These bacteria live peacefully in our bowel and provide certain positive health benefits to the body. Most bacteria in the colon are harmless and cause no problems. These bacteria rely on the indigestible food we eat for their own nutrition. Certain foods are more likely to cause certain bacteria to thrive. They generate gases such as hydrogen and methane.
Gas forming bacteria generally feed on certain carbohydrates and sugars.
So, if these carbohydrates are reduced or eliminated from the diet, rectal gas can usually be significantly reduced. Individual response to certain foods is also a factor in producing rectal gas. For instance, two people can eat the same amount of the same carbohydrate. One forms large amounts of rectal gas, while the other experiences little or none. Refer to the chart, Foods that Contribute to Gas Production.