Whole grains such as wheat and oats contain fiber, raffinose, and starch. All of these are broken down by bacteria in the large intestine, which leads to gas.

Can cereals cause gas?

Many carbohydrates can cause stomach gas, as they can be tough for the digestive system to process. Some common high-fiber foods that can cause excessive gas include: Beans. Whole-wheat products, such as cereals, breads, and pastas.

Why do Cheerios make me gassy?

Very simple: sugar is a main component of Cheerios. Sugar feeds yeast that are found in most people’s guts. Yeast makes gas. Eliminate sugar entirely from your diet for 6 weeks, and take a good quality probiotic.