Are White Grapes Acidic or Alkaline?
White grapes (fresh) are alkaline: Negative PRAL: alkalizing after digestion.
Classification
White grapes are alkaline at −3.8, driven by the potassium in the flesh, with hardly any protein or phosphorus. Red grapes are practically the same at −3.5. As a snack next to a cheese board, 100 g of grapes offset a 30 g slice of Tilsit cheese by a good two-thirds. The value says nothing about the fruit sugar behind the 72 kcal.
In the Fruit category, white grapes (fresh) rank #39 of 80, sorted from alkaline to acid-forming. More alkaline options include Mirabelle plum (−3.8), Pomegranate (−3.8), Lemon (−4.0). More acid-forming are Sweet cherry (−3.7), Mangosteen (−3.6), Quince (−3.6).
Acidic or alkaline: PRAL, not pH
On this site, acidic and alkaline refer to the PRAL (potential renal acid load). It estimates what a food leaves behind once it has been digested: a positive value is acid-forming, a negative value is alkalizing. That is different from the pH of the food itself: a lemon tastes sour, yet its PRAL is −4.0, so it is alkalizing. Your diet does not change your blood pH. It does change how much acid your kidneys have to deal with.
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Frequently Asked Questions
Are white grapes acidic?
It depends on what you mean by acidic. The pH describes the food itself, for example how sour it tastes. The PRAL describes what it leaves behind after digestion: White grapes (fresh) have a PRAL of −3.8 per 100 g, so they count as alkaline in your daily acid-base balance.
How much white grapes do I need for a noticeable effect?
One piece or a handful (120 g) of white grapes adds −4.5 to your daily balance. For comparison: an egg is around +5.4, a slice of cheese around +6. So one serving of white grapes roughly offsets one of them.
Why are white grapes alkaline even though they taste sour?
The PRAL depends on the minerals left over after digestion, not on taste or pH. White grapes provide more potassium, magnesium and calcium than phosphorus and protein, so the balance is negative (−3.8).
White Grapes logged, balance checked.
Basentracker adds up every meal automatically and shows whether your day is in the alkaline range. The same values as on this page, all 977 foods, photo scan, recipes.
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Compare all Fruit: Fruit table. Common questions are answered in Acidic or Alkaline?, and the PRAL calculator adds up a whole meal.
Source: Basentracker food database (PRAL according to Remer & Manz, calculated from protein, phosphorus, potassium, magnesium and calcium per 100 g). This information does not replace medical advice.