4. Tomatoes
Tomatoes are packed with antioxidants and beneficial nutrients such as lycopene. However, they are also highly acidic. Foods with a low pH range are highly acidic, and tomatoes are typically between 4.3 and 4.9 on the pH range scale.
The acidity in tomatoes causes the stomach to produce more gastric acid. The result is that it may not all be contained and can flow back up into the back of the throat causing the familiar sour, burning sensation, and taste. Some gastroenterologists speculate that to counter the acidity in tomatoes, you could eat a sour ball. Sour balls stimulate saliva, and this neutralizes the acid. In avoiding tomatoes, you should also avoid tomato sauces and ketchup, tomato relish and foods with a lot of tomatoes, such as pizza or tomato-based curries, stews, and pasta.