 181 women divided into two groups: with BC (n= 90) and without breast cancer (WBC) (n= 91). Clinical and reproductive aspects were investigated through interviews, and food consumption was assessed through a food frequency questionnaire (FFQ). Adherence to the MD was evaluated using the MD score. Statistical analysis was performed using SPSS® software, with p<0.05. The results showed that the main type of breast carcinoma was invasive ductal carcinoma, positive for oestrogen or progesterone receptors. The mean MD score was 4.08 ± 1.61 and 4.22 ± 1.69 among women with BC and without BC, respectively, with no difference between the groups. The risk assessment of BC with respect to adherence to MD showed no significant difference after adjustments were made in the logistic regression models. In conclusion, this study showed that women with and without breast cancer had "medium adherence" to MD, with no difference between the groups. In the group of women investigated, adherence to MD did not affect the risk of developing the disease.

El cáncer de mama (CM) es la neoplasia más frecuente entre las mujeres del mundo, y la alimentación saludable, característica del patrón de la dieta mediterránea (DM), se ha asociado con un menor riesgo de desarrollar CM, aunque esta relación sigue sin ser concluyente. El objetivo del estudio fue analizar la relación entre la adherencia a la DM y el riesgo para el desarrollo de CM. Estudio de casos y controles realizados con 181 mujeres divididas en dos grupos: con cáncer de mama (n=90) y sin cáncer de mama (SCM; n= 91). Los aspectos clínicos y reproductivos se evaluaron a través de una entrevista; consumo de alimentos a través del cuestionario de frecuencia alimentaria (FFQ) y adherencia a la dieta mediterránea evaluada según la puntuación de DM. El análisis estadístico se realizó mediante el software SPSS®, considerando valores significativos de p<0,05. Los resultados mostraron que el principal tipo de carcinoma de mama fue el carcinoma ductal invasivo, positivo para el receptor de estrógenos y progesterona. La puntuación media de DM fue de 4,08 ± 1,61 entre las mujeres con CM y de 4,22 ± 1,69 entre las que no tenían la enfermedad, sin diferencia entre los grupos. La evaluación del riesgo de CM en relación con la adherencia a la DM mostró que, después de ajustes en los modelos de regresión logística, no hubo diferencia significativa. En conclusión, el estudio muestra que las mujeres con y sin CM tuvieron "adherencia media" a la DM, sin diferencia entre los grupos. También mostró que, en el grupo de mujeres investigadas, la adherencia a la DM no influyó en el riesgo para el desarrollo de la enfermedad.

Antioxidant action and enzyme activity modulation by bioaccessible polyphenols from jambolan (Syzygium cumini (L.) Skeels).

Jambolan is rich in antioxidant polyphenols; however, the bioactivity of these compounds remains poorly investigated. We compared changes in polyphenols and antioxidant capacity by ABTS and FRAP assays of jambolan pulp during in vitro digestion and chemical extraction and evaluated the effects of these changes on oxidative stress in wild and mutant Saccharomyces cerevisiae. Digestion and chemical extraction were performed with enzyme saline solutions, deionized water, and 50% (v/v) aqueous acetone solution. Caffeic, quinic, gallic, and ellagic acids, isomers of myricetin, catechin, and anthocyanins are bioaccessible during gastric digestion. In the duodenum, flavonoids and proanthocyanidins remained stable when the pH changed from acidic to neutral/alkaline, whereas anthocyanins were degraded when exposed to pH 7. In the colon, anthocyanins were not identified. The antioxidant activity of bioaccessible fractions is correlated with non-anthocyanin flavonoids and proanthocyanidins, reflected in the modulation of antioxidant enzymes of S. cerevisiae. The digestion process favors the release of bio-polyphenols from jambolan with preventive, scavenger, and reparative antioxidant action. They also stimulate the production and activity of Sod and Cat, strengthening the endogenous antioxidant system.

Effects of vitamin D supplementation on the glycemic control of pre-diabetic individuals: a systematic review / Efectos de la suplementación con vitamina D sobre el control glucémico en pacientes prediabéticos: una revisión sistemática

INTRODUCTION: research shows the potential effect of vitamin D supplementation with an improvement in the glycemic profile of pre-diabetic patients. OBJECTIVE: this study evaluates the effects of vitamin D supplementation on glycemic control markers in pre-diabetic individuals. METHODS: we analyzed studies published over the last ten years, and indexed in the Science Direct, PubMed, and LILACS databases. We searched studies using health descriptors related to vitamin D, pre-diabetes, and glycemic control markers. We considered randomized controlled trials eligible for inclusion. All phases of selection, data extraction, and risk of bias assessment were carried out by two independent evaluators. RESULTS: we identified 309 articles, of which 4 met the inclusion criteria. Of these, 3 studies have shown that vitamin D supplementation does not alter glycemic control markers in pre-diabetic individuals. Only one study showed a positive effect after supplementation with 60,000 IU/month of vitamin D3 for 12 months, with a significant reduction in the concentrations of glycated hemoglobin, fasting glucose, and two-hour postprandial glucose. CONCLUSION: there is insufficient scientific evidence to confirm the beneficial effects of vitamin D supplementation on glycemic control markers in pre-diabetic individuals

INTRODUCCIÓN: las investigaciones muestran el efecto potencial de la suplementación con vitamina D con una mejora del perfil glucémico de los pacientes prediabéticos. OBJETIVO: este estudio evalúa los efectos de la suplementación con vitamina D sobre los marcadores de control glucémico en personas prediabéticas. MÉTODOS: analizamos los estudios publicados en los últimos diez años e indexados en las bases de datos Science Direct, PubMed y LILACS. Se realizaron búsquedas de estudios mediante descriptores de salud relacionados con la vitamina D, la prediabetes y los marcadores de control glucémico. Los ensayos controlados y aleatorizados se consideraron elegibles para su inclusión. Todas las fases de selección, extracción de datos y evaluación del riesgo de sesgos fueron realizadas por dos evaluadores independientes. RESULTADOS: identificamos 309 artículos, de los que 4 cumplieron los criterios de inclusión. De estos, 3 estudios demostraron que la suplementación con vitamina D no altera los marcadores de control glucémico en las personas prediabéticas. Solo un estudio mostró un efecto positivo después de la suplementación de 60.000 UI/mes de vitamina D3 durante 12 meses, con una reducción significativa de las concentraciones de hemoglobina glucosilada, glucosa en ayunas y glucosa posprandial a las dos horas. CONCLUSIÓN: no hay evidencia científica suficiente para confirmar los efectos beneficiosos de la suplementación de vitamina D sobre los marcadores de control glucémico en las personas prediabéticas

Effects of vitamin D supplementation on the glycemic control of pre-diabetic individuals: a systematic review.

