Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 41
Filtrar
Mais filtros

Bases de dados
Tipo de documento
Intervalo de ano de publicação
1.
J Nutr ; 150(2): 195-201, 2020 02 01.
Artigo em Inglês | MEDLINE | ID: mdl-31724705

RESUMO

The FAO of the UN convened an Expert Working Group meeting to provide recommendations related to protein quality evaluation of Follow-up Formula for Young Children (FUF-YC) and Ready-to-Use Therapeutic Foods (RUTFs). The protein and amino acid (AA) scoring patterns for the target age groups were defined and recommendations provided on the use of currently available protein and indispensable AA digestibility data. For FUF-YC, an age category of 1-2.9 y was identified, and a matching protein requirement of 0.86 g · kg-1 · d-1 with corresponding AA requirements were recommended. For RUTF, the protein requirement recommended was 2.82 g · kg-1 · d-1, to achieve a catch-up weight gain of 10 g · kg-1 · d-1 in children recovering from severe acute malnutrition. The AA requirements were factorially derived based on the adult protein requirement for maintenance and tissue AA composition. A flowchart was proposed for the best available methods to estimate digestibility coefficients (of either protein or AAs), in the following order: human, growing pig, and rat true ileal AA digestibility values. Where this is not possible, fecal protein digestibility values should be used. The Expert Working Group recommends the use of the Protein Digestibility Corrected Amino Acid Score (PDCAAS), with existing protein digestibility values, or the Digestible Indispensable Amino Acid Score provided that individual AA digestibility values are available for protein quality evaluation using the latter score. The Group also recommends the use of ileal digestibility of protein or of AAs for plant-based protein sources, recognizing the possible effects of antinutritional factors and impaired gut function. A PDCAAS score of ≥90% can be considered adequate for these formulations, whereas with a score <90%, the quantity of protein should be increased to meet the requirements. Regardless of the protein quality score, the ability of formulations to support growth in the target population should be evaluated. Future research recommendations are also proposed based on the knowledge gaps identified.


Assuntos
Proteínas Alimentares/normas , Alimento Funcional , Fórmulas Infantis , Animais , Pré-Escolar , Proteínas Alimentares/metabolismo , Digestão , História do Século XXI , Humanos , Lactente
2.
J Acad Nutr Diet ; 120(5): 792-803.e5, 2020 05.
Artigo em Inglês | MEDLINE | ID: mdl-31636053

RESUMO

BACKGROUND: Millions of food-insecure households in the United States obtain food from food pantries each year. These foods are often of insufficient nutritional quality. OBJECTIVE: Our aim was to describe the frequency with which Arkansas food pantries offer foods included in Feeding America's Detailed Foods to Encourage (F2E) framework, and examine food pantry characteristics associated with increased frequency of offering F2E and other foods. DESIGN: This was a 27-item cross-sectional online survey that assessed food pantries' characteristics (eg, storage capacities, number of clients served) and typical food offerings. PARTICIPANTS/SETTING: Partnering with five of Arkansas's six food banks, 764 e-mail invitations were sent to food agency managers across the state. A final sample of 357 food pantries was included in the analyses. MAIN OUTCOME MEASURES: The primary outcomes of interest were the frequencies of offering specific F2E and F2E in general. The F2E framework was developed by Feeding America to more accurately assess food banks' inventories, and its categories (Fruits and Vegetables; Protein; Dairy; and Grains) are generally consistent with MyPlate. STATISTICAL ANALYSES PERFORMED: Descriptive statistics were computed for all food pantry characteristics and frequency of foods offered. Associations between food pantry characteristics and the frequency of offering F2E were examined via multiple linear regression and path analysis. RESULTS: Only 18.5% of food pantries had written nutrition guidelines, and only 19.3% offered client choice distribution. The F2E most commonly offered were meat/poultry/seafood without breading and not fried (59.6%) and peanut butter (58.2%). The least commonly offered F2E were nuts/seeds with nothing added (3.8%) and low-fat/1%/skim cheese (8.2%). Written nutrition guidelines (P<0.001), client choice distribution (P=0.003), and adequate refrigerator storage (P=0.010) were associated with more frequently offering F2E. CONCLUSIONS: This study fills a gap in knowledge by documenting food pantry characteristics that are associated with the frequencies of offering specific types of healthy foods.


