A recent Harvard study found that several foods, including yogurt, nuts and grains, actually reduced weight gain over time in adults.
A thick filet of fish is a good substitute for red meat, which the Harvard study found to be a source of weight gain in adults. This halibut and mango salsa recipe also blends in a serving of fruit with healthy fruit salsa. Serve with a whole grain side for a complete meal. Mark Gail/The Washington Post