Why are most non-foods bases? Why are most foods acids?

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Surprising as it sounds, the most acidic foods before you eat them can be the most alkaline.Lemons contain citric acid, 1.87 pH!However, when ingested, all fruits will become alkaline...........in an empty stomach, hence, the lemon becomes 9.0 pH, the most alkaline!Here's a tip to remember: carbon-based foods are acid-forming. Proteins are also acid forming.Alkaline foods usually contain magnesium, potassium, calcium and zinc.Hope it helps.