INTRODUCTION: Introduction: research shows the potential effect of vitamin D supplementation with an improvement in the glycemic profile of pre-diabetic patients. Objective: this study evaluates the effects of vitamin D supplementation on glycemic control markers in pre-diabetic individuals. Methods: we analyzed studies published over the last ten years, and indexed in the Science Direct, PubMed, and LILACS databases. We searched studies using health descriptors related to vitamin D, pre-diabetes, and glycemic control markers. We considered randomized controlled trials eligible for inclusion. All phases of selection, data extraction, and risk of bias assessment were carried out by two independent evaluators. Results: we identified 309 articles, of which 4 met the inclusion criteria. Of these, 3 studies have shown that vitamin D supplementation does not alter glycemic control markers in pre-diabetic individuals. Only one study showed a positive effect after supplementation with 60,000 IU/month of vitamin D3 for 12 months, with a significant reduction in the concentrations of glycated hemoglobin, fasting glucose, and two-hour postprandial glucose. Conclusion: there is insufficient scientific evidence to confirm the beneficial effects of vitamin D supplementation on glycemic control markers in pre-diabetic individuals.

INTRODUCCIÓN: Introducción: las investigaciones muestran el efecto potencial de la suplementación con vitamina D con una mejora del perfil glucémico de los pacientes prediabéticos. Objetivo: este estudio evalúa los efectos de la suplementación con vitamina D sobre los marcadores de control glucémico en personas prediabéticas. Métodos: analizamos los estudios publicados en los últimos diez años e indexados en las bases de datos Science Direct, PubMed y LILACS. Se realizaron búsquedas de estudios mediante descriptores de salud relacionados con la vitamina D, la prediabetes y los marcadores de control glucémico. Los ensayos controlados y aleatorizados se consideraron elegibles para su inclusión. Todas las fases de selección, extracción de datos y evaluación del riesgo de sesgos fueron realizadas por dos evaluadores independientes. Resultados: identificamos 309 artículos, de los que 4 cumplieron los criterios de inclusión. De estos, 3 estudios demostraron que la suplementación con vitamina D no altera los marcadores de control glucémico en las personas prediabéticas. Solo un estudio mostró un efecto positivo después de la suplementación de 60.000 UI/mes de vitamina D3 durante 12 meses, con una reducción significativa de las concentraciones de hemoglobina glucosilada, glucosa en ayunas y glucosa posprandial a las dos horas. Conclusión: no hay evidencia científica suficiente para confirmar los efectos beneficiosos de la suplementación de vitamina D sobre los marcadores de control glucémico en las personas prediabéticas.

Inflammatory Bowel Diseases and diet: an integrative review.

OBJECTIVE: To gather scientific evidence on the role of diet in inflammatory bowel diseases. METHODS: Integrative review with studies published in the last 10 years in national and international journals. Original studies developed with adult human beings aged ≥18 years were included and articles published before 2010, literature reviews, and those that did not focus on elements that answered the guiding question were excluded. RESULTS: 14 articles were selected that addressed important dietary elements in inflammatory bowel disease such as fermentable carbohydrates and polyols, foods of animal origin, foods rich in omega 3, consumption of fruits and vegetables, use of probiotic supplements, whey proteins and soy. CONCLUSION: The diet, as a potentially modifiable environmental factor, plays an important role in the prevention and treatment of inflammatory bowel diseases. The reduction in the consumption of fermentable carbohydrates and polyols combined with the increase in the consumption of fruits and vegetables as well as the exclusion of products of animal origin such as beef, pork, milk and eggs can help control inflammation and improve the quality of life of patients with inflammatory bowel diseases. The use of probiotics increases food tolerance and, whey and soy proteins, can alter body composition and reduce inflammation.

Inflammatory Bowel Diseases and diet: an integrative review

SUMMARY OBJECTIVE: To gather scientific evidence on the role of diet in inflammatory bowel diseases. METHODS: Integrative review with studies published in the last 10 years in national and international journals. Original studies developed with adult human beings aged ≥18 years were included and articles published before 2010, literature reviews, and those that did not focus on elements that answered the guiding question were excluded. RESULTS: 14 articles were selected that addressed important dietary elements in inflammatory bowel disease such as fermentable carbohydrates and polyols, foods of animal origin, foods rich in omega 3, consumption of fruits and vegetables, use of probiotic supplements, whey proteins and soy. CONCLUSION: The diet, as a potentially modifiable environmental factor, plays an important role in the prevention and treatment of inflammatory bowel diseases. The reduction in the consumption of fermentable carbohydrates and polyols combined with the increase in the consumption of fruits and vegetables as well as the exclusion of products of animal origin such as beef, pork, milk and eggs can help control inflammation and improve the quality of life of patients with inflammatory bowel diseases. The use of probiotics increases food tolerance and, whey and soy proteins, can alter body composition and reduce inflammation.

