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1.
J Nutr ; 151(8): 2161-2174, 2021 08 07.
Artigo em Inglês | MEDLINE | ID: mdl-34036357

RESUMO

BACKGROUND: Dairy consumption reduces postprandial glycemia and appetite when consumed with carbohydrates. OBJECTIVES: The objective was to test the effects of frequently consumed dairy products, age, and sex on glycemia, appetite, and food intake. METHODS: In a randomized, unblinded, crossover design, 30 older [60-70 y; BMI (kg/m2): 18.5-29.9] and 28 young (20-30 y; BMI: 18.5-24.9) adults consumed 500 mL of a calorie-free control (water), skim milk and whole milk, 350 g Greek yogurt, and 60 g cheddar cheese. Food intake at an ad libitum meal was measured 120 min later. Glycemia, appetite, and gastric hormone responses were measured premeal (15-120 min), within-meal (120-140 min), and postmeal (140-170 min). Effects of treatment, age, and sex and their interactions were analyzed using ANOVA followed by Tukey's post hoc test. RESULTS: All forms of dairy, compared with water, decreased postmeal glycemia, premeal appetite, and meal intake (P < 0.0001). Premeal glucose, insulin, and glucagon-like peptide 1 increased, and ghrelin decreased, but effects of dairy differed with age and sex. Older adults had 10% higher pre- and postmeal glucose (P < 0.01). Premeal appetite suppression per 100 kcal of treatments was more after yogurt than other dairy, but overall appetite suppression was less in older adults than in young adults and in males than in females (P < 0.05). Pizza intake was reduced by 175 kcal after yogurt and cheese and by 82 kcal after milks compared to water (P < 0.001). Mealtime reduction for treatment calories averaged 62% after yogurt and cheese but was less at 33% after milks (P < 0.05). Compensation was less in older (33%) than in young (63%) adults (P < 0.03). CONCLUSIONS: Dairy products consumed in usual forms before a meal stimulate metabolic responses leading to reduced premeal appetite, later food intake, and postmeal glycemia, but their effects differ in magnitude and with the sex and age of adults.


Assuntos
Glicemia , Período Pós-Prandial , Adulto , Idoso , Animais , Apetite , Índice de Massa Corporal , Estudos Cross-Over , Ingestão de Alimentos , Ingestão de Energia , Feminino , Humanos , Insulina , Masculino , Refeições , Pessoa de Meia-Idade , Leite , Adulto Jovem
2.
J Nutr ; 150(12): 3103-3113, 2020 12 10.
Artigo em Inglês | MEDLINE | ID: mdl-33024990

RESUMO

BACKGROUND: Increasing the total protein content and reducing the casein to whey ratio in milks consumed with breakfast cereal reduce postprandial blood glucose (BG). OBJECTIVES: We aimed to explore associations between plasma amino acids (AAs), BG, and glucoregulatory hormones. METHODS: In this repeated-measures design, 12 healthy adults consumed cereal (58 g) and milks (250 mL) with 3.1 wt% or high 9.3 wt% protein concentrations and with casein to whey ratios of either 80:20 or 40:60. Blood was collected at 0, 30, 60, 120, 140, 170, and 200 min for measurement of the primary outcome, BG, and for the exploratory outcomes such as plasma AA, gastric emptying, insulin (INS), and glucoregulatory hormones. Measures were made prior to and after an ad libitum lunch at 120 min. Exploratory correlations were conducted to determine associations between outcomes. RESULTS: Pre-lunch plasma AA groups [total (TAA), essential (EAA), BCAA, and nonessential (NEAA)] were higher after 9.3 wt% than 3.1 wt% milks by 12.7%, 21.4%, 20.9%, and 7.6%, respectively (P ≤ 0.05), while post-lunch AA groups were higher by 10.9%, 19.8%, 18.8%, and 6.0%, respectively (P ≤ 0.05). Except for NEAA, pre-lunch AAs were higher after 40:60 than 80:20 ratio milks by 4.5%, 8.3%, and 9.3% (P ≤ 0.05). When pooled by all treatments, pre-lunch AA groups associated negatively with BG (r/ρ ≥ -0.45, P ≤ 0.05), but post-lunch only TAA and NEAA correlated (r ≥ -0.37, P < 0.05). Pre-lunch BG was inversely associated with Leu, Ile, Lys, Met, Thr, Cys-Cys, Asn, and Gln (r/ρ ≥ -0.46, P ≤ 0.05), but post-lunch, only with Thr, Ala, and Gly (r ≥ -0.50, P ≤ 0.05). Pre-lunch associations between AA groups and INS were not found. CONCLUSIONS: Protein concentration and the ratio of casein to whey in milks consumed at breakfast with cereal affect plasma AA concentrations and their associations with decreased BG. The decrease in BG could be explained by INS-independent mechanisms. This trial was registered at www.clinicaltrials.gov as NCT02471092.


