Some people suffer heartburn from oranges, grapefruits, lemons, and limes. Citrus meals loosen the esophageal sphincter, letting acid cause heartburn.
Sugar alcohol
Candy, gum, and other sugar-free foods made with sugar alcohols can cause gas and upset stomach in some folks.
High fructose corn syrup
High fructose corn syrup is a sweetener used to make candy and pastries, and it can cause gas, diarrhea, bloating, and cramps in some folks.
Cruciferous vegetable
Cabbage, broccoli, kale, and collard greens are cruciferous vegetables. They include sugars like beans that cause gas, bloating, and stomach pain.
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Bean
Oligosaccharides, fermentable fibers in beans, can induce gas, bloating, and stomach pain. Because they bypass the stomach and enter the colon, they're good for the gut.
Spicy food
Spicy food relaxes the sphincter (valve) between the stomach and esophagus, allowing acidic food to reflux into the esophagus and cause heartburn.
Fried food
Fried food is high in fat and can lead to stomach aches and diarrhea.
Chocolate
Like peppermint and citrus fruit, chocolate relaxes the esophageal sphincter, causing heartburn and indigestion. It depends on the person.