Peanuts
Even though peanuts are not certifiably nuts, their nutritional properties resemble that of real nuts so closely that they are commonly referred to as nuts. Peanuts are a great source of concentrated protein -- they are about 20-30% protein. They are also packed with vitamins and are rich in potassium and B vitamins (especially niacin).
Health Benefits: Don't borrow your girlfriend's facemask -- eat peanuts instead! The vitamins in peanuts help maintain healthy skin, and hair, as well as healthy muscle tone. The potassium in peanuts helps regulate the body's water levels and the normal metabolism of food, which prevents cramping, especially during a workout.
You also don't have to worry that eating peanuts will override all those sweaty hours you're putting in at the gym: peanuts are not as fattening as you think: 85% of the fat in peanuts is unsaturated fat, and 50% of this fat is monounsaturated fat, which helps clear the blood of the "bad" LDL (low-density lipoprotein) cholesterol, making your arteries cleaner, and lowering your risk of heart disease.
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