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How to avoid acidic foods 
Watch out for acidic fruits and vegetables. 
Many types of fruit are naturally acidic, especially those that taste sour or tangy. While most vegetables are not particularly acidic, canned or pickled veggies are often acidified as part of the preservation process.
If you're trying to cut back on acidic foods, a few fruits and vegetables to watch out for include : Citrus fruits, such as grapefruits, oranges, tangerines, lemons, and limes. Apples, especially tart varieties like granny smith.