Assuntos
Assistência Alimentar/estatística & dados numéricos , Armazenamento de Alimentos/estatística & dados numéricos , Abastecimento de Alimentos/estatística & dados numéricos , Fidelidade a Diretrizes/estatística & dados numéricos , Política Nutricional , Arkansas , Estudos Transversais , Laticínios/normas , Laticínios/provisão & distribuição , Proteínas Alimentares/normas , Proteínas Alimentares/provisão & distribuição , Grão Comestível/normas , Grão Comestível/provisão & distribuição , Armazenamento de Alimentos/normas , Abastecimento de Alimentos/normas , Frutas/normas , Frutas/provisão & distribuição , Humanos , Valor Nutritivo , Inquéritos e Questionários , Verduras/normas , Verduras/provisão & distribuição
3.
Am J Clin Nutr ; 110(2): 451-460, 2019 08 01.
Artigo em Inglês | MEDLINE | ID: mdl-31172179

RESUMO

BACKGROUND: Promoting plant-based proteins is at the forefront of many initiatives in public health nutrition. OBJECTIVES: The aim of this study was to characterize the sociodemographic drivers of plant-based protein diet consumption, and to study these in relation to diet quality and cost. METHODS: The Seattle Obesity Study series (SOS I and II) yielded the study sample (n = 1636). Sociodemographic data were obtained by survey self-report. Diet quality and cost came from the Fred Hutchinson Cancer Research Center Food-Frequency Questionnaire linked to retail food prices. The Healthy Eating Index 2010 (HEI-2010) and mean adequacy ratio (MAR) served as measures of diet quality. Linear regressions with robust standard errors examined associations. RESULTS: Total proteins contributed 16.8% of daily dietary energy. The breakdown by animal and plant proteins was 10.9% and 5.9%, respectively. The sociodemographic factors associated with plant-protein consumption were a positive attitude towards healthy eating and higher education but not income. Plant-protein diets were characterized by severalfold increases in nuts and seeds, soy and legumes, but much less meat, poultry, dairy, solid fats, and added sugars. Higher quartiles of plant-based diets were associated with significantly higher HEI-2010 (ß: 13.0 from quartile 1 to quartile 4; 95% CI: 11.8, 14.3) and higher MAR (ß: 6.0; 95% CI: 3.5, 8.5) with minimal impact on diet costs (ß: 0.35; 95% CI: 0.04, 0.67). In contrast, higher quartiles of animal-protein diets were associated with higher diet costs (ß: 1.07; 95% CI: 0.77, 1.36) but lower HEI-2010 (ß: -3.2; 95% CI: -4.5, -1.9). Each additional 3% of energy from plant proteins was associated with an 8.4-unit increase in HEI-2010 (95% CI: 7.6, 9.1) and with a 4.1-unit increase in MAR (95% CI: 2.7, 5.5) with a minimal increase in diet cost (ß: 0.28; 95% CI: 0.06, 0.50). CONCLUSION: Plant-based protein diets may be a cost-effective way to improve diet quality at all levels of income. Future research needs to evaluate the quality of plant-based protein in relation to amino acids and health.


Assuntos
Proteínas Alimentares/administração & dosagem , Proteínas Alimentares/normas , Alimentos/economia , Alimentos/normas , Adulto , Animais , Dieta Saudável , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Inquéritos Nutricionais , Obesidade/prevenção & controle , Proteínas de Plantas , Fatores Socioeconômicos , Washington , Adulto Jovem
4.
Appl Physiol Nutr Metab ; 44(1): 95-98, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30138570

RESUMO

Protein claims provide guidance to consumers seeking protein-rich foods. Protein claim regulations differ globally, and both Canada and the United States require protein quality assessments. A tripartite workshop identified the need to (i) harmonize, (ii) update existing amino acid composition and digestibility databases, (iii) develop non-animal bioassays, and (iv) evaluate the impact of protein claims on human health. The Protein-Digestibility Corrected Amino Acid Score method is recommended for current regulatory use in Canada.


Assuntos
Proteínas Alimentares/análise , Análise de Alimentos/legislação & jurisprudência , Rotulagem de Alimentos/legislação & jurisprudência , Qualidade dos Alimentos , Política Nutricional , Valor Nutritivo , Animais , Canadá , Consenso , Proteínas Alimentares/normas , Europa (Continente) , Análise de Alimentos/normas , Rotulagem de Alimentos/normas , Regulamentação Governamental , Humanos , Formulação de Políticas , Estados Unidos
5.
JPEN J Parenter Enteral Nutr ; 41(5): 706-742, 2017 07.
Artigo em Inglês | MEDLINE | ID: mdl-28686844

