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- Registro de ensaios clínicos dos EUA
- Ensaio Clínico NCT01371396
Effect of Dietary Macronutrient Composition
Effect of Dietary Macronutrient Composition on Liver Substrate Metabolism
Visão geral do estudo
Status
Intervenção / Tratamento
Descrição detalhada
Obesity is a major factor driving the increased prevalence of hepatic steatosis in the US. However, little is known regarding the relationship between dietary intake and hepatic fat deposition or about the factors that promote loss of hepatic steatosis. Here, the investigators will determine how differences in dietary composition affect the development and regression of fatty liver. The investigators hypothesize that Hispanic subjects with metabolic syndrome will have higher liver fat synthesis rates compared to African American subjects.
Using detailed in vivo, serial measurements of fuel metabolism (GC/MS and NMR) fatty acid metabolism will be measured in the liver and periphery. This will be the first study in which these two methodologies are used together to assess both glucose and fatty acid metabolism in the same subjects. Subjects will be tested before and after a dietary weight-loss intervention producing 6% body weight loss over 5 months.
The specific aims are as follows:
AIM 1: Determine the contribution of peripheral and dietary fat to liver-TG in Hispanics and African Americans with metabolic syndrome.
Hypothesis: De novo lipogenesis will contribute to liver-TG in greater quantities compared to African Americans.
AIM 2: Determine the effects of low-CHO and low-fat diets on liver fat regression.
Hypothesis: Compared to a low-fat diet, a low-CHO diet will markedly decrease markers of inflammation coincident with greater improvements in insulin sensitivity as assessed by an intravenous glucose tolerance test.
Tipo de estudo
Inscrição (Real)
Estágio
- Não aplicável
Contactos e Locais
Locais de estudo
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Texas
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Dallas, Texas, Estados Unidos, 75390-9052
- Center for Human Nutrition
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Critérios de participação
Critérios de elegibilidade
Idades elegíveis para estudo
Aceita Voluntários Saudáveis
Gêneros Elegíveis para o Estudo
Descrição
Inclusion Criteria:
- Elevated serum ALT or metabolic syndrome
- African American or Hispanic
- Nondiabetic
- Men or women
- Smokers and nonsmokers
- Pre- and post-menopausal (+/- HRT)
- Stable body weight
- Age 20-65 years
- BMI between 25-45 kg/m2
Exclusion Criteria:
- Diabetes or Pregnancy
- Ethanol intake: males > 140 g/week, females > 70 g/week
- Chronic hepatitis B or chronic hepatitis C
- Hemochromatosis or Wilson's Disease
- Autoimmune hepatitis or primary biliary cirrhosis
Plano de estudo
Como o estudo é projetado?
Detalhes do projeto
- Finalidade Principal: Ciência básica
- Alocação: Randomizado
- Modelo Intervencional: Atribuição fatorial
- Mascaramento: Nenhum (rótulo aberto)
Armas e Intervenções
Grupo de Participantes / Braço |
Intervenção / Tratamento |
|---|---|
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Outro: Hispanic subjects
Subjects will identify as Hispanic ethnicity.
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The subject will consume a diet that is calorically restricted to cause at least a 6% body weight loss over 4 months.
Fat will make up less than 30% of dietary energy.
The diet will be restricted in energy to cause at least a 6% loss of body weight over a 4 month period.
Carbohydrate will provide less than 40% of total dietary energy.
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Outro: African American subjects
Subjects will self-identify as African American in origin.
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The subject will consume a diet that is calorically restricted to cause at least a 6% body weight loss over 4 months.
Fat will make up less than 30% of dietary energy.
The diet will be restricted in energy to cause at least a 6% loss of body weight over a 4 month period.
Carbohydrate will provide less than 40% of total dietary energy.
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O que o estudo está medindo?
