A National Institutes of Health-supported study provides some of the first clues about the impact of sustained calorie restriction in adults. Results from a two-year clinical trial show calorie restriction in normal-weight and moderately overweight people failed to have some metabolic effects found in laboratory animal studies. However, researchers found calorie restriction modified risk factors for age-related diseases and influenced indicators associated with longer life span, such as blood pressure, cholesterol, and insulin resistance. The study was reported in the September, 2015 issue of the Journal of Gerontology: Medical Sciences.