RESUMO

This document represents the first collaboration between 2 organizations-the American Society for Parenteral and Enteral Nutrition and the Society of Critical Care Medicine-to describe best practices in nutrition therapy in critically ill children. The target of these guidelines is intended to be the pediatric critically ill patient (>1 month and <18 years) expected to require a length of stay >2-3 days in a PICU admitting medical, surgical, and cardiac patients. In total, 2032 citations were scanned for relevance. The PubMed/MEDLINE search resulted in 960 citations for clinical trials and 925 citations for cohort studies. The EMBASE search for clinical trials culled 1661 citations. In total, the search for clinical trials yielded 1107 citations, whereas the cohort search yielded 925. After careful review, 16 randomized controlled trials and 37 cohort studies appeared to answer 1 of the 8 preidentified question groups for this guideline. We used the GRADE criteria (Grading of Recommendations, Assessment, Development, and Evaluation) to adjust the evidence grade based on assessment of the quality of study design and execution. These guidelines are not intended for neonates or adult patients. The guidelines reiterate the importance of nutrition assessment-particularly, the detection of malnourished patients who are most vulnerable and therefore may benefit from timely intervention. There is a need for renewed focus on accurate estimation of energy needs and attention to optimizing protein intake. Indirect calorimetry, where feasible, and cautious use of estimating equations and increased surveillance for unintended caloric underfeeding and overfeeding are recommended. Optimal protein intake and its correlation with clinical outcomes are areas of great interest. The optimal route and timing of nutrient delivery are areas of intense debate and investigations. Enteral nutrition remains the preferred route for nutrient delivery. Several strategies to optimize enteral nutrition during critical illness have emerged. The role of supplemental parenteral nutrition has been highlighted, and a delayed approach appears to be beneficial. Immunonutrition cannot be currently recommended. Overall, the pediatric critical care population is heterogeneous, and a nuanced approach to individualizing nutrition support with the aim of improving clinical outcomes is necessary.


Assuntos
Estado Terminal/terapia , Nutrição Enteral/normas , Nutrição Parenteral/normas , Sociedades Médicas , Criança , Transtornos da Nutrição Infantil/diagnóstico , Transtornos da Nutrição Infantil/terapia , Cuidados Críticos/normas , Proteínas Alimentares/administração & dosagem , Proteínas Alimentares/normas , Humanos , Unidades de Terapia Intensiva Pediátrica , Tempo de Internação , Avaliação Nutricional , Necessidades Nutricionais , Estado Nutricional , Ensaios Clínicos Controlados Aleatórios como Assunto
6.
J Nutr ; 147(3): 277-280, 2017 03.
Artigo em Inglês | MEDLINE | ID: mdl-28100604

RESUMO

Protein quality scores use the amino acid (AA) requirements of a healthy North American child. AA requirements vary with physiologic status. We estimated AA requirements for healthy North American children, children with environmental enteric dysfunction, children recovering from wasting, and children with an acute infection. The protein quality of food aid products was then calculated to determine whether it was sufficient in all these groups, and we found that it may not be adequate for all of them. Physiologic status is important when assessing the protein quality of food aid. Rates of weight gain from 8 published trials treating children with moderate acute malnutrition were abstracted, and protein quality scores from the corresponding food aid products were calculated with the use of the digestible indispensable amino acid score (DIAAS). Two DIAAS values were calculated, one in healthy children aged 1-3 y as a reference population and the other in malnourished children aged 1-3 y as a reference population. These data were used to calculate the best fit regression line between weight gain and protein quality. The slope of the regression line was greater when malnourished children were used as a reference population than when healthy children were used (0.128; 95% CI: 0.118, 0.138 compared with 0.097; 95% CI: 0.090, 0.105 measured in g · kg-1 · d-1 · DIASS U-1). These findings suggest that adjusting AA requirements for physiologic status may more accurately estimate the minimum protein quality of food aid products.


Assuntos
Aminoácidos , Transtornos da Nutrição Infantil , Proteínas Alimentares/normas , Assistência Alimentar , Transtornos da Nutrição Infantil/dietoterapia , Pré-Escolar , Abastecimento de Alimentos , Humanos , Lactente , Necessidades Nutricionais , Valor Nutritivo
7.
J Nutr ; 146(5): 929-32, 2016 05.
Artigo em Inglês | MEDLINE | ID: mdl-27052532

RESUMO

The Protein Digestibility Corrected Amino Acid Score (PDCAAS) has been adopted for assessing protein quality in human foods since 1991, and the shortcomings of using the PDCAAS have been recognized since its adoption. The 2011 FAO Expert Consultation recognized that the Digestible Indispensable Amino Acid Score (DIAAS) was superior to the PDCAAS for determining protein quality. However, there were insufficient human data on amino acid digestibility before adopting the DIAAS. More human data were needed before DIAAS could be implemented. In 2014, FAO convened an expert working group to propose and agree on research protocols using both human-based assays and animal models to study ileal amino acid digestibility (metabolic availability) of human foods. The working group identified 5 research protocols for further research and development. A robust database of protein digestibility of foods commonly consumed worldwide, including those consumed in low-income countries, is needed for an informed decision on adopting the DIAAS. A review on the impacts of using the DIAAS on public health policies is necessary. It would be advantageous to have a global coordinating effort to advance research and data collection. Collaboration with international and national agriculture institutes is desirable. Opportunities should be provided for young researchers, particularly those from developing countries, to engage in protein-quality research for sustainable implementation of DIAAS. To conclude, the DIAAS is a conceptually preferable method compared with the PDCAAS for protein and amino acid quality evaluation. However, the complete value of the DIAAS and its impact on public health nutrition cannot be realized until there are sufficient accumulated ileal amino acid digestibility data on human foods that are consumed in different nutritional and environmental conditions, measured by competent authorities. A future meeting may be needed to evaluate the size and quality of the data set and to determine the timeline for full adoption and implementation of the DIAAS.


