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Corn, lentils, winter squash and olives are all vegetables that are high in acid. For example, corn has a pH of 5.2, while lentils and olives have pH levels of 6.3 and 6, respectively.They still have fiber and other nutrients, but they are not good choices if you are trying to lower the levels of acid in your body.ll forms of alcohol are high in acid no matter whether they are light or low in calories. Examples of these include beer, wine -- sherry-wine has a pH of 3.4 -- hard liquor, spirits and scotch. Other beverages that are high in acid include soda, coffee and cocoa.
Foods that May Stimulate Acid Production and Increase Heartburn. 1  Caffeinated beverages. 2  Carbonated beverages. 3  Alcohol. Spicy foods.  Black 1  pepper. Citrus fruit and juices (e.g. orange, grapefruit)  Tomato juice.