Prospective associations of fasting insulin, body fat distribution, and diabetes with risk of ischemic stroke. The Atherosclerosis Risk in Communities (ARIC) Study Investigators

Diabetes Care. 1999 Jul;22(7):1077-83. doi: 10.2337/diacare.22.7.1077.

Abstract

Objective: We tested the hypothesis that diabetes, body fat distribution, and (in nondiabetic subjects) fasting insulin levels are positively associated with ischemic stroke incidence in the general population.

Research design and methods: As part of the Atherosclerosis Risk in Communities (ARIC) Study, we measured diabetes by using fasting glucose criteria, waist and hip circumferences, and fasting insulin levels with a radioimmunoassay in > 12,000 adults aged 45-64 years who had no cardiovascular disease at baseline. We followed them for 6-8 years for ischemic stroke occurrence (n = 191).

Results: After adjustment for age, sex, race, ARIC community, smoking, and education level, the relative risk of ischemic stroke was 3.70 (95% CI 2.7-5.1) for diabetes, 1.74 (1.4-2.2) for a 0.11 increment of waist-to-hip ratio, and 1.19 (1.1-1.3) for a 50-pmol/l increment of fasting insulin among nondiabetic subjects. Ischemic stroke incidence was not statistically significantly associated with BMI (comparably adjusted relative risk = 1.15, 95% CI 0.97-1.36). With adjustment for other stroke risk factors (some of which may mediate the effects of diabetes, fat distribution, and hyperinsulinemia), the relative risks for diabetes, waist-to-hip ratio, and fasting insulin level were 2.22 (95% CI 1.5-3.2), 1.08 (0.8-1.4), and 1.14 (1.01-1.3), respectively.

Conclusions: Diabetes is a strong risk factor for ischemic stroke. Aspects of insulin resistance, as reflected by elevated waist-to-hip ratios and elevated fasting insulin levels, may also contribute to a greater risk of ischemic stroke.

Publication types

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

MeSH terms

  • Adipose Tissue / anatomy & histology*
  • Adult
  • Blood Glucose / analysis
  • Body Constitution
  • Body Mass Index
  • Brain Ischemia / epidemiology*
  • Cohort Studies
  • Diabetes Mellitus / epidemiology*
  • Diabetes Mellitus / physiopathology
  • Fasting
  • Female
  • Humans
  • Incidence
  • Insulin / blood*
  • Male
  • Middle Aged
  • Prevalence
  • Risk
  • Risk Factors
  • United States / epidemiology

Substances

  • Blood Glucose
  • Insulin