Salmon is a rich source of vitamin D and one of the best sources of omega-3s you can find. These essential fatty acids have a wide range of impressive health benefits—from preventing heart disease to smoothing your skin and aiding weight loss to boosting your mood and minimizing the effects of arthritis. Unfortunately, many Americans aren’t reaping these perks because we’re deficient, which some experts believe may be at the root of many of the big health problems today, like obesity, heart disease, and cancer. Omega-3s also slow the rate of digestion, which makes you feel fuller longer, so you eat fewer calories throughout the day.