Assuntos
Aminoácidos/sangue , Glicemia/efeitos dos fármacos , Caseínas/química , Leite/química , Soro do Leite/química , Animais , Desjejum , Estudos Cross-Over , Grão Comestível , Feminino , Humanos , Masculino , Adulto Jovem
3.
Int J Hyperthermia ; 36(1): 625-631, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31223048

RESUMO

Objective: Hot environments are associated with impaired glucose metabolism at rest in healthy humans. The purpose of this study was to explore the contribution of key glucoregulatory hormones and biomarkers to this altered glucose tolerance. Methods: The effects of ambient temperature on glucose tolerance and its determinants were assessed with a 3-hr oral glucose tolerance test (OGTT) administered to 19 healthy young men and women at 22 °C and 31 °C. Results: The glucose response amplitude was greater in warm environment (AUC 904 ± 151 vs. 721 ± 89 mmol/l·180 min at 31 °C and 22 °C, respectively, p < .001). There was no significant effect of environmental temperature on insulin, growth hormone or pancreatic polypeptide concentrations (all p > .17). The cortisol response to the glucose load was reduced 30, 60, 90 and 120 minutes postload at 31 °C compared with 22 °C (p = .001). The interleukin-6 concentration was also lower in the session at 31 °C (p = .043). Conclusion: We conclude that the effects of environmental temperature on the glucoregulatory hormones and biomarkers reported in this study do not explain the exaggerated increase in blood glucose after a glucose load taken in a warm environmental temperature. Precis statement: This work demonstrates in healthy men and women that the ingestion of glucose elicits an exaggerated increase in blood glucose when the environmental temperature is warm.


Assuntos
Teste de Tolerância a Glucose/métodos , Metabolismo/fisiologia , Administração Oral , Adulto , Feminino , Humanos , Masculino , Temperatura , Adulto Jovem
4.
J Dairy Sci ; 102(8): 6766-6780, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31229285

RESUMO

This study describes the effects on glycemic response and the underlying mechanisms of action of increasing the protein concentration and decreasing the casein-to-whey ratio in milk when consumed with a high glycemic breakfast cereal. Twelve healthy men and women, aged 18 to 30 yr and with a body mass index of 20 to 24.9 kg/m2, consumed (in random order) milk beverages (250 mL) containing either 3.1 or 9.3% protein and casein-to-whey ratios of either 80:20 or 40:60. We measured postprandial appetite, glucose, regulatory hormones, and stomach emptying rate over 200 min, as well as food intake at an ad libitum meal at 120 min. Although pre-meal appetite was suppressed to a greater extent with milk beverages that had high (9.3%) compared with regular (3.1%) protein content, food intake was similar among all 4 treatments. Pre-meal mean blood glucose was lower with beverages that had high rather than regular milk protein content, with the lowest glucose peaks after the high milk protein treatment with the 40:60 casein-to-whey ratio. Pre-meal insulin and C-peptide levels were not affected by milk protein content or casein-to-whey ratio, but pre-meal glucagon-like peptide 1 was higher after the treatment containing high milk protein and the 40:60 casein-to-whey ratio, and pre-meal cholecystokinin was higher after the treatments containing high milk protein content. Plasma paracetamol response was also lower after the treatments containing high compared with regular milk protein content. When consumed with carbohydrate, milk beverages with high protein content and (to a lesser extent) a decreased casein-to-whey ratio lowered postprandial glycemia through insulin-independent mechanisms, primarily associated with delayed stomach emptying.


