Overview - In total, 48,835 women 50-79 years of age at baseline participated in the WHI Dietary Modification (DM) Trial from 1994-2005, with women being randomized from 1994-1998. Participants in the DM Trial were randomized to one of two study groups:
Intervention arm (Dietary Change group) (n=19,541): These women were asked to lower their fat intake to 20% of energy, increase fruit/vegetable servings to five or more daily, and increase grain servings to six or more daily. The intervention did not include a weight loss component, though on average, women did lose a modest amount of weight. Groups of 8-15 participants attended nutritionist-facilitated sessions to learn how to lower their dietary fat intake and increase their fruit and vegetable and grain intake. They also learned how to maintain the changes.
Control arm (Usual Diet or Comparison group) (n=29,294): These women were not asked to make any dietary changes, but were given a copy of the Dietary Guidelines for Americans for general nutrition information.
Findings - To learn more about some of the main findings from the WHI Dietary Modification Trial, see these summaries of scientific publications:
Additional Information - Visit Questions and Answers about the WHI Dietary Modification (DM) Trial for additional details about the study and its findings.