Answer:
Over consumption of starches and other foods are the main cause of gas in the gastrointestinal tract. It means you are overeating beyond the digestive tracts capacity of your upper GI tract. These undigested nutrients enter the bacteria laden small and large intestine and the bacteria produce the gas as a result of incomplete digestion.
Some people have intestinal gas as a result of swallowing air while they are eating. This leads to an odorless expulsion of gas.
Take a symethecone tablet, that will collapse the bubbles making it more comfortable.