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 fries contains 108 mg of sodium or about 4 percent of the daily value for sodium. It also has 282 mg of potassium, which is about 6 percent of the daily value for potassium. A serving of sweet potatoes contains 3 percent of the daily value for iron and 2 percent of the daily value for calcium.