Assuntos
Aminoácidos/metabolismo , Bases de Dados Factuais , Dieta/normas , Proteínas Alimentares/normas , Digestão , Íleo/metabolismo , Projetos de Pesquisa , Animais , Disponibilidade Biológica , Países em Desenvolvimento , Proteínas Alimentares/metabolismo , Necessidades e Demandas de Serviços de Saúde , Humanos , Cooperação Internacional , Nações Unidas
8.
Appl Physiol Nutr Metab ; 41(5): 565-72, 2016 May.
Artigo em Inglês | MEDLINE | ID: mdl-26960445

RESUMO

Substantial evidence supports the increased consumption of high-quality protein to achieve optimal health outcomes. A growing body of research indicates that protein intakes well above the current Recommended Dietary Allowance help to promote healthy aging, appetite regulation, weight management, and goals aligned with athletic performance. Higher protein intakes may help prevent age-related sarcopenia, the loss of muscle mass, and strength that predisposes older adults to frailty, disability, and loss of autonomy. Higher protein diets also improve satiety and lead to greater reductions in body weight and fat mass compared with standard protein diets, and may therefore serve as a successful strategy to help prevent and/or treat obesity. Athletes can also benefit from higher protein intakes to maximize athletic performance given the critical role protein plays in stimulating muscle protein remodelling after exercise. Protein quality, per meal dose, and timing of ingestion are also important considerations. Despite persistent beliefs to the contrary, we can find no evidence-based link between higher protein diets and renal disease or adverse bone health. This brief synopsis highlights recent learnings based on presentations at the 2015 Canadian Nutrition Society conference, Advances in Protein Nutrition across the Lifespan. Current evidence indicates intakes in the range of at least 1.2 to 1.6 g/(kg·day) of high-quality protein is a more ideal target for achieving optimal health outcomes in adults.


Assuntos
Envelhecimento , Proteínas Alimentares/administração & dosagem , Proteínas Alimentares/análise , Promoção da Saúde , Recomendações Nutricionais , Atletas , Desempenho Atlético , Peso Corporal , Manutenção do Peso Corporal , Canadá , Proteínas Alimentares/normas , Exercício Físico , Humanos , Refeições , Metanálise como Assunto , Debilidade Muscular/prevenção & controle , Valor Nutritivo , Sarcopenia/prevenção & controle , Sociedades Científicas , Fenômenos Fisiológicos da Nutrição Esportiva
9.
Ann N Y Acad Sci ; 1321: 1-19, 2014 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-25123207

RESUMO

The Food and Agriculture Organization of the United Nations estimates that 843 million people worldwide are hungry and a greater number suffer from nutrient deficiencies. Approximately one billion people have inadequate protein intake. The challenge of preventing hunger and malnutrition will become even greater as the global population grows from the current 7.2 billion people to 9.6 billion by 2050. With increases in income, population, and demand for more nutrient-dense foods, global meat production is projected to increase by 206 million tons per year during the next 35 years. These changes in population and dietary practices have led to a tremendous rise in the demand for food protein, especially animal-source protein. Consuming the required amounts of protein is fundamental to human growth and health. Protein needs can be met through intakes of animal and plant-source foods. Increased consumption of food proteins is associated with increased greenhouse gas emissions and overutilization of water. Consequently, concerns exist regarding impacts of agricultural production, processing and distribution of food protein on the environment, ecosystem, and sustainability. To address these challenging issues, the New York Academy of Sciences organized the conference "Frontiers in Agricultural Sustainability: Studying the Protein Supply Chain to Improve Dietary Quality" to explore sustainable innovations in food science and programming aimed at producing the required quality and quantity of protein through improved supply chains worldwide. This report provides an extensive discussion of these issues and summaries of the presentations from the conference.