RESUMO OBJETIVO: Reunir evidências científicas sobre o papel da dieta nas doenças inflamatórias intestinais. MÉTODOS: Revisão integrativa com estudos publicados nos últimos 10 anos em periódicos nacionais e internacionais. Foram incluídos estudos originais desenvolvidos com seres humanos adultos com idade ≥18anos e excluídos artigos publicados antes de 2010, revisões de literatura, e os que não apresentassem como foco elementos que respondessem a pergunta norteadora. RESULTADOS: Foram selecionados 14 artigos que abordaram elementos dietéticos importantes na doença inflamatória intestinal como carboidratos e polióis fermentáveis, alimentos de origem animal, alimentos ricos em ômega 3, consumo de frutas e vegetais, uso de suplementos com probióticos, proteínas do soro do leite e soja. CONCLUSÃO: A dieta, como fator ambiental potencialmente modificável desempenha importante papel na prevenção e tratamento das doenças inflamatórias intestinas. A redução no consumo de carboidratos e polióis fermentáveis aliado ao aumento do consumo de frutas e vegetais como também a exclusão de produtos de origem animal como carne bovina, carne suína, leite e ovo podem auxiliar no controle da inflamação e melhoria da qualidade de vida dos pacientes com doenças inflamatórias intestinais. O uso de probióticos aumenta a tolerância alimentar e, proteínas do soro do leite e soja, podem alterar a composição corporal e reduzir a inflamação.

Relationship between selenium status and biomarkers of oxidative stress in Crohn's disease.

OBJECTIVE: Crohn disease (CD) is characterized by chronic intestinal inflammation and various factors involved in its pathogenesis including oxidative stress. The oxidative stress in CD may compromise antioxidant nutrients, such as selenium. The aim of this study was to assess the status of selenium and its relationship with markers of oxidative stress in patients with CD in comparison to controls. METHODS: The study included 47 patients with CD (20 with active disease and 27 in remission) and 25 healthy individuals. Blood samples were collected for the analysis of plasma and erythrocyte selenium concentrations using inductively coupled plasma optical emission spectrometry (ICP-OES). Selenoprotein P (SepP) was evaluated by sandwich enzyme-linked immunosorbent assay, erythrocyte glutathione peroxidase (GPx1) activity was assessed by using an automatic biochemistry analyzer, and the concentration of thiobarbituric acid reactive substances (TBARS) was measured. Comparative analyses were performed using one-way analysis of variance and Tukey's post hoc test. For correlations, Pearson's coefficient test was used. The determinants for CD and lipid peroxidation were indicated by odds ratio. RESULTS: Plasma and erythrocyte selenium levels and SepP concentrations were lower in the CD patient groups than in the healthy group. GPx1 activity and the concentration of TBARS were significantly higher in the CD groups. In the univariate analysis, plasma and erythrocyte selenium and TBARS were associated with CD. CONCLUSION: Patients with CD have impaired selenium status, which is related to the increased oxidative stress observed in these patients.

Zinc gluconate supplementation impacts the clinical improvement in patients with ulcerative colitis.

Ulcerative colitis is an inflammatory bowel disease that affects the mucous membrane of the colon. The pathogenesis is not clear, but there is evidence of a complex interaction between genetic, environmental, and immunological factors. In this regard, we highlight the role of zinc in the immune system and probable control of the disease. This study evaluated the effect of zinc supplementation on the inflammatory response in patients with ulcerative colitis. A blind interventional study involving 41 patients of both sexes, who underwent either zinc gluconate supplementation (n = 23), or treatment with a placebo (corn starch) (n = 18). Patients were evaluated for dietary zinc intake, plasma and erythrocyte zinc concentrations, and serum levels of Th1/Th2/Th17 type cytokines at baseline (T0) and 30 (T1) and 60 (T2) days after intervention. Patients in the zinc supplementation group had a lower probability of having an adequate zinc intake than placebo. In this same group, there was a significant difference between plasma zinc concentrations (T1 in relation to T0, T2 in relation to T1, and T2 in relation to T0) and erythrocyte zinc (T1 in relation to T0 and T2 in relation to T1). Zinc supplementation resulted in significant changes in the concentrations of IL-2 and IL-10 without differences in the other interleukins. Zinc gluconate intervention in patients with ulcerative colitis improves the nutritional status of this mineral in these patients and positively influences their clinical outcome, reinforcing the role of zinc as an important dietary component in disease control.

No Relation Between Zinc Status and Inflammatory Biomarkers in Adolescent Judokas.

This study aimed to assess the relation between zinc status and inflammation biomarkers in adolescent judokas. This cross-sectional study included 52 male adolescents, aged between 14 and 19 years, who were subdivided into two groups: judoka group (n = 25) and control group (n = 27). Zinc intake was monitored using 3-day food records and the NutWin software version 1.5. The plasma and erythrocyte zinc concentrations were determined by flame atomic absorption spectrophotometry. Analysis of cytokines (IL-1ß, IL-6, and TNF-α) was performed. The mean values of zinc concentration in the diet were found to be higher than those recommended (11.0±3.9 mg/day and 20.3±11.9 mg/day for control group and judokas, respectively) although there was no significant difference between the groups. The mean plasma concentrations of zinc were below the reference range (71.4±16.0 µg/dL and 71.9±13.8 µg/dL for control group and judokas, respectively), without a significant difference between the groups. The mean concentrations of zinc erythrocyte were within the reference range (41.2±8.6 µg/gHb and 42.6±11.3 µg/gHb for control group and judokas, respectively), without a significant difference between the groups. There was no significant difference in the inflammatory biomarkers between the judokas and controls. There was not a significant correlation between biochemical parameters of zinc and inflammation biomarkers in adolescent judokas. Regarding the data found in the study, it can be concluded that the athletes evaluated have low plasma zinc concentrations, normal erythrocyte values, and high dietary intake of zinc. Moreover, the study don't show a relationship between zinc parameters and inflammatory markers evaluated.

Consumption of nutrients with antioxidant action and its relationship with lipid profile and oxidative stress in student users of a university restaurant.

