Whenever I go to bathroom,i am not able to clear my stomach completely.because of this huge gas is created on an average per half an hour.I take healthy diet and roughage food and i do yoga and exercise.i have noticed my friends do not take healthy diets but they do not have gas problems.some four years back i was not taking healthy foods and was not doing exercises but this problem was not there.pls tell reason for this and its cure and what changes i have to bring in life style.