This summer treat is sweet and refreshing, but it is one of the sneakier foods that cause gas and stomach bloat. Watermelon is high in fructose, a naturally occurring sugar that is often incompletely absorbed by our GI system, leading to gas. Experts estimate one in three people suffer from fructose malabsorption.
Scallions (and other aromatics)
Veggies with strong flavors, like scallions (just the white part), garlic, onions, shallots, and leeks (just the white bottom) are high in fructans, a type of fiber made up mostly of fructose molecules, making them foods that cause gas. Humans lack the enzymes to break down fructans, so no one is able to fully digest them, leading to gut problems like gas and bloating. Here are 8 more foods GI doctors always avoid.