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.
Potassium in Sweet Potatoes. One 5-inch raw sweet potato contains about 438 milligrams of potassium. A large, cooked sweet potato in the skin contains more than 850 milligrams. A medium banana, by comparison, contains about 440 milligrams of potassium and a cup of coconut water has about 600 milligrams.