Assuntos
Agricultura , Proteínas Alimentares , Qualidade dos Alimentos , Abastecimento de Alimentos/métodos , Agricultura/métodos , Agricultura/organização & administração , Agricultura/tendências , Animais , Proteínas Alimentares/normas , Proteínas Alimentares/provisão & distribuição , Humanos , Inovação Organizacional , Avaliação de Programas e Projetos de Saúde/métodos , Nações Unidas
10.
J Agric Food Chem ; 61(24): 5681-8, 2013 Jun 19.
Artigo em Inglês | MEDLINE | ID: mdl-23713744

RESUMO

The determination of prolamins by ELISA and subsequent conversion of the resulting concentration to gluten content in food appears to be a comparatively simple and straightforward process with which many laboratories have years-long experience. At the end of the process, a value of gluten, expressed in mg/kg or ppm, is obtained. This value often is the basis for the decision if a product can be labeled gluten-free or not. On the basis of currently available scientific information, the accuracy of the obtained values with commonly used commercial ELISA kits has to be questioned. Although recently several multilaboratory studies have been conducted in an attempt to emphasize and ensure the accuracy of the results, data suggest that it was the precision of these assays, not the accuracy, that was confirmed because some of the underlying assumptions for calculating the gluten content lack scientific data support as well as appropriate reference materials for comparison. This paper discusses the issues of gluten determination and quantification with respect to antibody specificity, extraction procedures, reference materials, and their commutability.


Assuntos
Alérgenos/análise , Proteínas Alimentares/análise , Inspeção de Alimentos/métodos , Glutens/análise , Alérgenos/química , Alérgenos/isolamento & purificação , Especificidade de Anticorpos , Dieta Livre de Glúten , Proteínas Alimentares/química , Proteínas Alimentares/isolamento & purificação , Proteínas Alimentares/normas , Grão Comestível/química , Ensaio de Imunoadsorção Enzimática/normas , União Europeia , Inspeção de Alimentos/normas , Rotulagem de Alimentos/legislação & jurisprudência , Rotulagem de Alimentos/normas , Glutens/química , Glutens/isolamento & purificação , Glutens/normas , Humanos , Legislação sobre Alimentos , Limite de Detecção , Fragmentos de Peptídeos/análise , Fragmentos de Peptídeos/química , Fragmentos de Peptídeos/isolamento & purificação , Fragmentos de Peptídeos/normas , Prolaminas/análise , Prolaminas/isolamento & purificação , Padrões de Referência , Reprodutibilidade dos Testes
11.
Adv Nutr ; 2(3): 217-24, 2011 May.
Artigo em Inglês | MEDLINE | ID: mdl-22332054

RESUMO

Africa shares a unique relationship with maize (Zea mays). After its introduction from New World explorers, maize was quickly adopted as the cornerstone of local cuisine, especially in sub-Saharan countries. Although maize provides macro- and micronutrients required for humans, it lacks adequate amounts of the essential amino acids lysine and tryptophan. For those consuming >50% of their daily energy from maize, pandemic protein malnutrition may exist. Severe protein and energy malnutrition increases susceptibility to life-threatening diseases such as tuberculosis and gastroenteritis. A nutritionally superior maize cultivar named quality protein maize (QPM) represents nearly one-half century of research dedicated to malnutrition eradication. Compared with traditional maize types, QPM has twice the amount of lysine and tryptophan, as well as protein bioavailability that rivals milk casein. Animal and human studies suggest that substituting QPM for common maize results in improved health. However, QPM's practical contribution to maize-subsisting populations remains unresolved. Herein, total protein and essential amino acid requirements recommended by the WHO and the Institute of Medicine were applied to estimate QPM target intake levels for young children and adults, and these were compared with mean daily maize intakes by African country. The comparisons revealed that ~100 g QPM is required for children to maintain adequacy of lysine, the most limiting amino acid, and nearly 500 g is required for adults. This represents a 40% reduction in maize intake relative to common maize to meet protein requirements. The importance of maize in Africa underlines the potential for QPM to assist in closing the protein inadequacy gap.


Assuntos
Dieta/normas , Proteínas Alimentares/metabolismo , Abastecimento de Alimentos , Disparidades nos Níveis de Saúde , Necessidades Nutricionais , Desnutrição Proteico-Calórica/prevenção & controle , Zea mays , África , Animais , Proteínas Alimentares/normas , Ingestão de Energia , Disparidades em Assistência à Saúde , Humanos , Lisina/administração & dosagem , Lisina/metabolismo , Triptofano/administração & dosagem , Triptofano/metabolismo , Populações Vulneráveis , Zea mays/metabolismo
12.
Artigo em Inglês | MEDLINE | ID: mdl-20526921

RESUMO

At present, European legislation prohibits totally the use of processed animal proteins in feed for all farmed animals (Commission Regulation (EC) No. 1234/2003-extended feed ban). A softening of the feed ban for non-ruminants would nevertheless be considered if alternative methods could be used to gain more information concerning the species origin of processed animal proteins than that which can be provided by classical optical microscopy. This would allow control provisions such as the ban of feeding animals with proteins from the same species or intra-species recycling (Regulation (EC) No. 1774/2002). Two promising alternative methods, near-infrared microscopy (NIRM) and real-time polymerase chain reaction (PCR), were combined to authenticate, at the species level, the presence of animal particles. The paper describes the improvements of the real-time PCR method made to the DNA extraction protocol, allowing five PCR analyses to be performed with the DNA extracted from a single particle.


