An ounce of peanuts is about 28 whole peanuts. A handful of peanuts is also about an ounce, which makes it easy to measure them out.
Peanuts are high in protein, as one-third of their calories come from protein. They also are high in fat, as about two-thirds of their calories are from fat. However, it is mostly fats that are good for the body, as peanuts do not have cholesterol. In fact, some evidence suggests that eating nuts may even lower a person's chances of suffering from heart disease. Peanuts are also high in vitamins, including vitamin E and magnesium.