INTRODUCTION: The relationship between diet and health has aroused scientific interest, especially the consumption of antioxidant nutrients naturally present in foods, because of its action against the deleterious effects of free radicals in the body. OBJECTIVE: This study aimed to estimate the intake of antioxidant nutrients and its relationship with lipid profile and oxidative stress in student users of a university restaurant in comparison with non-users. METHODS: This cross-sectional study involved 145 university students divided into two groups: users of the university restaurant (group 1, n = 73) and non-users (group 2, n = 72). We measured body mass index and waist circumference, and estimated the intake of antioxidant micronutrients. Serum concentrations of total cholesterol, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, and triglyceride levels, and plasma concentrations of malondialdehyde were determined. RESULTS AND CONCLUSIONS: Intake of copper, zinc, selenium, and vitamin C were within the recommendations in both groups, and vitamins A and E were below the reference values. There was a correlation between the intake of vitamin C and triglycerides. Group 1 members had better dietary patterns in relation to antioxidant micronutrients, reflecting less atherogenic lipid profile and lower exposure to oxidative stress compared to group 2.

Mineral status and superoxide dismutase enzyme activity in Alzheimer's disease.

The study evaluated the dietary intake of zinc and copper, as measured by plasma and erythrocyte concentrations, the Cu/Zn ratio and measure the erythrocyte superoxide dismutase enzyme (eSOD) activity and the relationship between these markers and the degree of dementia in elderly individuals with and without Alzheimer's Disease (AD). A total of 93 elderly people aged 60-94 years were divided into two groups: with AD (n=44) and without AD (n=49). The NINCDS-ADRDA criteria were used for diagnosing AD, and dementia staging was determined using the Clinical Dementia Rating (CDR) scale. The dietary intake of Zn and Cu was obtained from a standard 3-day food record. Plasma and erythrocyte concentrations of the minerals were determined by flame atomic absorption spectrophotometry and by measuring eSOD activity in an automatic biochemical analyzer. The results showed dietary intake of Zn and Cu above the reference values with no differences observed between the two groups (p>0.05). Plasma and erythrocyte normocupremia as well as alteration in the Zn pool, with its reduced plasma concentrations and high in the erythrocytes, were observed in both groups (p>0.05). The plasma Cu/Zn ratio were not significantly different in patients with and without AD (p>0.05). The eSOD activity was high in both patient groups (p>0.05). However, among elderly patients with AD there was a positive correlation between this marker and dementia severity. According to our study results, we conclude that plasma and erythrocyte concentrations of Cu and Zn, as well as Cu/Zn ratio among elderly individuals is not related to Alzheimer's Disease. However, antioxidant activity of eSOD is associated with dementia severity.

Consumption of nutrients with antioxidant action and its relationship with lipid profile and oxidative stress in student users of a university restaurant / El consumo de nutrientes con acción antioxidante y su relación con el perfil lipídico y el estrés oxidativo en los estudiantes usuarios del restaurante de una universidad

Introduction: The relationship between diet and health has aroused scientific interest, especially the consumption of antioxidant nutrients naturally present in foods, because of its action against the deleterious effects of free radicals in the body. Objective: This study aimed to estimate the intake of antioxidant nutrients and its relationship with lipid profile and oxidative stress in student users of a university restaurant in comparison with non-users. Methods: This cross-sectional study involved 145 university students divided into two groups: users of the university restaurant (group 1, n = 73) and non-users (group 2, n = 72). We measured body mass index and waist circumference, and estimated the intake of antioxidant micronutrients. Serum concentrations of total cholesterol, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, and triglyceride levels, and plasma concentrations of malondialdehyde were determined. Results and conclusion: Intake of copper, zinc, selenium, and vitamin C were within the recommendations in both groups, and vitamins A and E were below the reference values. There was a correlation between the intake of vitamin C and triglycerides. Group 1 members had better dietary patterns in relation to antioxidant micronutrients, reflecting less atherogenic lipid profile and lower exposure to oxidative stress compared to group 2 (AU)

Introducción: la relación entre la dieta y la salud ha despertado interés científico, especialmente en lo referente al consumo de nutrientes antioxidantes presentes de forma natural en los alimentos, debido a su acción contra los efectos nocivos de los radicales libres en el cuerpo. Objetivo: el objetivo de este estudio fue estimar la ingesta de nutrientes antioxidantes y su relación con el perfil lipídico y el estrés oxidativo en estudiantes usuarios de un restaurante universitario, en comparación con los no usuarios. Métodos: este es un estudio transversal que incluye 145 estudiantes universitarios, divididos en dos grupos: los usuarios del restaurante universitario (grupo 1, n = 73) y no usuarios (grupo 2, n = 72). Fueron medidos el índice de masa corporal y la circunferencia de la cintura, y se estimó la ingesta de micronutrientes antioxidantes. Se determinaron las concentraciones séricas de colesterol total, colesterol unido a lipoproteínas de alta densidad, colesterol unido a lipoproteínas de baja densidad, los niveles de triglicéridos y las concentraciones plasmáticas de malondialdehído. Resultados y conclusiones: la ingesta de cobre, zinc, selenio y la vitamina C se encontraba dentro de las recomendaciones de los dos grupos, y la de vitaminas A y E estaba por debajo de los valores de referencia. Hubo una correlación entre el consumo de vitamina C y los triglicéridos. Miembros del grupo 1 mostraron mejores patrones dietéticos en relación con micronutrientes antioxidantes, lo que refleja menos perfil lipídico aterogénico y una menor exposición al estrés oxidativo en comparación con el grupo 2 (AU)

Status do Zinco e sua Relação com Biomarcadores de Risco Cardiovascular / Zinc Status of and its Association to Cardiovascular Risk Biomarkers

