The best controlled research on the subject (where subjects were actually assigned specific diets so researchers could track the results) is still the PREDIMED study, which showed that the Mediterranean diet could reduce cardiovascular events by 25 percent. That's a fairly well-balanced diet rich in fruits, vegetables, and whole grains. As you move up the pyramid, you get lower servings of meat and dairy. And sweets are certainly crammed into the pyramid's tiny tip. It's not a satisfying answer for folks desperate to be told the magic food formula for health and wellness, but it's true: moderation does seem to be key.