8 Foods That Can Give You Gas

Most people know that beans tend to cause more gas than other foods. This is because beans contain oligosaccharides, including raffinose. These are large sugar molecules that cannot be broken down or digested in the small intestine. The sugar then passes undigested into the colon, where it is fermented by your "good" bacteria, and gas is produced as a byproduct.

Mushrooms, like beans, contain the oligosaccharide sugar raffinose. Eating mushrooms can cause gas because raffinose is not fully digested in the small intestine, but instead undergoes fermentation in the large intestine. The gas produced by fermentation will then exit as intestinal gas.

If you're one of the many adults who are lactose intolerant, dairy products can cause a significant amount of gas and bloating. People who are lactose intolerant lack the enzyme lactase, which is necessary to break down lactose (milk sugar). This results in gas and bloating, among other symptoms. Besides milk itself, dairy products such as ice cream, cheese, and yogurt contain lactose and there may be dairy ingredients in other products.

Note that lactose intolerance is different than a true milk allergy. People with a milk allergy should avoid milk in any form, at all times.

Wheat is not often thought of as a food that causes gas. However, the starch in wheat creates gas when it is broken down in the large intestine by your good bacteria. Whole wheat and bran, in particular, may be the culprits.

Wheat also contains fructose, a natural sugar that is can be found in fruit. Any undigested fructose from wheat may ferment in the large intestine and lead to gas.

Apples, apricots, cherries, peaches, pears, plums, and prunes are especially well-known for causing excess gas. Apple juice, pear juice, and fruit drinks are also culprits. The reason is that fruit (like wheat) contains fructose.

If you ingest more than your body can digest, the remaining fructose is broken down by fermentation. A byproduct of fermentation in the large intestine is gas.

These healthy vegetables are also notorious for causing gas. The fiber in them is not completely digested in the small intestine. When the good bacteria in the large intestine go to work digesting it, gas is created as a result.

Eating large amounts of these vegetables will cause more gas. Some people find that eating small amounts and increasing the amount slowly over time may help reduce the amount of gas.

Other vegetables that often cause gas include asparagus, artichokes, and onions.

Many foods labeled as "sugar-free" or "diet" often contain sweeteners such as xylitol, mannitol, sorbitol, or erythritol. These are naturally-occurring sugars that are added to foods and drinks to make them sweeter.

High-fructose corn syrup can produce gas as the fructose is acted on in the gut. Many sweetened drinks and sodas are made with high-fructose corn syrup instead of sugar. The effects can be even worse if it's in a carbonated drink, as that causes you to introduce additional gas into your intestinal tract. If you don't burp it out, it will come out the other end.