Fundamento: A ação antioxidante de alguns nutrientes é importante na proteção vascular. O zinco, em particular, tem sido associado a um risco reduzido de aterosclerose, acidente vascular cerebral e trombose.Objetivo: O estudo avaliou o status do zinco e sua relação com biomarcadores de risco cardiovascular em adultos saudáveis. Métodos: Estudo transversal com 186 estudantes universitários de ambos os sexos, com idades entre 20 e 30 anos, selecionados através de amostra por conveniência. As medições dos biomarcadores de risco cardiovascular incluíram o perfil lipídico, o índice de Castelli I e II e circunferência da cintura. O zinco dietético foi avaliado por registro alimentar de três dias utilizando o programa NutWin versão 1.6.0.7. As concentrações plasmáticas e de eritrócitos do mineral foram determinadas por espectrofotometria de absorção atômica com chama. O perfil lipídico foi determinado pelo método enzimático colorimétrico. Resultados: Os valores médios do consumo de zinco estavam superiores à NME (Necessidade Média Estimada) em ambos os sexos. Os participantes apresentaram concentrações médias de zinco no plasma e eritrócitos inferiores aos pontos de corte. Os valores médios do perfil lipídico, índice de Castelli I e II, e circunferência da cintura estavam adequados. Houve correlação negativa entre o zinco dietético e colesterol total e triglicérides. Conclusões: Os participantes têm uma ingestão elevada de zinco e apresentam concentrações plasmáticas e eritrocitárias reduzidas do mineral. Além disso, esse estudo revelou uma associação negativa entre a ingestão de zinco dietético e o colesterol total e triglicérides, biomarcadores do risco cardiovascular, sugerindo a importância do zinco na proteção contra doenças cardiovasculares

Background: The antioxidant action of some nutrients is important in vascular protection. Zinc, particularly, has been associated with reduced risk of atherosclerosis, stroke and thrombosis. Objective: The study evaluated zinc status and its association to cardiovascular risk biomarkers in healthy adults. Methods: Cross-sectional study with 186 university students of both genders, aged between 20 and 30 years, selected using the convenience sampling method. The cardiovascular risk biomarker measurements included the lipid profile, Castelli index I and II, and waist circumference. Zinc analysis was performed by a three-days food record using NutWin program version 1.6.0.7. Plasma and erythrocyte mineral concentrations were determined by flame atomic absorption spectrophotometry. The lipid profile was determined by enzymatic colorimetric methods. Results: The mean values of zinc intake were higher than the EAR in both genders. Participants had mean plasma and erythrocyte zinc concentrations lower than the cutoff points. The mean values of the lipid profile, Castelli index I and II, and waist circumference were adequate. There was a negative correlation between dietary zinc and total cholesterol and triglycerides. Conclusions: The participants have a high dietary zinc intake and reduced plasma and erythrocyte concentrations of this mineral. Additionally, this study showed a negative association between zinc dietary intake and total cholesterol and triglycerides, biomarkers of cardiovascular risk, suggesting the importance of zinc in protecting against cardiovascular disease

Relationship between zincemia, superoxide dismutase activity and marker of oxidative stress in women with breast cancer / Relación entre zincemia, actividad de la enzima superóxido dismutasa y marcador de estrés oxidativo en mujeres con cáncer de mama

Introduction: studies show changes in zinc metabolism in women with breast cancer. This mineral has antioxidant action, and disorders in its biochemical parameters are related to poor prognosis of the disease and increase in the carcinogenic process. Objective: this study evaluated the activity of enzyme superoxide dismutase and biochemical parameters related to zinc, and investigated the existence of correlation between these variables and the marker of oxidative stress in these patients. Methods: this was a case-control study with 66 women aged between 20 and 50 years old, distributed into: case group (women with breast cancer, n=34) and control group (healthy women, n=32). Zinc intake was analyzed by three-day food diary, using Nutwin software, version 1.5. Plasma and erythrocyte zinc concentrations were determined by flame atomic absorption spectrophotometry method (λ=213.9). Superoxide dismutase activity was assessed by Griess colorimetric method, and plasma thiobarbituric acid reactive substances (TBARS) were analyzed. Results and discussion: mean levels of zinc intake, superoxide dismutase and TBARS were higher than recommended for the study participants with statistical difference for enzyme superoxide dismutase (p0.05). Conclusions: therefore, it can be assumed that zinc intake in women with breast cancer does not impact plasma and erythrocyte concentrations of this mineral. High superoxide dismutase activity in women with breast cancer may be due to a compensatory mechanism of regulation via oxidative stress found in this disease (AU)

Introducción: diversos estudios muestran alteraciones en el metabolismo del zinc en mujeres con cáncer de mama. Este mineral posee acción antioxidante, y los disturbios en sus parámetros bioquímicos están relacionados con peor pronóstico de la enfermedad y agravamiento del proceso carcinogénico. Objetivos: este estudio evaluó la actividad de la enzima superóxido dismutasa y los parámetros bioquímicos relativos al zinc e investigó la existencia de correlación entre esas variables y el marcador del estrés oxidativo en estas pacientes. Métodos: este fue un estudio caso-control con 66 mujeres, con edad ente 20 y 50 años, distribuidas en: grupo caso (mujeres con cáncer de mama, n=34) y grupo control (mujeres saludables, n=32). La ingestión del zinc fue realizada por medio del registro alimentario de tres días, utilizando el programa Nutwin versión 1.5. Las concentraciones de zinc plasmático y eritrocitario fueron determinadas según el método de espectrofotometría de absorción atómica de llama (λ=213,9). La actividad de la superóxido dismutasa fue evaluada por el método colorimétrico de Griess y fueron analizadas sustancias reactivas al ácido tiobarbitúrico (TBARS). Resultados y discusión: los valores medios de la ingestión de zinc, superóxido dismutasa y TARBS eran superiores a los recomendados para las participantes del estudio, con una diferencia estadística para la enzima superóxido dismutasa (p>0,05). La media de las concentraciones plasmática y eritrocitaria de zinc fueron reducidos en ambos grupos (p>0.05). Conclusiones: por lo tanto, se puede suponer que la ingesta de zinc en mujeres con cáncer de mama no influye en las concentraciones plasmáticas y eritrocitarias de ese mineral. La elevada actividad de la superóxido dismutasa en las mujeres con cáncer de mama puede ser debida a un mecanismo de regulación compensatorio mediante el estrés oxidativo presente en esa enfermedad (AU)

Effect of zinc supplementation on superoxide dismutase activity in patients with ulcerative rectocolitis / Efecto de la suplementación de zinc sobre la actividad de la enzima superóxido dismutasa (SOD) en pacientes con colitis ulcerosa

