Usually, it's normal to fart up to half of a gallon (1.9 liters), or about 15 to 20 toots worth of gas, each day. In this case, you may check food you have taken. The biggest gas-generating ingredients are sugars, as the following.
Fructose – A natural ingredient in plants like onions, corn, wheat and even pears. It's often concentrated into a sugary syrup for soft drinks and fruit drinks.
Lactose – Milk's sweet natural ingredient, also added to foods like bread and cereal. Some people are born with low levels of lactase, the enzyme that breaks down lactose, a fact that inflates their gassy susceptibility.
Raffinose – The secret gassy ingredient in beans, which is also found in broccoli, cauliflower, cabbage, asparagus and other vegetables. Products like Beano, designed to reduce gas production, break down the sugar before it can reach eager intestinal bacteria.
Sorbitol – Found in almost all fruits, this indigestible sugar is also used as an artificial sweetener in "diet" and sugar-free foods. Yes, sugar-free gum, candy, soda and anything else deceptively sweet can cause gas.
...Chronic irritating or painful gas may signal something serious, however, seeing a gastrointestinal specialist is a good idea if this is the case.
