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.
A half-cup serving of sweet potato without skin contains 4 grams of fiber, about 16 percent of the daily recommended intake of 25 grams of fiber for women, and 11 percent of the daily recommended intake of 38 grams of fiber for men. Soluble fiber, found inside plant cells, is one of the two main types of fiber.