Depending on your definition (and goals), you have a variety of options and Rick and Kate have the scoop for you. Want to eat for health and longevity? They'll tell you how. Want to lose weight fast? Gotcha. Spoiler: the winner is not new or a fad. Kate and Rick discuss US News and World Report’s 2020 ranking of the best diets. Find out what came in on top, and what popular diets faced stiff competition. Some diets are considered effective for quick weight loss and others for their health. You may not be surprised to find out what they have in common.