Introduction: Ulcerative rectocolitis is characterized by diffuse mucosal inflammation and oxidative stress. Thus, the organism activates the antioxidant defence system in an attempt to reduce the excessive production of reactive oxygen species or neutralize them. Objective: This study evaluated the effect of zinc supplementation on the activity of the enzyme superoxide dismutase (SOD) in patients with ulcerative rectocolitis. Methods: The study included 24 patients, aged between 20 and 59 years and diagnosed with ulcerative rectocolitis, in the remission stage of the disease, who were divided into two groups: experimental - deficient in zinc (n=12) and control - normal or high zinc (n=12). Only the first group underwent supplement intervention, in the form of zinc gluconate (30 mg Zn/day), taken daily in the morning, fasted for 60 days. Plasma and erythrocyte zinc concentrations were determined by flame atomic absorption spectrophotometer. The erythrocyte SOD activity was determined in vitro according to the methodology recommended by the manufacturer Randox. Results and Discussion: Zinc supplementation caused a significant increase in the plasma concentrations of the mineral, and showed a significant reduction in erythrocyte zinc, remaining within normal limits. The SOD activity was high in patients of both the experimental and control groups, with no difference after supplementation. Conclusion: This study demonstrates that zinc supplementation improves the homeostatic condition of the mineral, with no change in SOD activity, as a marker of oxidative stress in patients with ulcerative rectocolitis (AU)

Introducción: La colitis ulcerosa se caracteriza por la inflamación difusa de la mucosa y el estrés oxidativo. De esta forma, el cuerpo activa el sistema de defensa antioxidante en un intento de reducir la producción excesiva de especies reactivas de oxígeno, así como poder neutralizarlos. Objetivo: Este estudio evaluó el efecto de la suplementación de zinc sobre la actividad de la enzima superóxido dismutasa en pacientes con colitis ulcerosa. Métodos: El estudio incluyó 24 pacientes, con edades comprendidas entre 20 y 59 años y con diagnóstico de colitis ulcerosa en fase de remisión de la enfermedad. Los pacientes fueron divididos en dos grupos: experimental - deficiencia de zinc (n = 12) y control - normales o con altos contenido de zinc (n = 12). El grupo experimental se sometió a tratamiento con suplemento de drogas, en forma de gluconato de zinc (30 mg Zn / día), administrada diariamente por la mañana en ayunas durante 60 días. Las concentraciones en plasma y los eritrocitos de zinc se determinaron por espectrofotometría de absorción atómica de llama. La actividad de la superóxido dismutasa (SOD) se determinó por el método de eritrocitos in vitro utilizando el kit de Randox. Resultados y Discusión: La suplementación de zinc causó un aumento significativo en las concentraciones plasmáticas de mineral y mostró una reducción significativa en los eritrocitos, permaneciendo dentro de los límites normales. La actividad de SOD fue mayor en los pacientes de los grupos experimentales y de control, sin diferencias después de la suplementación. Conclusión: El estudio evidenció que la administración de suplementos de zinc mejora la condición homeostática del mineral, sin ningún cambio en la actividad de SOD, como un marcador de estrés oxidativo en pacientes con colitis ulcerosa (AU)

Estado nutricional relativo ao ferro e zinco de mães de recém-nascidos de risco / Nutritional status of iron and zinc in mothers of medium risk newborns

Objetivo: O presente estudo avaliou o estado nutricional relativo ao ferro e zinco em m�es de beb�s de risco. M�todos: Foi conduzido em 125 mulheres, que se encontravam no per�odo puerperal, com tempo m�dio de 10,2 dias. O estado nutricional do ferro foi avaliado por meio das concentra��es de hemoglobina, pelo m�todo da cianometahemoglobina, e da ferritina, por ensaio imunoenzim�tico. O zinco foi determinado no plasma e nos eritr�citos, por espectrofotometria de absor��o at�mica. O consumo diet�tico para macronutrientes, ferro e zinco, foi analisado no programa Dietsys, vers�o 4.01. Para compara��o das m�dias, foi utilizado o teste T student, adotando- se 5% como n�vel de signific�ncia. Resultados: A m�dia de hemoglobina nas m�es foi de 10,03�2,31 g/dL. A mediana da ferritina encontrada foi de 38,29 ng/mL, variando de 3,49 a 413,09 ng/mL. A m�dia do zinco plasm�tico foi de 56,20�13,10 ?gZn/dL e, nos eritr�citos, de 49,56�16,48 ?gZn/gHb, sendo, nestes �ltimos, mais elevada nas m�es de beb�s a termo do que nas m�es de prematuros (p = 0,001). Quanto ao consumo alimentar, as m�dias di�rias para energia, zinco e ferro foram de 2043,05�889,64 kcal, 10,73�6,89 mg e 17,66�8,40 mg, respectivamente. O consumo abaixo do recomendado para o per�odo gestacional foi identificado em 56,0% e 73,6% das mulheres, em rela��o ao zinco e ferro, respectivamente. Conclus�es: As baixas concentra��es de hemoglobina encontradas nas pu�rperas n�o refletiram na idade gestacional e no peso ao nascer. As m�dias de zinco nos eritr�citos estavam dentro dos valores de normalidade, sendo mais elevadas nas m�es de rec�m-nascidos a termo do que nas m�es de prematuros.

