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Obesity susceptibility loci and dietary intake in the Look AHEAD Trial.

ABSTRACT: Genome-wide association studies (GWAS) have identified consistent associations with obesity. However, the mechanisms remain unclear.The objective was to determine the association between obesity susceptibility loci and dietary intake.The association of GWAS-identified obesity risk alleles (FTO, MC4R, SH2B1, BDNF, INSIG2, TNNI3K, NISCH-STAB1, MTIF3, MAP2K5, QPCTL/GIPR, and PPARG) with dietary intake, measured through food-frequency questionnaires, was investigated in 2075 participants from the Look AHEAD (Action for Health in Diabetes) clinical trial. We adjusted for age, sex, population stratification, and study site.Obesity risk alleles at FTO rs1421085 significantly predicted more eating episodes per day (P = 0.001)-an effect that persisted after adjustment for body weight (P = 0.004). Risk variants within BDNF were significantly associated with more servings from the dairy product and the meat, eggs, nuts, and beans food groups (P ? 0.004). The risk allele at SH2B1 rs4788099 was significantly associated with more servings of dairy products (P = 0.001), whereas the risk allele at TNNI3K rs1514176 was significantly associated with a lower percentage of energy from protein (P = 0.002).These findings suggest that obesity risk loci may affect the pattern and content of food consumption among overweight or obese individuals with type 2 diabetes. The Look AHEAD Genetic Ancillary Study was registered at clinicaltrials.gov as NCT01270763 and the Look AHEAD study as NCT00017953.

SUBMITTER: McCaffery JM

PROVIDER: S-EPMC3349457 | biostudies-literature | 2012 Jun

REPOSITORIES: biostudies-literature

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Obesity susceptibility loci and dietary intake in the Look AHEAD Trial.

McCaffery Jeanne M JM Papandonatos George D GD Peter Inga I Huggins Gordon S GS Raynor Hollie A HA Delahanty Linda M LM Cheskin Lawrence J LJ Balasubramanyam Ashok A Wagenknecht Lynne E LE Wing Rena R RR

The American journal of clinical nutrition 20120418 6

<h4>Background</h4>Genome-wide association studies (GWAS) have identified consistent associations with obesity. However, the mechanisms remain unclear.<h4>Objective</h4>The objective was to determine the association between obesity susceptibility loci and dietary intake.<h4>Design</h4>The association of GWAS-identified obesity risk alleles (FTO, MC4R, SH2B1, BDNF, INSIG2, TNNI3K, NISCH-STAB1, MTIF3, MAP2K5, QPCTL/GIPR, and PPARG) with dietary intake, measured through food-frequency questionnaire ...[more]

PMID: 22513296

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Project description:BACKGROUND:Little has been reported regarding food and nutrient intake in individuals diagnosed with type 2 diabetes, and most reports have been based on findings in select groups or individuals who self-reported having diabetes. OBJECTIVE:To describe the baseline food and nutrient intake of the Look AHEAD (Action for Health in Diabetes) trial participants, compare participant intake to national guidelines, and describe demographic and health characteristics associated with food group consumption. METHODS:The Look AHEAD trial is evaluating the effects of a lifestyle intervention (calorie control and increased physical activity for weight loss) compared with diabetes support and education on long-term cardiovascular and other health outcomes. Participants are 45 to 75 years old, overweight or obese (body mass index [BMI] > or = 25), and have type 2 diabetes. In this cross-sectional analysis, baseline food consumption was assessed by food frequency questionnaire from 2,757 participants between September 2000 and December 2003. STATISTICAL ANALYSIS:Descriptive statistics were used to summarize intake by demographic characteristics. Kruskal-Wallis tests assessed univariate effects of characteristics on consumption. Multiple linear regression models assessed factors predictive of intake. Least square estimates were based on final models, and logistic regression determined factors predictive of recommended intake. RESULTS:Ninety-three percent of the participants exceeded the recommended percentage of calories from fat, 85% exceeded the saturated fat recommendation, and 92% consumed too much sodium. Also, fewer than half met the minimum recommended servings of fruit, vegetables, dairy, and grains. CONCLUSIONS:These participants with pre-existing diabetes did not meet recommended food and nutrition guidelines. These overweight adults diagnosed with diabetes are exceeding recommended intake of fat, saturated fats, and sodium, which may contribute to increasing their risk of cardiovascular disease and other chronic diseases.

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Obesity susceptibility loci and dietary intake in the Look AHEAD Trial.

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Obesity susceptibility loci and dietary intake in the Look AHEAD Trial.

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