[TRENDING: Seniors sleep in cars waiting for vaccine | How to get vaccine in Fla. | ‘Amen and awoman:’ Backlash over prayer]Tied for second place, the DASH Diet, which stands for Dietary Approaches to Stop Hypertension and the Flexitarian diet which encourages being a flexible vegetarian.Weight Watchers rounds out the top three best overall diets.US News and World Report announced the rankings on Monday after a panel of health experts reviewed research of about 39 different eating plans from medical journals, government reports and other resources..