Objective: The present study assessed the nutritional status of iron and zinc in mothers of infants at risk. Methods: The study was conducted on 125 women, who were in the postpartum period, with a mean of 10.2 days. The nutritional status of iron was evaluated by means of hemoglobin by the cyanmethemoglobin method and ferritin by enzyme immunoassay. Zinc was determined in plasma and erythrocytes by atomic absorption spectrophotometry. The dietary intake of macronutrients, iron and zinc was analyzed using the Dietsys program, version 4.01. The T student test, adopting a 5% significance level, was used for comparison of means. Results: The mean hemoglobin in mothers was 10.03 � 2.31 g / dL. The median ferritin was 38.29 ng / mL, ranging from 3.49 to 413.09 ng / ml. The means of zinc were 56.20 � 13.10 ?gZn / dL in plasma and 49.56 � 16.48 ?gZn / gHb in erythrocytes, with the latter being higher in mothers of term infants compared with mothers of preterm infants (p = 0.001). As for food intake, the daily averages for energy, zinc and iron were 2043.05 � 889.64 kcal, 10.73 � 6.89 mg, and 17.66 � 8.40 mg, respectively. Consumption below recommendations for pregnancy was identified in 56.0% and 73.6% of the women investigated for zinc and iron, respectively. Conclusions: The low hemoglobin concentrations found in the mothers assessed did not affect gestational age and birth weight. The mean of zinc in erythrocytes was within normal range, being higher in mothers of newborns at term than in mothers of preterm newborns.

Influence of cortisol on zinc metabolism in morbidly obese women / Influencia del cortisol sobre el metabolismo del zinc en mujeres obesas mórbidas

Introduction: The accumulation of visceral fat affects the metabolism of hormones and some nutrients, but these mechanisms remain unclear. Objective: To assess the influence of cortisol on the metabolism of zinc in morbidly obese women. Method: Cross-sectional, case-control study involving 80 women aged between 20 and 59 years. The participants were divided into two groups: experimental (morbidly obese, n = 40) and control (normal weight, n = 40). Zinc concentrations were determined by atomic absorption spectroscopy and serum and urinary cortisol by chemiluminescence method. Results: Zinc intake was significantly different between groups. Mean plasma zinc was lower in obese compared to control group. Mean values for erythrocyte zinc were 44.52 ± 7.84 μg/gHb and 40.17 ± 6.71 μg/gHb for obese and control groups, respectively. Urinary excretion of this mineral was higher in obese compared to control subjects (p < 0.05). Mean values for plasma cortisol were 9.58 ± 4.86 μg/dL for obese and 9.89 ± 5.61 μg/dL for control groups. Mean values for urinary cortisol were 163.00 ± 100.35 μg/dL and 109.71 ± 34.88 μg/dL for obese and control groups, respectively (p > 0.05). The correlation analysis between cortisol and zinc was not significant (p > 0.05). Conclusions: Obese patients have hypozincemia and high erythrocyte zinc levels. The correlation between zinc parameters and cortisol concentration showed no influence of this hormone on zinc metabolism (AU)

Introducción: El acumulo de grasa visceral compromete el metabolismo de hormonas y de algunos nutrientes, sin embargo, esos mecanismos aún no están esclarecidos. Objetivos: Evaluar la influencia del cortisol sobre el metabolismo del zinc en mujeres obesas mórbidas. Métodos: Estudio transversal, caso-control, envolviendo 80 mujeres, en la faja etaria entre 20 y 59 años. Las participantes fueron distribuidas en dos grupos: experimental (obesas mórbidas, n = 40) y control (eutróficas, n = 40). Las concentraciones de zinc fueron determinadas por espectrofotometría de absorción atómica y el cortisol sérico y urinario, por quimioluminiscencia. Resultados: La ingestión de zinc reveló diferencia significativa entre los grupos estudiados. Los valores medios de zinc plasmáticos fueron inferiores en las obesas cuando fueron comparadas al grupo control. El promedio de zinc eritrocítico fue de 44,52 ± 7,84 μg/gHb e de 40,17 ± 6,71 μg/gHb para las obesas y control, respectivamente. La excreción urinaria de este mineral fue superior en las obesas cuando comparadas al control (p < 0,05). Los valores medios del cortisol sérico fueron de 9,58 ± 4,86 μg/dL para las obesas y de 9,89 ± 5,61 μg/dL para el control. Las medias de cortisol urinario fueron de 163,00 ± 100,35 μg/dL e de 109,71 ± 34,88 μg/dL para obesas y control, respectivamente (p > 0,05). El análisis de correlación entre el cortisol y el zinc no fue significativo. Conclusiones: las pacientes obesas presentan hypozincemia y elevada concentración de zin eritrocítico. La correlación entre los parámetros de zinc y las concentraciones de cortisol no demuestran influencia de esta hormona sobre el metabolismo del mineral (AU)

Biochemical parameters of zinc and markers of oxidative stress in soccer players / Parâmetros Bioquímicos do Zinco e Marcadores do Estresse Oxidativo em Jogadores deFutebol

The high intensity physical exercise induces to excessive formation of oxygen reactive species as well as changes in the metabolism of antioxidant nutrients. The zinc, particularly, which is a cofactor of enzymes of antioxidant defense system, seems to have alterations in its metabolic behavior in athletes. This study evaluated the effect of physical exercise on biochemical parameters of zinc and oxidative stress biomarkers of soccer players. A transectional, analytical and experimental study was performed with 20 players from the youth team (basis category sub20) in the first division of the brazilian championship with age between 17 and 19 years, male gender. The analysis of zinc intake, plasmatic and erythrocyte zinc, the activity of superoxide dismutase enzyme, and the plasma malondialdehyde were carried out before and after the match. Players showed zinc intake superior to recommendation. The mean plasmatic zinc was 77.6 ± 9.9 μg/dl pre-match and 68.9 ± 8.2 μg/dl post-match (p<0.05). The mean of erythrocyte zinc did not show significant difference after exercise (p>0.05). The mean plasmatic malondialdehyde was 1.1 ± 0.3 nmol/ml, and 5.5 ± 1.4 nmol/ml pre and post–exercise, respectively (p<0.05). The activity of superoxide dismutase enzyme did not change after 48 hours of the soccer match (p>0.05). High performance athlets like soccer players, show a reduction in zinc concentration and an increase in the plasmatic malondialdehyde. Further investigations using other biomarkers of oxidative stress and/or of inflammation may better clarify the alterations in the metabolic behavior of antioxidant nutrients in soccer players.