Assuntos
Glicemia/análise , Desjejum , Caseínas/análise , Proteínas do Leite/análise , Leite/química , Período Pós-Prandial , Adolescente , Adulto , Animais , Apetite , Ingestão de Alimentos , Grão Comestível , Feminino , Esvaziamento Gástrico , Peptídeo 1 Semelhante ao Glucagon/sangue , Humanos , Insulina/sangue , Masculino , Soro do Leite/química , Proteínas do Soro do Leite/análise , Adulto Jovem
5.
Curr Opin Lipidol ; 24(3): 207-13, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23619369

RESUMO

PURPOSE OF REVIEW: There is growing interest in defining the dietary approaches for the management of lipid disorders. This review focuses on dietary proteins. RECENT FINDINGS: Increasing protein intake was coupled with improved lipid profiles in humans and animals. However, most studies increased the protein content by reducing that of fat or carbohydrate or both, making unclear the role of protein alone. Mechanisms of action differ with the sources of proteins, because of amino acid composition and bioactive peptides encrypted in their sequences. Soy protein was investigated the most, and many studies show that its consumption reduces blood cholesterol. The role of other constituents including isoflavones is debated. Short-term studies are consistent in showing lipid-lowering properties of whey proteins, attributed to their relative high content in branched chain amino acids. A limited number of studies, the majority being on animals, have shown hypocholesterolemic activities of fish proteins. SUMMARY: Dietary proteins regulate lipid metabolism in a manner dependent on their quantity and composition. There is a general consensus that proteins slow lipid absorption and synthesis, and promote lipid excretion. The benefits of dietary proteins remain to be confirmed in individuals with lipid abnormalities, for formulation of optimal dietary alternatives for the management of lipid disturbances.


Assuntos
Anticolesterolemiantes/metabolismo , Proteínas Alimentares/metabolismo , Hipercolesterolemia/metabolismo , Metabolismo dos Lipídeos/efeitos dos fármacos , Obesidade/metabolismo , Aminoácidos/química , Aminoácidos/metabolismo , Animais , Anticolesterolemiantes/farmacologia , Dieta , Proteínas Alimentares/farmacologia , Proteínas de Peixes/metabolismo , Proteínas de Peixes/farmacologia , Humanos , Hipercolesterolemia/prevenção & controle , Isoflavonas/metabolismo , Isoflavonas/farmacologia , Lipoproteínas/metabolismo , Proteínas do Leite/metabolismo , Proteínas do Leite/farmacologia , Obesidade/prevenção & controle , Proteínas de Soja/metabolismo , Proteínas de Soja/farmacologia , Proteínas do Soro do Leite
6.
Appetite ; 65: 75-82, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23402713

RESUMO

The objective was to compare the effects of ad libitum consumption of commonly consumed meal-time beverages on energy and fluid intakes and post-meal average subjective appetite and blood glucose in healthy adults. In a randomized controlled design, 29 males and females consumed to satiation an ad libitum pizza meal with one of five beverages in unlimited amount including water (0 kcal), 1% milk (44 kcal/100 ml), regular cola (44 kcal/100 ml), orange juice (44 kcal/100 ml) and diet cola (0 kcal). Food and fluid intakes were measured at the meal. Average subjective appetite and blood glucose were measured before and for 2h after the meal. Although energy intake from pizza was similar among all beverage treatments, the amount of fluid consumed (g) varied among the beverages with intake of orange juice higher than regular and diet cola, but not different from water or milk. Meal-time ingestion of caloric beverages, milk, orange juice and regular cola, led to higher total meal-time energy intakes compared to either water or diet cola. Post-meal blood glucose area under the curve (AUC) was lower after milk than after meals with water, orange juice and regular cola and post-meal average subjective appetite AUC was lower after milk than after meals with water. Meal intakes of nutrients including protein, calcium, phosphorus, zinc, vitamins B12, A and D were higher at the meal with milk compared to the other beverages. Thus, caloric beverages consumed ad libitum during a meal add to total meal-time energy intake, but 1% milk favors a lower post-meal blood glucose and average subjective appetite score and adds to nutrient intake.


