Bananas are not classified among the most common reflux-causing foods. It is much less acidic than citrus fruits or tomatoes, so many people who experience reflux tolerate bananas well.
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However, the reaction to food is individual. A very ripe banana has more sugars, and a larger portion may cause some people to feel fullness or bloating. Increased pressure in the abdomen can create more favorable conditions for stomach contents to rise into the esophagus.