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 serving of sweet potato pie -- approximately 4 ounces -- contains 266 calories, according to The National Food Service Management Institute. Many of these calories come from fats and sugars. Although sweet potato pie is a fairly high-calorie treat, youâll get healthy fiber and vitamins with each serving.