May 30, 2022 · The most acidic fruits are lemons, limes, plums, grapes, grapefruits and blueberries. Quinoa, rice and oats are just a few examples of whole grains. Apr 08, 2021 · They also come in varieties like juice and dried grapes, among others. However, when metabolised they have an alkaline-forming effect on the body, and so are to be classified as alkaline forming fruits. .