Fried food is high in fat and can lead to stomach aches and diarrhea. In addition, fried food has also been associated with acid reflux
Sugar alcohol
Candy, gum, and other sugar-free foods with sugar alcohols might produce gas and upset stomach. Check the ingredients for "-ol" sweeteners such sorbitol, mannitol.
High fructose corn syrup
High fructose corn syrup, used in candies and pastries, can induce gas, diarrhea, bloating, and cramps.
Citrus fruit
Oranges, grapefruits, lemons, and limes are acidic and can cause heartburn. Citrus foods relax the esophageal sphincter, allowing acid to enter and produce heartburn.
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Peppermint
Peppermint causes heartburn and indigestion in some people. Peppermint relaxes the stomach-esophageal sphincter.
Bean
They're helpful for the gut since they're not digested in the stomach or upper intestine and fermented by good bacteria in the colon.
Cruciferous vegetable
Cabbage, broccoli, kale, and collard greens are cruciferous vegetables. They include beans' sugars, which cause gas, stomach pain, and bloating.
Spicy food
Spicy food can trigger heartburn and acid reflux in some people. Spicy food relaxes the stomach-esophagus sphincter.