Tomatoes are not acidic foods. 1. The acidity or alkalinity of food is not determined according to the flavor of the food, but according to the acidity or alkalinity of the aqueous solution of the ash obtained from combustion. For example, eggs and meat are acidic because they contain large amounts of carbon, nitrogen, sulfur and other elements, and the ash obtained from combustion is acidic when dissolved in water. 2. tomatoes contain more potassium, magnesium and other trace elements, after burning the ash dissolved in water is more alkaline, so tomatoes are not acidic food. Similarly, many vegetables and fruits are rich in potassium, calcium, sodium, magnesium and other minerals, so vegetables and fruits are mostly alkaline food.