What we eat affects how we feel. How food moves through our digestive tract and the secretions it produces are affected by the protein, carbohydrate and fat composition of our foods. Because 70 percent of the cells that make up the body's immune system are found in the wall of the gut, what we eat also may affect the body's immune response. Moreover, the normal bacteria in our large intestine contribute to bloating and gas production when carbohydrates, such as lactose and fructose, are not completely absorbed in the small intestine.
Eating whole foods instead of refined or processed foods is good for everyone. Processed foods are convenient, but to make them taste better, manufacturers use chemical additives and high fructose corn syrup, a sweetener that is often not absorbed well, resulting in bloating and abdominal discomfort.