Medidas de resultados primários
Medida de resultado |
Descrição da medida |
Prazo |
|---|---|---|
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de novo lipogenesis
Prazo: Change from Baseline in fatty acid synthesis at 5 months
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In vivo measurement is made of liver fatty acid synthesis using stable isotope administration and analysis of plasma samples by GS/MS
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Change from Baseline in fatty acid synthesis at 5 months
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Medidas de resultados secundários
Medida de resultado |
Descrição da medida |
Prazo |
|---|---|---|
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Dietary fatty acid clearance to liver
Prazo: Change from Baseline in dietary fat clearance at 5 months
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Using a dietary stable isotope we will quantitate fat absorption and recycling of fat through the liver.
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Change from Baseline in dietary fat clearance at 5 months
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Adipose fatty acid flux
Prazo: Change from Baseline in adipose fat flux at 5 months
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A stable isotope is infused and the rate of adipose fatty acid release is calculated after analyzing blood samples.
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Change from Baseline in adipose fat flux at 5 months
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Colaboradores e Investigadores
Patrocinador
Investigadores
- Investigador principal: Elizabeth J Parks, PhD, UTSW Medical Center
Publicações e links úteis
Publicações Gerais
- Shetty S, Ramos-Roman MA, Cho YR, Brown J, Plutzky J, Muise ES, Horton JD, Scherer PE, Parks EJ. Enhanced fatty acid flux triggered by adiponectin overexpression. Endocrinology. 2012 Jan;153(1):113-22. doi: 10.1210/en.2011-1339. Epub 2011 Nov 1.
- Ramos-Roman MA, Sweetman L, Valdez MJ, Parks EJ. Postprandial changes in plasma acylcarnitine concentrations as markers of fatty acid flux in overweight and obesity. Metabolism. 2012 Feb;61(2):202-12. doi: 10.1016/j.metabol.2011.06.008. Epub 2011 Aug 5.
- Sunny NE, Parks EJ, Browning JD, Burgess SC. Excessive hepatic mitochondrial TCA cycle and gluconeogenesis in humans with nonalcoholic fatty liver disease. Cell Metab. 2011 Dec 7;14(6):804-10. doi: 10.1016/j.cmet.2011.11.004.
- Satapati S, Kucejova B, Duarte JA, Fletcher JA, Reynolds L, Sunny NE, He T, Nair LA, Livingston KA, Fu X, Merritt ME, Sherry AD, Malloy CR, Shelton JM, Lambert J, Parks EJ, Corbin I, Magnuson MA, Browning JD, Burgess SC. Mitochondrial metabolism mediates oxidative stress and inflammation in fatty liver. J Clin Invest. 2016 Apr 1;126(4):1605. doi: 10.1172/JCI86695. Epub 2016 Apr 1. No abstract available.
- Lee JJ, Lambert JE, Hovhannisyan Y, Ramos-Roman MA, Trombold JR, Wagner DA, Parks EJ. Palmitoleic acid is elevated in fatty liver disease and reflects hepatic lipogenesis. Am J Clin Nutr. 2015 Jan;101(1):34-43. doi: 10.3945/ajcn.114.092262. Epub 2014 Nov 19.
- Lambert JE, Parks EJ. Getting the label in: practical research strategies for tracing dietary fat. Int J Obes Suppl. 2012 Dec;2(Suppl 2):S43-50. doi: 10.1038/ijosup.2012.22. Epub 2012 Dec 11.
- Ramos-Roman MA, Lapidot SA, Phair RD, Parks EJ. Insulin activation of plasma nonesterified fatty acid uptake in metabolic syndrome. Arterioscler Thromb Vasc Biol. 2012 Aug;32(8):1799-808. doi: 10.1161/ATVBAHA.112.250019. Epub 2012 Jun 21.
Datas de registro do estudo
Datas Principais do Estudo
Início do estudo (Real)
Conclusão Primária (Real)
Conclusão do estudo (Real)
Datas de inscrição no estudo
Enviado pela primeira vez
Enviado pela primeira vez que atendeu aos critérios de CQ
Primeira postagem (Estimativa)
Atualizações de registro de estudo
Última Atualização Postada (Real)
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última verificação
Mais Informações
Termos relacionados a este estudo
Palavras-chave
Termos MeSH relevantes adicionais
Outros números de identificação do estudo
- 5RL-1DK081187
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