Assuntos
Apetite , Bebidas , Glicemia/metabolismo , Dieta , Ingestão de Líquidos , Ingestão de Energia , Refeições , Adulto , Animais , Área Sob a Curva , Bebidas Gaseificadas , Citrus sinensis , Gorduras na Dieta/administração & dosagem , Comportamento Alimentar , Feminino , Humanos , Masculino , Micronutrientes/administração & dosagem , Leite , Preparações de Plantas , Água , Adulto Jovem
7.
Appetite ; 60(1): 154-161, 2013 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-23022554

RESUMO

The objective was to compare the effects of pre-meal consumption of familiar beverages on appetite, food intake, and glycemic response in healthy young adults. Two short-term experiments compared the effect of consumption at 30 (experiment 1) or 120 min (experiment 2) before a pizza meal of isovolumetric amounts (500 mL) of water (0 kcal), soy beverage (200 kcal), 2% milk (260 kcal), 1% chocolate milk (340 kcal), orange juice (229 kcal) and cow's milk-based infant formula (368 kcal) on food intake and subjective appetite and blood glucose before and after a meal. Pre-meal ingestion of chocolate milk and infant formula reduced food intake compared to water at 30 min, however, beverage type did not affect food intake at 2h. Pre-meal blood glucose was higher after chocolate milk than other caloric beverages from 0 to 30 min (experiment 1), and after chocolate milk and orange juice from 0 to 120 min (experiment 2). Only milk reduced post-meal blood glucose in both experiments, suggesting that its effects were independent of meal-time energy intake. Combined pre- and post-meal blood glucose was lower after milk compared to chocolate milk and orange juice, but did not differ from other beverages. Thus, beverage calorie content and inter-meal intervals are primary determinants of food intake in the short-term, but macronutrient composition, especially protein content and composition, may play the greater role in glycemic control.


Assuntos
Apetite/efeitos dos fármacos , Bebidas , Glicemia/análise , Carboidratos da Dieta/administração & dosagem , Proteínas Alimentares/administração & dosagem , Ingestão de Energia , Animais , Regulação do Apetite , Índice de Massa Corporal , Cacau , Citrus sinensis , Ingestão de Líquidos , Feminino , Humanos , Fórmulas Infantis , Masculino , Refeições , Leite , Valor Nutritivo , Leite de Soja , Inquéritos e Questionários , Adulto Jovem
8.
Nutrients ; 15(19)2023 Sep 27.
Artigo em Inglês | MEDLINE | ID: mdl-37836454

RESUMO

The range of gluten-free food products available to consumers is steadily expanding. In recent years, recalls of food products have highlighted the importance of accurate labeling of food products for the presence of wheat, other gluten-containing cereals, or gluten itself as refined ingredient. The purpose of this study was to gain more insights into recent food recalls related to undeclared gluten/wheat contamination and consumer experiences with these recalls. Recalls of products triggered by gluten contamination are relatively scarce and are not often triggered by a consumer complaint. The impact of these recalls on consumer trust was evaluated through an online survey that was distributed among supporters of Celiac Canada (CCA) and covered (i) strategies to adhere to a gluten-free diet, (ii) experiences with gluten-free recalls and their impact on consumer trust, and (iii) demographic information. Consumer concern regarding gluten-free product recalls is significant, but the concern regarding recalls is not heightened after experiencing a recall. Companies pursuing transparency in the process, identification of the source of contamination, and mitigation strategies going forward are likely to retain consumer trust in their product and brand. Based on the survey results, further efforts focusing on consumer education regarding interpreting nutrient labels, identifying sources of information on product recalls, and understanding procedures to follow upon suspected gluten contamination of a gluten-free product are recommended.


Assuntos
Doença Celíaca , Dieta Livre de Glúten , Humanos , Rotulagem de Alimentos , Confiança , Glutens , Recall e Retirada de Produto
9.
J Am Coll Health ; 71(6): 1957-1965, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-34398710

RESUMO

OBJECTIVE: The purpose of this study was to identify the psychosocial determinants of (1) intention to use dietary supplements (DS) and (2) the behavior of engaging in supplementation by testing the fit of the Theory of Planned Behavior (TPB). METHODS: A total of 778 students at a Canadian university in Ontario completed a cross-sectional survey assessing participants' attitude, injunctive norm, descriptive norm, perceived behavioral control and intention toward DS use. Data were analyzed using independent sample t-tests and linear and logistic regressions. RESULTS: Attitude, injunctive norm and perceived behavioral control were significant predictors of intention to use DS. Attitude, injunctive norm and intention were significant predictors of engaging in supplementation. The model explained 75.5% of the variance and correctly classified 89.6% of cases. The odds of using DS doubled with every one-unit increase in intention. CONCLUSIONS: This study confirms the utility of the TPB in predicting university students' supplementation habits.