Assuntos
Ração Animal/análise , Contaminação de Alimentos , Inspeção de Alimentos/métodos , Produtos da Carne/análise , Microscopia/métodos , Reação em Cadeia da Polimerase/métodos , Espectroscopia de Infravermelho com Transformada de Fourier/métodos , Métodos Analíticos de Preparação de Amostras , Ração Animal/normas , Criação de Animais Domésticos/legislação & jurisprudência , Criação de Animais Domésticos/métodos , Animais , Animais Domésticos/genética , DNA/isolamento & purificação , Proteínas Alimentares/normas , União Europeia , Contaminação de Alimentos/prevenção & controle , Inspeção de Alimentos/economia , Doenças Transmitidas por Alimentos/prevenção & controle , Genótipo , Resíduos Industriais/análise , Resíduos Industriais/economia , Indústria de Embalagem de Carne/economia , Indústria de Embalagem de Carne/métodos , Reprodutibilidade dos Testes , Especificidade da Espécie
13.
J Med Food ; 12(5): 1149-53, 2009 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-19857082

RESUMO

The edible mushroom Pleurotus sajor-caju, cultivated on corncobs and obtained from the wild, was assessed by nutritional indices. The protein efficiency ratios obtained for the rats fed stalk diet (2.16) and that of rats fed native P. sajor-caju cap diet (2.14) were not significantly different (P >or= .05) from one another but were lower than the casein control (2.50), whereas the value for the wild cap diet-fed rats (2.99) was significantly higher (P or= .05) from the control. Biochemical parameters analyzed include serum albumin, total protein, and hemoglobin. Serum albumin concentrations of both the cultivated and wild cap diet-fed rats were not significantly different (P >or= .05) from that of the control, whereas those of the two stalk diet-fed groups were significantly higher (P

Assuntos
Proteínas Alimentares , Valor Nutritivo , Pleurotus/química , Animais , Proteínas Sanguíneas/metabolismo , Caseínas , Proteínas Alimentares/metabolismo , Proteínas Alimentares/normas , Carpóforos , Hemoglobinas/metabolismo , Masculino , Ratos , Albumina Sérica/metabolismo
14.
J Appl Toxicol ; 29(2): 141-8, 2009 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-18937215

RESUMO

Assessment of the potential allergenicity of novel proteins, including those expressed in genetically modified plants, is an important issue. In previous studies, we have shown that the IgE measurement induced by systemic exposure of BALB/c mice to a range of proteins correlates broadly with what is known of their allergenic potential in humans. The approach used a homologous passive cutaneous anaphylaxis (PCA) assay that reflects IgE-dependent biological activity and is of sufficient sensitivity to detect IgE production in the absence of adjuvant. In previous studies, the immunization phase was conducted independently in two separate facilities, and the subsequent analytical work (PCA) conducted in a single facility. The purpose here was to further evaluate the transferability of this approach. To this end, BALB/c mice were exposed to a range of doses of peanut agglutinin or ovalbumin, allergenic proteins of peanut and hen's egg, respectively, in two independent laboratories. Serial doubling dilutions of serum pooled for each treatment group were analyzed for specific IgE. At higher doses of allergen very similar, or identical, IgE titers were achieved in both laboratories, although at lower doses, responses were somewhat more variable. These data demonstrate that, although technically demanding, the measurement of protein allergen-induced IgE antibody production in mice using PCA is relatively robust and is transferable and reproducible between laboratories. This approach may provide a useful tool for the safety assessment of novel proteins and suggests that continued evaluation of the approach with a wider range of protein allergens and non-sensitising proteins is justified.


Assuntos
Alérgenos/imunologia , Proteínas Alimentares/normas , Testes Imunológicos/normas , Laboratórios/normas , Proteínas/imunologia , Animais , Proteínas Alimentares/imunologia , Relação Dose-Resposta a Droga , Feminino , Imunoglobulina E/análise , Imunoglobulina E/biossíntese , Imunoglobulina E/imunologia , Imunoglobulina G/análise , Imunoglobulina G/imunologia , Camundongos , Camundongos Endogâmicos BALB C , Ovalbumina/imunologia , Anafilaxia Cutânea Passiva , Aglutinina de Amendoim/imunologia , Medição de Risco
15.
Am J Clin Nutr ; 87(5): 1576S-1581S, 2008 May.
Artigo em Inglês | MEDLINE | ID: mdl-18469291

RESUMO

Protein quality describes characteristics of a protein in relation to its ability to achieve defined metabolic actions. Traditionally, this has been discussed solely in the context of a protein's ability to provide specific patterns of amino acids to satisfy the demands for synthesis of protein as measured by animal growth or, in humans, nitrogen balance. As understanding of protein's actions expands beyond its role in maintaining body protein mass, the concept of protein quality must expand to incorporate these newly emerging actions of protein into the protein quality concept. New research reveals increasingly complex roles for protein and amino acids in regulation of body composition and bone health, gastrointestinal function and bacterial flora, glucose homeostasis, cell signaling, and satiety. The evidence available to date suggests that quality is important not only at the minimum Recommended Dietary Allowance level but also at higher intakes. Currently accepted methods for measuring protein quality do not consider the diverse roles of indispensable amino acids beyond the first limiting amino acid for growth or nitrogen balance. As research continues to evolve in assessing protein's role in optimal health at higher intakes, there is also need to continue to explore implications for protein quality assessment.


