Subjects who used olive oil as a prominent source of fat in their diet had similar results. A recent study at Purdue University showed that higher fat foods like peanuts and peanut butter were more satisfying than a high carbohydrate snack, like rice cakes. The peanut-eaters felt full sooner, self adjusted their caloric intakes, and did not add extra calories to their daily diets. Peanuts and peanut butter contain numerous constituents that may contribute to these protective benefits. In addition to heart-healthy monounsaturated fat, peanuts contain plant protein, vitamin E, fiber, folic acid, magnesium, copper, potassium, and many other hard to get nutrients.
Peanuts contain more arginine than any other nut.
This plant protein is a precursor to nitric oxide, a chemical which expands blood vessels and inhibits the build-up of cells that can clog blood vessels. Peanuts also contain resveratrol, a plant chemical also found in red wine, which studies have shown to have a protective effect against cancer and heart disease. Research done at the University of Illinois shows resveratrol to be one of the most potent phytochemicals. Peanuts contain the antioxidant vitamin E, which has been associated with a lower risk of heart disease. And, since they are a plant food, peanuts naturally contain no cholesterol.