10.
Nutrients ; 15(4)2023 Feb 09.
Artigo em Inglês | MEDLINE | ID: mdl-36839238

RESUMO

Dietary supplements are widely used among athletes, but many may be unaware of the potential for unintentional doping, especially considering that supplements can often be contaminated with prohibited substances. The reason behind the widespread use of dietary supplements among athletes is often cited as being for the purposes of enhancing health or performance. However, many athletes turn to unreliable sources of information, and often lack knowledge of dietary supplement regulations. The aim of this narrative review is to explore the current research surrounding the psychological constructs (such as norms, attitudes, and beliefs) related to dietary supplement use among athletes that may lead to inadvertent doping. This review also covers possible programme structures that may be effective at preventing inadvertent doping.


Assuntos
Dopagem Esportivo , Humanos , Dopagem Esportivo/psicologia , Atletas/psicologia , Atitude , Suplementos Nutricionais
11.
Nutrients ; 14(19)2022 Oct 03.
Artigo em Inglês | MEDLINE | ID: mdl-36235761

RESUMO

Athletes represent a major part of dietary supplement users. This scoping review aims to explore the prevalence of dietary supplement use among athletes worldwide, most commonly used supplements, sources of information on dietary supplements and their reasons for use of these supplements. PubMed, CINAHL, MEDLINE, and PsycInfo were searched for original research articles. Studies were included if they involved athletes, identified the prevalence of dietary supplement use, and were published after 2017. A total of 26 articles were reviewed. Prevalence of dietary supplement use varied among articles, but sex-based differences related to the types of used dietary supplements existed. Generally, the findings were consistent in terms of reasons for use and sources of information. Unfortunately, the lack of homogeneity regarding the definition of dietary supplements, definition of use, reporting timeframes, and data collection methods complicates the attempt to compare the findings among studies.


Assuntos
Atletas , Suplementos Nutricionais , Humanos , Prevalência
12.
Nurse Pract ; 46(2): 19-26, 2021 02 01.
Artigo em Inglês | MEDLINE | ID: mdl-33399334

RESUMO

ABSTRACT: Nonalcoholic fatty liver disease (NAFLD), a multisystem, prevalent liver disease, can be managed with lifestyle interventions, including diet, given the lack of well-established pharmacologic therapies. This review explores the different dietary approaches that have been found effective in the management of NAFLD, offering a unique resource to healthcare professionals.


Assuntos
Hepatopatia Gordurosa não Alcoólica , Dieta , Humanos , Estilo de Vida , Hepatopatia Gordurosa não Alcoólica/epidemiologia , Hepatopatia Gordurosa não Alcoólica/terapia
13.
Nutrients ; 13(11)2021 Nov 03.
Artigo em Inglês | MEDLINE | ID: mdl-34836190

RESUMO

The misuse of dietary supplements and doping substances is commonly associated with toxicity, nutritional imbalances, and health and psychological consequences. This is alarming especially in light of the increasing prevalence of the use of dietary supplements and doping, particularly among young adults including athletes. There is evidence that education interventions can lead to improved knowledge, intentions, and practices. However, no review has summarized and evaluated the effectiveness of such interventions. The aim of this article is to review the characteristics, contents and effects of education interventions that were designed and implemented to improve knowledge, attitudes, beliefs and intentions with respect to the use of dietary supplements and doping agents in different populations. PubMed, Scopus, CINAHL, PsycInfo and Google Scholar were searched for English-language education interventions targeting dietary supplements and doping substances. A total of 20 articles were identified and have generally provided consistent findings. Most interventions reported a significant improvement in knowledge on dietary supplements and doping agents. Unfortunately, the heavy reliance on self-reported assessment tools limits the validity of these interventions, with almost all articles targeting athletes and adolescents.


