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One of the most common causes is poor diet. A diet high in animal fat and low in vegetables and fruit can lead to constipation. Not drinking enough fluids may also cause the stool to become hard. Certain medical conditions, such as irritable bowel syndrome or hormone abnormalities, may lead to constipation.
Foods high in soluble fiber are likely to cause gas, because soluble fiber breaks down slightly in your colon. Soluble fiber-rich foods include some fruits, oatmeal and beans. Several high-fiber foods contain natural sugar that causes gas during digestion. Avoid fruits high in fructose such as bananas, apples, dried fruits, grapes and apricots. Several types of vegetables, including onions, cabbage, broccoli and Brussels sprouts, are full of a complex carbohydrate called oligosaccharides.