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.
Meanwhile, the sweet potato, which some people think is healthier than the normal potato, contains more calories and carbohydrates. There are 20.5g of carbohydrate and 84 calories in 100g of sweet potato compared with 15g to 18g and 66 calories in 100g of an ordinary potato. It is also classed as a 'starchy food'.