Assuntos
Suplementos Nutricionais , Dopagem Esportivo/métodos , Educação em Saúde/métodos , Conhecimentos, Atitudes e Prática em Saúde , Substâncias para Melhoria do Desempenho/uso terapêutico , Adolescente , Adulto , Atletas/psicologia , Criança , Dopagem Esportivo/psicologia , Feminino , Humanos , Intenção , Masculino , Substâncias para Melhoria do Desempenho/efeitos adversos , Adulto Jovem
14.
J Diet Suppl ; 18(6): 614-629, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-32990098

RESUMO

BACKGROUND: Given the risks of inadvertent doping associated with dietary supplement (DS) use, it is critical to explore the extent of dependence of varsity athletes on DS to improve performance and support recovery. The purpose of this study was to gain insight into dietary supplementation practices among varsity athletes in a university setting in Ontario, Canada. METHODS: An online DS use questionnaire was completed by 302 varsity athletes (30.5% male, 69.5% female; 20.5 ± 1.8-year old) who were competing in intermittent, power and endurance-based sports at the University of Guelph. The data from supplement users were analyzed using a Chi-square analysis to investigate type of DS consumption, frequency of use and reasons for use. RESULTS: Overall, 58.3% of athletes reported having used at least one type of DS in the past six months. Gender and age had significant associations with prevalence of DS use, with male athletes and athletes over 20-year old being more likely to be DS users. The most frequently reported reasons for consuming DS were to maintain good health, increase energy, promote recovery, correct or prevent micronutrient deficiencies and supply convenient forms of energy and/or macronutrients. Although, most athletes were using reliable sources of information, health care professionals, 58.6% still mentioned wanting to become more knowledgeable about DS. CONCLUSIONS: Findings from this study may guide the development of educational materials needed to address knowledge gaps on DS among varsity athletes.


Assuntos
Esportes , Universidades , Adolescente , Adulto , Atletas , Canadá , Suplementos Nutricionais , Feminino , Humanos , Masculino , Adulto Jovem
15.
Eur J Nutr ; 49(8): 493-500, 2010 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-20396896

RESUMO

PURPOSE: This study was conducted to investigate whether a higher proportion of protein or fat is more favorable for optimal ghrelin and peptide YY (PYY) release in subjects consuming low carbohydrate meals. METHODS: Eight normal weight men received, on three separate occasions, high protein low fat (HPLF) (40% protein, 25% fat), low protein high fat (LPHF) (10% protein, 55% fat) or medium protein medium fat (MPMF) (25% protein, 40% fat) meals, with equal low carbohydrates content in all three meals (35% of energy). Postprandial blood samples were collected before and 15, 30, 60, 120, 180 and 240 min following the ingestion of each meal. Plasma acylated ghrelin and PYY(3-36) as well as serum insulin, glucose and triglycerides were measured. RESULTS: Comparing meals and considering each time point separately, a trend for a statistically significant difference in acylated ghrelin was observed between HPLF and LPHF meals and a statistically significant change of PYY from baseline was noted between HPLF and LPHF meals as compared to the MPMF meal at certain time points. When data were pooled together, a statistically significant difference in acylated ghrelin change from baseline was observed between HPLF and LPHF meals, while both HPLF and LPHF meals resulted in a significantly higher PYY(3-36) release in comparison to MPMF meal. AUC data analysis for PYY(3-36) revealed significantly higher values following HPLF in comparison to MPMF meal. Correlation analysis revealed a significant negative correlation between acylated ghrelin and insulin only with the HPLF meal. Postprandial glucose and triglyceride levels were not significantly different between the three meals. CONCLUSIONS: In subjects consuming low carbohydrate meals, higher concentrations of proteins to fat seem to have more favorable effects on postprandial appetite hormones.


