The Dietary Approaches to Stop Hypertension (DASH) diet, which is characterized by high intake of fruits, vegetables, low-fat dairy products, and whole grains, has been shown to reduce blood pressure in trials. Because of the effect on blood pressure and other potential cardiovascular benefits, this eating pattern may reduce the incidence of heart failure. Diet was measured using food frequency questionnaires in 36 019 women aged 48 to 83 years, who were classified by consistency with the DASH diet. The women were followed up for heart failure hospitalization or mortality from 1998 through 2004. Compared with the lowest 25%, women who were in the top 25% based on ranking components of the DASH diet had a 37% lower rate of heart failure (95% confidence interval, 19%-52%). The pattern of the association with heart failure was similar for scores using other strategies to measure consistency with the DASH diet.