Which foods cause intestinal gas?

Lactose - Milk and milk products such as cheese and ice cream, as well as some processed breads, cereals and salad dressings, contain the sugar lactose. While most people can digest lactose with no difficulty, some have trouble because they don't produce any or enough of the enzyme lactase, which splits lactose into digestible parts. Without lactase, milk and other lactose-rich foods ferment in the intestine, releasing excessive gas. People of African, Asian and American Indian descent are most likely to be deficient in lactase.
Fructose - Onions, artichokes, pears, wheat, and some soft drinks and processed foods contain this sugar, which may be difficult to digest.
Sorbitol - Apples, pears, peaches, prunes, and some sugar-free foods, candies and chewing gum contain the sugar alcohol sorbitol, another compound that's hard to digest.
Raffinose - This sugar is found in beans, cabbage, brussels sprouts, broccoli, asparagus and whole grains.
Rice is the only starch absorbed almost completely by the small intestine. Because rice starch never reaches the large intestine, gas-producing bacteria don't break this starch down. But other starches, including potatoes, corn, noodles and wheat, are gas producers.
Dietary fiber - found in beans and wheat bran, also tends to produce gas. When research subjects ate a diet in which half of their calories came from pork and beans, they experienced a tenfold increase in their normal gas production.

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