Assuntos
Dieta com Restrição de Carboidratos , Gorduras na Dieta/administração & dosagem , Proteínas Alimentares/administração & dosagem , Grelina/sangue , Peptídeo YY/sangue , Adulto , Apetite , Área Sob a Curva , Biomarcadores/sangue , Glicemia/metabolismo , Índice de Massa Corporal , Grelina/metabolismo , Humanos , Insulina/sangue , Líbano , Masculino , Peptídeo YY/metabolismo , Período Pós-Prandial , Triglicerídeos/sangue , Adulto Jovem
16.
Ann Nutr Metab ; 57(1): 59-67, 2010.
Artigo em Inglês | MEDLINE | ID: mdl-20714138

RESUMO

AIMS: The aim of this study was to investigate the appetite hormones and metabolic responses of hyperinsulinemic subjects to high-protein (HP) meals as compared to high-carbohydrate (HC) and high-fat (HF) meals. DESIGN: Fifteen hyperinsulinemic normoglycemic men received, on 3 separate occasions, HP, HC, or HF meals in a randomized crossover design. Blood samples were collected before and after the ingestion of each meal. Postprandially, acylated ghrelin, PYY(3-36), insulin, glucose, and triglycerides were measured. RESULTS: While the HC meal induced an acutely greater postprandial ghrelin decrease below baseline, the HP meal maintained this decline significantly more than the HF meal at 240 min. Postprandial PYY(3-36) responses did not significantly vary with time and meal composition. Postprandial insulin and glucose peaks were significantly lower following the HP and HF meals in comparison to the HC meal, whereas triglyceride responses were significantly higher following the HF meal. Significant correlations, negative between acylated ghrelin and insulin and positive between PYY(3-36) and insulin, were observed. CONCLUSIONS: In hyperinsulinemic normoglycemic men, HP meals ensure a longer-lasting suppression of circulating ghrelin levels and result in more favorable metabolic responses, characterized by a lower surge of postprandial insulin and glucose and a reduced postprandial triglyceride response, as compared to both HC and HF meals.


Assuntos
Regulação do Apetite , Proteínas Alimentares/administração & dosagem , Grelina/sangue , Hiperinsulinismo/dietoterapia , Insulina/sangue , Peptídeo YY/sangue , Adolescente , Adulto , Glicemia , Carboidratos da Dieta/administração & dosagem , Gorduras na Dieta/administração & dosagem , Humanos , Masculino , Obesidade/metabolismo , Período Pós-Prandial/fisiologia , Triglicerídeos/sangue , Adulto Jovem
17.
Nutrients ; 12(8)2020 Jul 30.
Artigo em Inglês | MEDLINE | ID: mdl-32751521

RESUMO

Despite the emerging evidence of adverse consequences and interaction with doping substances, dietary supplements (DS) are commonly used by many Canadians. The purpose of this study was to evaluate the patterns and determinants of current DS use among non-athlete students at a Canadian university using a cross-sectional approach. Of the 475 participants who completed the online survey, 43.4% declared using DS in the past six months. Participants who were male, aged ≥20 years old, and had a parent/guardian with a bachelor's degree were significantly more likely to use DS. The types of DS used and the sources of information regarding DS were significantly influenced by age and gender. The most commonly used DS were vitamin and mineral and protein supplements. Most participants referred to healthcare professionals for information on DS, but many continued to depend on unreliable sources including family and friends. Of DS users, 10.1% reported experiencing adverse events from using DS. Findings from this study indicate that supplementation is very common among Canadian non-athlete students and highlight the urgent need for the development of educational programs surrounding DS use.


Assuntos
Suplementos Nutricionais/estatística & dados numéricos , Estudantes/estatística & dados numéricos , Adulto , Fatores Etários , Canadá , Estudos Transversais , Feminino , Humanos , Masculino , Fatores Sexuais , Universidades , Adulto Jovem
18.
Sports (Basel) ; 7(7)2019 Jul 06.
Artigo em Inglês | MEDLINE | ID: mdl-31284611

RESUMO

BACKGROUND: The purpose of this study is to develop and test the validity and reliability of a questionnaire to evaluate dietary supplement use based on the Theory of Planned Behaviour (TPB). METHODS: The questionnaire has sections on demographics, physical activity, dietary supplements, and cognitive constructs based on the TPB. Three stages are followed. In Stage 1, elicitation interviews are conducted on five varsity athletes, five physically active non-athletes, and five physically inactive University of Guelph (UofG) students. In Stage 2, comments and ratings of the TPB-based statements are gathered from 10 subject matter experts to check for content validity. In Stage 3, Cronbach's α is calculated to determine the internal consistency of the cognitive constructs by a pilot test on 84 Applied Human Nutrition UofG students. RESULTS: Interviews assisted in the formulation of the cognitive constructs' statements, including intentions, attitudes, injunctive norms, descriptive norms, and perceived behavioural control. Content validity ensured that these constructs did not overlap. Few statements from the cognitive constructs were omitted based on findings from the reliability test, achieving acceptable Cronbach's α values across all constructs (≥0.70). CONCLUSIONS: This supplement use questionnaire will be used in a future study to investigate the use and determinants of dietary supplements among Canadian athlete and non-athlete UofG students.

