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To a dieter, the only thing scarier than trying on a bathing suit is fat. Not all fats, however, are the same. Technically speaking, monounsaturated fats have one double-bonded carbon that’s unsaturated, meaning that it generally doesn’t come from an animal source, according to the American Heart Association. When you eat them in moderation, foods with monounsaturated fats can benefit your health, lower your risk of heart disease and reduce levels of bad cholesterol.