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You might think these healthy foods are good to eat, but for many they create too much gas buildup in the stomach or small intestine, causing bloating and a puffy belly. Watermelon This summer treat is sweet and refreshing, but it could be the sneaky cause of 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. 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. Blackberries Blackberries are rich in antioxidants, but they're also packed with polyols, the main component in sugar substitutes (which are often blamed for abdominal distress). Polyols tend to hang around our digestive system for a long time and usually aren't completely absorbed, which can lead to bloating or excessive flatulence. Artichokes Beware of this veggie if you're trying to battle bloat. It's high in fructans, a fiber that is undigestible and can cause gas and bloating problems.