19.
Nutrients ; 10(10)2018 Oct 02.
Artigo em Inglês | MEDLINE | ID: mdl-30279384

RESUMO

Consumers, food manufacturers and health professionals are uniquely influenced by the growing popularity of the gluten-free diet. Consumer expectations have urged the food industry to continuously adjust and improve the formulations and processing techniques used in gluten-free product manufacturing. Health experts have been interested in the nutritional adequacy of the diet, as well as its effectiveness in managing gluten-related disorders and other conditions. In this review, we aim to provide a clear picture of the current motivations behind the use of gluten-free diets, as well as the technological and nutritional challenges of the diet as a whole. Alternative starches and flours, hydrocolloids, and fiber sources were found to play a complex role in mimicking the functional and sensory effects of gluten in gluten-free products. However, the quality of gluten-free alternatives is often still inferior to the gluten-containing products. Furthermore, the gluten-free diet has demonstrated benefits in managing some gluten-related disorders, though nutritional imbalances have been reported. As there is limited evidence supporting the use of the gluten-free diet beyond its role in managing gluten-related disorders, consumers are urged to be mindful of the sensorial limitations and nutritional inadequacies of the diet despite ongoing strategies to improve them.


Assuntos
Doença Celíaca/dietoterapia , Dieta Livre de Glúten , Fibras na Dieta/análise , Farinha/análise , Glutens , Humanos , Estado Nutricional , Valor Nutritivo
20.
Appl Physiol Nutr Metab ; 42(3): 302-310, 2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-28177745

RESUMO

The effect of beverages commonly consumed by children in-between or with meals on short-term food intake (FI) and glycemic control has received little attention. Therefore, 2 experiments were conducted in 9- to 14-year-old children following a randomized repeated-measures design. Experiment 1 (n = 32) compared the effects of water (control) and isocaloric (130 kcal) amounts of 2% milk, chocolate milk, yogurt drink, and fruit punch on subjective appetite and FI. Experiment 2 (n = 20) compared the effects of isocaloric (130 kcal) amounts of 2% milk and fruit punch on subjective appetite, FI, and glycemic and appetite hormone responses. One serving of the beverages was given as a pre-meal drink at baseline (0 min) and a second serving 60 min later with an ad libitum pizza meal. Meal FI in experiment 1 was lower by 14% and 10%, respectively, after chocolate milk and yogurt drink (p < 0.001), but not milk, compared with water. Cumulative energy intake (beverages plus meal) was higher after caloric beverages than water. In experiment 2, no differences occurred in pre-meal but post-meal glucose was 83% higher in overweight/obese than normal-weight children (p = 0.02). Milk led to higher pre-meal glucagon-like peptide-1 and post-meal peptide tyrosine tyrosine (PYY) than fruit punch (p < 0.01) but insulin did not differ between treatments. In conclusion, dairy products consumed before and with a meal have more favourable effects on FI, appetite, and satiety hormones than a sugar-sweetened beverage, but all caloric beverages result in more cumulative calories than if water is the beverage.


Assuntos
Apetite/fisiologia , Glicemia/metabolismo , Laticínios , Ingestão de Alimentos/fisiologia , Ingestão de Energia , Refeições , Adolescente , Índice de Massa Corporal , Peso Corporal , Criança , Carboidratos da Dieta/administração & dosagem , Proteínas Alimentares/administração & dosagem , Feminino , Sucos de Frutas e Vegetais , Grelina/sangue , Peptídeo 1 Semelhante ao Glucagon/sangue , Humanos , Insulina/sangue , Masculino , Adoçantes Calóricos/administração & dosagem , Peptídeo YY/sangue , Saciação
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