Assuntos
Proteínas Alimentares/administração & dosagem , Proteínas Alimentares/normas , Necessidades Nutricionais , Proteínas/metabolismo , Saciação/efeitos dos fármacos , Aminoácidos de Cadeia Ramificada/administração & dosagem , Aminoácidos de Cadeia Ramificada/metabolismo , Aminoácidos Essenciais/administração & dosagem , Aminoácidos Essenciais/metabolismo , Disponibilidade Biológica , Humanos , Política Nutricional , Valor Nutritivo , Controle de Qualidade , Saciação/fisiologia
16.
Vopr Pitan ; 74(3): 14-7, 2005.
Artigo em Russo | MEDLINE | ID: mdl-16044835

RESUMO

The article this research is devoted to the Orenburg student youth diet. The revealed deficiency of major nutrients (protein, fats and especially carbohydrates), as vitamins (C, PP, E, D, B groups) and analysis of diet ration concerning basis nourishing components, vitamins, macro- micro elements (Zn, Cu, I, Cr, Se).


Assuntos
Dieta , Adulto , Deficiência de Vitaminas/etiologia , Carboidratos/deficiência , Dieta/normas , Inquéritos sobre Dietas , Carboidratos da Dieta/normas , Proteínas Alimentares/normas , Feminino , Humanos , Masculino , Deficiência de Proteína/etiologia , Federação Russa , Estudantes , Oligoelementos/deficiência , Oligoelementos/normas , Vitaminas/normas
17.
J Anim Physiol Anim Nutr (Berl) ; 89(3-6): 184-8, 2005.
Artigo em Inglês | MEDLINE | ID: mdl-15787992

RESUMO

The aim of this study was to examine the feeding value of different yeasts as a substitute for soya bean meal, the main protein source in diets of weaned piglets. Tested two yeasts were already available on the market, Saccharomyces cerevisiae and Kluyveromyces lactis (beer and milk yeast), which replaced 40% of the soya bean meal in the diets. Furthermore, a yeast (Kluyveromyces fragilis) grown on whey, a side-product of cheese production, was used in increasing concentrations in the diets, so that increasing amounts of the soya bean meal (20%, 40% and 60%) could be replaced. As proved in these experiments, a replacement of 60% of the soya protein with whey yeast protein had positive effects on the performances (daily weight gain) and on the N-metabolism and did not have negative effects on the health or the faeces consistency. The whey yeast stands out because of its high protein quality (N-digestibility and N-retention). Furthermore, the replacement of soya bean meal with highly digestible yeasts is welcomed under the aspect of animal health, because of the reduction of anti-nutritive soya components (stachyose, glycinin) in diets of weaned piglets. The controlled production conditions of the yeasts result in a high feed safety; in addition, the yeast as an end-of-pipe-product is a resource conserving and valuable feed. A main stimulus for the use of yeasts, however, in a food production controlled by economic standpoints, is their price and the costs of other competing feeds.


Assuntos
Proteínas Alimentares/administração & dosagem , Digestão/fisiologia , Nitrogênio/metabolismo , Suínos/metabolismo , Leveduras , Ração Animal/economia , Fenômenos Fisiológicos da Nutrição Animal , Animais , Proteínas Alimentares/metabolismo , Proteínas Alimentares/normas , Digestão/efeitos dos fármacos , Fezes/química , Proteínas Fúngicas/administração & dosagem , Proteínas Fúngicas/metabolismo , Kluyveromyces/química , Valor Nutritivo , Distribuição Aleatória , Saccharomyces/química , Proteínas de Soja/administração & dosagem , Proteínas de Soja/metabolismo , Suínos/crescimento & desenvolvimento , Desmame , Aumento de Peso , Leveduras/química
18.
Nahrung ; 47(4): 269-73, 2003 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-13678268

