While they might be chockfull of healthy nutrients like lycopene, Chutkan tells WebMD that tomatoes are also highly acidic and likely to cause heartburn in those who are prone to it.

Are raw tomatoes bad for acid reflux?

Tomatoes may be great for heart health, but their high acid content causes them to trigger heartburn. To keep your acid reflux under control, avoid eating fresh tomatoes—and be aware that canned tomatoes, tomato juice, and other tomato products also rank high on the list of GERD foods to avoid.

What is the pH of raw tomatoes?

The pH of fresh tomatoes (3,6,17,19) and canned tomatoes (4,6,11,15) is in the range of 4.0 to 4.6, and rarely outside these values. Molds growing on heated tomato juice raise the pH to 9.0 or more (7,10,13).