Over 5 litres of gas are produced each day in the normal gut. When normal digestive function is interrupted or hindered, changes in chemical reactions or the way gut bacteria work lead to increased amounts of gas being produced.
Several types of food can cause flatulence in some people but not in others. It depends not only on the presence in the large intestine of the right bacteria for the right food, but also on a sufficient quantity of bacteria to digest it. Bitter herbs have been used for many years as digestive tonics.