RESUMO

The present study was designed to quantitatively measure and compare the levels and variations of total protein, individual amino acids, and computed protein efficiency ratio (C-PER) in raw and traditionally processed products of one recently released quality protein maize (QPM BH542) with four high-yield maize hybrids, namely flint BH660, semi-dent BH140, Pioneer 30H83, and Pioneer 30G97, as well as one local maize cultivar. The total protein content was variable among the cultivars ranging from 7% for BH660 to 8.6% for Pioneer 30H83, 8.9% for BH140, 9.8% for QPM BH542, 10.1% for local maize cultivar, and 11.8% for Pioneer 30G97, respectively. However, the QPM BH542 maize protein proved to be higher in nutritional quality than common maize proteins because it contained 30% to 82% more lysine, higher levels of arginine, tryptophan, histidine, threonine, cysteine, and valine. As a result, the QPM BH542 amino acid profile gives a good balance of total essential amino acids, limited only in lysine, and has a C-PER ratio of 2.2 compared to 1.14, 1.2, 1.4, 1.66, and 1.67 for Pioneer 30G97, local, BH-140, BH660, and Pioneer 30H83, respectively. The various traditional processes of maize have no significant effect on the protein nutritional quality of the new quality protein maize. Hence, the widely dissemination of it in agricultural cultivation as well as consumption by the general population is recommended.


Assuntos
Proteínas Alimentares/normas , Manipulação de Alimentos/métodos , Proteínas de Plantas/normas , Zea mays , Aminoácidos/análise , Proteínas Alimentares/análise , Digestão , Etiópia , Humanos , Necessidades Nutricionais , Valor Nutritivo , Proteínas de Plantas/análise , Plantas Geneticamente Modificadas , Zea mays/genética
19.
J Environ Sci Health B ; 37(1): 93-101, 2002 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-11990363

RESUMO

The objectives of the present study were to evaluate the nutritional quality of genetically modified sweetpotato (genotype PI318846-3) on growth, lipid metabolism, and protein metabolism of hamsters. Three different diets made with transgenic and nontransgenic sweetpotato protein flour including a control diet with casein were fed to male Golden Syrian hamsters for 28 days. The protein efficiency ratio (1.35 +/- 0.01) of the transgenic sweetpotato protein diet was significantly higher (p<0.05) than the nontransgenic sweetpotato and control diets. Plasma albumin and plasma total protein concentrations of hamsters fed the sweetpotato diets were significantly lower (p<0.05) than that of the control. The casein diet (control) produced hypercholesterolemia in hamsters, whereas sweetpotato diets maintained lower plasma and liver total and LDL-cholesterol concentrations in hamsters. Sweetpotatoes contain less amount of protein to maintain the normal animal growth; however, transgenic sweetpotato has good quality protein that supported the growth of hamsters better than nontransgenic sweetpotato.


Assuntos
Proteínas Alimentares/análise , Ipomoea batatas/química , Ipomoea batatas/genética , Lipídeos/sangue , Mesocricetus/crescimento & desenvolvimento , Plantas Geneticamente Modificadas/química , Albuminas/análise , Animais , Peso Corporal , Cricetinae , Proteínas Alimentares/normas , Fígado/metabolismo , Masculino , Mesocricetus/metabolismo , Estado Nutricional , Valor Nutritivo , Plantas Geneticamente Modificadas/genética , Proteínas/análise , Proteínas/metabolismo , Distribuição Aleatória
20.
Nutr Health ; 15(1): 47-53, 2001.
Artigo em Inglês | MEDLINE | ID: mdl-11403373

RESUMO

The study aimed at improving the nutritive quality of cornpap, "Ogi", the most popular infant feed in Nigeria. Milk samples of cowpea, groundnut and soyabean and their complementations with cornpap were assessed chemically, organoleptically and anthropometrically. The protein contents of milk from cowpea, groundnut and soyabean were 1.18, 1.6, and 1.23% respectively. On separate complementation of the milk sources with cornpap, the low protein content of "ogi" was increased from 0.3% to 2.79% with cowpea; 3.0% with groundnut and 3.64% with soyabean. The fat content of the complementary feeds also increased remarkably. The anthropometric study revealed that there were significant differences P = 0.001 between the mean weight of children aged 13 to 18 (92 +/- 1.2) and 19 to 24 months (9.9 +/- 1.3) who were fed the three sources of milk with cornpap, and the control group of the same age groups (8.5 + 1.5; 9.3 + 1.11) who received nutrition education and no complementary feeds. Of the three sources of milk, groundnut milk was ranked as the most likeable, the easiest to prepare and the least costly by the nursing mothers. This study has shown that some of the deep rooted cultural food taboos that prohibit locally available and nutritious feeds to infants could be changed through practical food demonstrations.


Assuntos
Proteínas Alimentares/normas , Fabaceae , Alimentos Infantis/normas , Leite/química , Plantas Medicinais , Zea mays/metabolismo , Animais , Arachis , Culinária , Gorduras na Dieta , Comportamento Alimentar , Feminino , Análise de Alimentos , Humanos , Lactente , Alimentos Infantis/análise , Alimentos Infantis/economia , Transtornos da Nutrição do Lactente , Masculino , Valor Nutritivo , Glycine max , Paladar , Desmame
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA