High in protein, fiber, and vitamin E, almonds are great for your heart, digestive system, and skin. Although they're also loaded with healthy unsaturated fats, some guys avoid them because they're so calorie-dense. But that's a mistake. Gary Fraser, Ph.D., a professor of medicine at Loma Linda University in California, studied folks who added two ounces of almonds to their diet on a regular basis. Turns out they had no significant weight change. "Since nuts are such a hard food, it appears that a significant amount of their calories are never absorbed into the body," he says. To work more almonds into your diet, try keeping a bag of dry-roasted or lightly seasoned almonds in your desk drawer at work-and snack on a handful rather than hitting the vending machine. You can also blend almond butter into smoothies, or use it in place of peanut butter to make an, uh, AB&J sandwich.