A good source of dietary fiber, which is important for maintaining overall health. Dietary fiber is the part of the plant that your body cannot digest. Fruits and vegetables are sources naturally high in dietary fiber, as are whole grains, legumes and nuts. Dietary fiber helps by adding bulk to your diet, making you feel full on less food, thus reducing the number of calories you consume. Fiber also helps prevent constipation and helps with digestion. One mediumsized nectarine contains 2.4 grams of dietary fiber.