2. Tomatoes and Citrus Fruits
Due to their high acidity, WebMD says citrus fruits like oranges and grapefruits are considered “classic heartburn foods,” especially if consumed on an empty stomach. Other examples of citrus fruits include lemons, limes, and pomelos.
While not a citrus fruit, tomatoes are another food that people with GERD should avoid eating. They contain citric and malic acid, which Livestrong.com indicates, “can make the stomach produce too much gastric acid,” and if acid levels are too high it can lead to heartburn.