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Jiang R, Manson JE, Stampfer MJ, Liu S, Willett WC, Hu FB. Nut and Peanut Butter Consumption and Risk of Type 2 Diabetes in Women. JAMA. 2002;288(20):2554–2560. doi:10.1001/jama.288.20.2554
Author Affiliations: Departments of Nutrition (Drs Jiang, Stampfer, Willett, and Hu) and Epidemiology (Drs Jiang, Manson, Stampfer, Liu, Willett, and Hu), Harvard School of Public Health; the Channing Laboratory (Drs Manson, Stampfer, Willett, and Hu); and the Division of Preventive Medicine (Drs Manson and Liu), Department of Medicine, Harvard Medical School and Brigham and Women's Hospital, Boston, Mass.
Context Nuts are high in unsaturated (polyunsaturated and monounsaturated) fat
and other nutrients that may improve glucose and insulin homeostasis.
Objective To examine prospectively the relationship between nut consumption and
risk of type 2 diabetes.
Design, Setting, and Participants Prospective cohort study of 83 818 women from 11 states in the
Nurses' Health Study. The women were aged 34 to 59 years, had no history of
diabetes, cardiovascular disease, or cancer, completed a validated dietary
questionnaire at baseline in 1980, and were followed up for 16 years.
Main Outcome Measure Incident cases of type 2 diabetes.
Results We documented 3206 new cases of type 2 diabetes. Nut consumption was
inversely associated with risk of type 2 diabetes after adjustment for age,
body mass index (BMI), family history of diabetes, physical activity, smoking,
alcohol use, and total energy intake. The multivariate relative risks (RRs)
across categories of nut consumption (never/almost never, <once/week, 1-4
times/week, and ≥5 times/week) for a 28-g (1 oz) serving size were 1.0,
0.92 (95% confidence interval [CI], 0.85-1.00), 0.84 (0.95% CI, 0.76-0.93),
and 0.73 (95% CI, 0.60-0.89) (P for trend <.001).
Further adjustment for intakes of dietary fats, cereal fiber, and other dietary
factors did not appreciably change the results. The inverse association persisted
within strata defined by levels of BMI, smoking, alcohol use, and other diabetes
risk factors. Consumption of peanut butter was also inversely associated with
type 2 diabetes. The multivariate RR was 0.79 (95% CI, 0.68-0.91; P for trend <.001) in women consuming peanut butter 5 times or more
a week (equivalent to ≥140 g [5 oz] of peanuts/week) compared with those
who never/almost never ate peanut butter.
Conclusions Our findings suggest potential benefits of higher nut and peanut butter
consumption in lowering risk of type 2 diabetes in women. To avoid increasing
caloric intake, regular nut consumption can be recommended as a replacement
for consumption of refined grain products or red or processed meats.
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