Other causes of stomach rumbles: 1  Incomplete digestion of food can lead to excess gas in the intestine. 2  Louder rumbles may occur when one is hungry. 3  Stomach rumbles can form further along the gastrointestinal system when air is swallowed while talking, eating, and drinking.
One cup of raw yams contains about 158 calories, whereas 1 cup of raw sweet potatoes contains about 114 calories. Therefore, yams contain about 44 more calories than sweet potatoes for an equal portion.
Each sweet potato also supplies 7.5 grams of fiber, with 25 percent of the fiber located in the skin. The Institute recommends that women consume 25 grams of fiber daily in order to improve your digestive health and lower your risk of obesity, cardiovascular disease and colon cancer.