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Peanut Nutrition. 1  Peanuts and peanut butter are full of nutrition and contain protein, mostly good fats, fiber and more than 30 essential vitamins and nutrients, and fit into a balanced diet. 2  For more resources, jump to the bottom of the page.
Spoon in a jar of peanut butter Photo Credit HandmadePictures/iStock/Getty Images. Protein is an essential nutrient that your body needs. Your body is constantly breaking down proteins in your cells, organs and tissues. Protein from the food you eat, breaks down into amino acids that replace proteins in your body. A complete protein contains all the essential amino acids your body needs to stay healthy. While peanut butter is an excellent source of protein, it is not a complete protein.