Some common causes of stomach bloating include overeating, eating too fast, and eating rich and fatty foods, according to WebMD. Another common cause of bloating is gas in the abdomen.
Foods rich in fats take longer to digest, which keeps the stomach full longer, notes WebMD. Particular foods that are difficult to digest, such as beans and lentils, certain fruits and vegetables that contain sugars and starches, dairy products, and sweeteners, can also cause bloating. Eating too fast can lead to overeating as the brain takes approximately 20 minutes to receive satisfaction signals. Swallowing air leads to gas accumulation in the intestines that causes bloating if the gas does not move through the gastrointestinal tract effectively enough. Habits such as drinking through straws, chewing gum and sucking on hard candy increase the amount of swallowed air.