%0 Journal Article %J Diabetes Care %D 2010 %T Interactions of dietary whole-grain intake with fasting glucose- and insulin-related genetic loci in individuals of European descent: a meta-analysis of 14 cohort studies. %A Nettleton, Jennifer A %A McKeown, Nicola M %A Kanoni, Stavroula %A Lemaitre, Rozenn N %A Hivert, Marie-France %A Ngwa, Julius %A van Rooij, Frank J A %A Sonestedt, Emily %A Wojczynski, Mary K %A Ye, Zheng %A Tanaka, Tosh %A Garcia, Melissa %A Anderson, Jennifer S %A Follis, Jack L %A Djousse, Luc %A Mukamal, Kenneth %A Papoutsakis, Constantina %A Mozaffarian, Dariush %A Zillikens, M Carola %A Bandinelli, Stefania %A Bennett, Amanda J %A Borecki, Ingrid B %A Feitosa, Mary F %A Ferrucci, Luigi %A Forouhi, Nita G %A Groves, Christopher J %A Hallmans, Goran %A Harris, Tamara %A Hofman, Albert %A Houston, Denise K %A Hu, Frank B %A Johansson, Ingegerd %A Kritchevsky, Stephen B %A Langenberg, Claudia %A Launer, Lenore %A Liu, Yongmei %A Loos, Ruth J %A Nalls, Michael %A Orho-Melander, Marju %A Renstrom, Frida %A Rice, Kenneth %A Riserus, Ulf %A Rolandsson, Olov %A Rotter, Jerome I %A Saylor, Georgia %A Sijbrands, Eric J G %A Sjogren, Per %A Smith, Albert %A Steingrímsdóttir, Laufey %A Uitterlinden, André G %A Wareham, Nicholas J %A Prokopenko, Inga %A Pankow, James S %A van Duijn, Cornelia M %A Florez, Jose C %A Witteman, Jacqueline C M %A Dupuis, Josée %A Dedoussis, George V %A Ordovas, Jose M %A Ingelsson, Erik %A Cupples, L Adrienne %A Siscovick, David S %A Franks, Paul W %A Meigs, James B %K Adult %K Aged %K Blood Glucose %K Edible Grain %K Fasting %K Female %K Genetic Loci %K Genome-Wide Association Study %K Genotype %K Humans %K Insulin %K Male %K Middle Aged %K Polymorphism, Single Nucleotide %K White People %X

OBJECTIVE: Whole-grain foods are touted for multiple health benefits, including enhancing insulin sensitivity and reducing type 2 diabetes risk. Recent genome-wide association studies (GWAS) have identified several single nucleotide polymorphisms (SNPs) associated with fasting glucose and insulin concentrations in individuals free of diabetes. We tested the hypothesis that whole-grain food intake and genetic variation interact to influence concentrations of fasting glucose and insulin.

RESEARCH DESIGN AND METHODS: Via meta-analysis of data from 14 cohorts comprising ∼ 48,000 participants of European descent, we studied interactions of whole-grain intake with loci previously associated in GWAS with fasting glucose (16 loci) and/or insulin (2 loci) concentrations. For tests of interaction, we considered a P value <0.0028 (0.05 of 18 tests) as statistically significant.

RESULTS: Greater whole-grain food intake was associated with lower fasting glucose and insulin concentrations independent of demographics, other dietary and lifestyle factors, and BMI (β [95% CI] per 1-serving-greater whole-grain intake: -0.009 mmol/l glucose [-0.013 to -0.005], P < 0.0001 and -0.011 pmol/l [ln] insulin [-0.015 to -0.007], P = 0.0003). No interactions met our multiple testing-adjusted statistical significance threshold. The strongest SNP interaction with whole-grain intake was rs780094 (GCKR) for fasting insulin (P = 0.006), where greater whole-grain intake was associated with a smaller reduction in fasting insulin concentrations in those with the insulin-raising allele.

CONCLUSIONS: Our results support the favorable association of whole-grain intake with fasting glucose and insulin and suggest a potential interaction between variation in GCKR and whole-grain intake in influencing fasting insulin concentrations.

%B Diabetes Care %V 33 %P 2684-91 %8 2010 Dec %G eng %N 12 %1 https://www.ncbi.nlm.nih.gov/pubmed/20693352?dopt=Abstract %R 10.2337/dc10-1150