Carbohydrates, Dietary Fiber, and Incident Type 2 Diabetes in Older Women

Am J Clin Nutr. 2000 Apr;71(4):921-30. doi: 10.1093/ajcn/71.4.921.

Abstract

Background: Dietary carbohydrates may influence the development of type 2 (non-insulin-dependent) diabetes, for example, through effects on blood glucose and insulin concentrations.

Objective: We examined the relations of baseline intake of carbohydrates, dietary fiber, dietary magnesium, and carbohydrate-rich foods and the glycemic index with incidence of diabetes.

Design: This was a prospective cohort study of 35988 older Iowa women initially free of diabetes. During 6 y of follow-up, 1141 incident cases of diabetes were reported.

Results: Total grain, whole-grain, total dietary fiber, cereal fiber, and dietary magnesium intakes showed strong inverse associations with incidence of diabetes after adjustment for potential nondietary confounding variables. Multivariate-adjusted relative risks of diabetes were 1.0, 0.99, 0.98, 0.92, and 0.79 (P for trend: 0.0089) across quintiles of whole-grain intake; 1.0, 1.09, 1.00, 0.94, and 0.78 (P for trend: 0.005) across quintiles of total dietary fiber intake; and 1.0, 0.81, 0.82, 0.81, and 0.67 (P for trend: 0.0003) across quintiles of dietary magnesium intake. Intakes of total carbohydrates, refined grains, fruit and vegetables, and soluble fiber and the glycemic index were unrelated to diabetes risk.

Conclusion: These data support a protective role for grains (particularly whole grains), cereal fiber, and dietary magnesium in the development of diabetes in older women.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aged
  • Aging*
  • Blood Glucose / metabolism
  • Body Constitution
  • Body Mass Index
  • Cohort Studies
  • Diabetes Mellitus, Type 2 / epidemiology*
  • Dietary Carbohydrates / administration & dosage*
  • Dietary Fiber / administration & dosage*
  • Edible Grain
  • Female
  • Fruit
  • Humans
  • Iowa
  • Magnesium / administration & dosage
  • Middle Aged
  • Prospective Studies
  • Risk Factors
  • Vegetables
  • Women's Health

Substances

  • Blood Glucose
  • Dietary Carbohydrates
  • Dietary Fiber
  • Magnesium