O exercício físico de alta intensidade favorece a formação excessiva de espécies reativas de oxigênio assim como distúrbios no metabolismo de nutrientes antioxidantes. O zinco, em particular, que é cofator de enzimas do sistema de defesa antioxidante, parece sofrer alterações no seu comportamento metabólico em atletas. Este estudo avaliou o efeito do exercício físico sobre parâmetros bioquímicos do zinco e marcadores do estresse oxidativo em jogadores de futebol. Estudo transversal, analítico e experimental realizado com 20 jogadores de futebol do time de juniores (categoria de base sub-20) da primeira divisão do campeonato brasileiro com idade entre 17 e 19 anos, do gênero masculino. Foram realizadas análises da ingestão de zinco, zinco plasmático e eritrocitário, atividade da enzima superóxido dismutase e malondialdeído plasmático antes e após a partida. Os jogadores de futebol mostraram ingestão de zinco superior à recomendação. Os valores médios de zinco plasmático foram de 77,6 ± 9,9 μg/dL no período pré-partida e de 68,9 ± 8,2 μg/dL no pós-partida (p<0,05). A média de zinco eritrocitário não mostrou diferença significativa após o exercício (p>0,05). A média do malondialdeído plasmático nos jogadores de futebol foi 1,1 ± 0,3 nmoL/mL e 5,5 ± 1,4 nmoL/mL no pré e pós-exercício, respectivamente (p<0,05). A atividade da enzima superóxido dismutase não alterou após 48 horas da partida de futebol (p>0,05). Atletas de alto rendimento, como jogadores de futebol, apresentam aumento de malondialdeído no plasma e redução nas concentrações de zinco no plasma. Novas investigações utilizando outros biomarcadores do estresse oxidativo e/ou da inflamação podem melhor esclarecer as alterações no comportamento metabólico de nutrientes antioxidantes em jogadores de futebol.

Oxidative stress and immunological alteration in women with preeclampsia.

OBJECTIVES: To determine plasma concentrations of malondialdehyde (MDA) and of inflammatory markers in women with preeclampsia. METHODS: A case-control study was conducted on 50 preeclamptic and 50 healthy pregnant women. The concentrations of MDA were determined by the method of thiobarbituric acid reactive substances. Markers of inflammation were determined by the multiplex method. RESULTS: The concentrations of MDA did not differ between groups (p > 0.05) and the preeclampsia group had significantly higher IL-6, IL-10, TNF-α and IL-6/IL-10 ratio, compared to those with normal pregnancy. CONCLUSIONS: The MDA is a nonspecific marker for oxidative stress in preeclampsia, and the gestantes with preeclampsia have immune dysfunction.

Enzyme activity of superoxide dismutase and zincemia in women with preeclampsia / La actividad de la enzima superóxido dismutasa y zincemia en mujeres con preeclampsia

Introduction: Preeclampsia is a complex syndrome of unknown aetiologic origin. It is characterized by the clinical triad of hypertension, edema and protenuria. Current concepts of the genesis of preeclampsia include endothelial dysfunction and oxidative stress. Objective: This study assessed the relationship between the activity of superoxide dismutase, the zincemia and the preeclampsia. Methods: A case-control study was carried out with 94 women, age between 17 and 44 years, which were divided in two groups: women with preeclampsia (n = 44) and control group women with normal pregnancy (n = 50). The activity of superoxide dismutase enzyme was determined according to Ransod kit. Zinc concentrations in plasma and erythrocytes were determined using the flame atomic absorption spectrophotometry technique, both determined before delivery and during puerperium. Student's t-test and the paired t-test were used for statistical analysis, and significance was established at p < 0.05. Results: The study revealed plasma hypozincemia more pronounced in women with severe preeclampsia (p < 0.05). This behavior was not observed in eryth-rocytes, whose concentrations remained stable, before delivery and puerperium in women with preeclampsia and normal pregnancy. The antioxidant activity of the enzyme superoxide dismutase was found elevated in women with and without preeclampsia (p>0.05), with significant reduction in activity in the postpartum period (p < 0.05) in both groups studied (p>0.05). Conclusions: This study shows there are alterations in biochemical parameters of zinc in women with preeclampsia. The activity of superoxide dismutase shows that this marker cannot be used to predict the evolution of the disease (AU)

Introducción: La preeclampsia es un síndrome de origen desconocido del punto de vista etiológico. Se caracteriza clínicamente por una tríada de síntomas: edema, hipertensión y proteinuria. Los conceptos actuales sobre la patogénesis de la preeclampsia incluyen la disfunción endotelial y el estrés oxidativo. Objetivo: En este estudio se evaluó la relación entre la actividad de la superóxido dismutasa, zincemia y preeclampsia. Métodos: Este estudio de casos y controles se llevó a cabo con 94 mujeres, con un rango de edad situado entre 17 y 44 años, los que fueron divididos en dos grupos: mujeres con preeclampsia (n = 44) y grupo control, las mujeres con embarazo normal (n = 50). La actividad de la superóxido dismutasa se llevó a cabo según el kit Ransod. Las concentraciones de zinc en plasma y los eritrocitos fue realizada según el metodo de espectrofotometría de absorción atómica de llama, ambos determinados antes del nacimiento y después del parto. La prueba de la t de Student y la prueba t pareada fue utilizada para el análisis estadístico (p < 0,05). Resultados: El estudio reveló hypozincemia en el plasma, con valores más altos en las mujeres con preeclampsia severa (p < 0,05). Esta situación no fue observada en los eritrocitos, cuya concentración se mantuvo estable antes del parto y en el puerperio, en las mujeres con preeclampsia y en las con embarazo normal. La actividad antioxidante de la superóxido dismutasa, se encontró elevada en las mujeres con y sin preeclampsia (p > 0,05), con una reducción significativa en la actividad en el periodo postparto (p < 0,05) en ambos grupos (p > 0,05). Conclusiones: Este estudio revelló que hay cambios en los parámetros bioquímicos de zinc en mujeres con preeclampsia. La actividad de la superóxido dismutasa se revelló que este marcador no se puede utilizar para predecir la progresión de la enfermedad (AU)