This year's rankings place the Mediterranean diet in first place, closely followed by the DASH diet (they tied for first last year). You could probably come up with the guidelines for both without doing any Googling, because they're basically just "eat the foods you're always told to eat." Focus on fruits, veggies, fish, lean meats, and whole grains. Cut back on sugar and starches. DASH stands for Dietary Approaches to Stop Hypertension, because it was originally designed to, you guessed it, lower hypertension. The next four diets—flexitarian, Weight Watchers, MIND, and the Mayo Clinic diet—are all essentially variations on that theme. MIND stands for Mediterranean-DASH Intervention for Neurodegenerative Delay and does exactly what the name implies, while the rest are intended as general nutritional recommendations—Weight Watchers has gradually moved from straight calorie counting to a plan that encourages users to eat as much of certain foods as they need to feel good.