Are Red Grapes Acidic or Alkaline?
Red grapes (fresh) are alkaline: Negative PRAL: alkalizing after digestion.
Classification
Red grapes are at −3.5 and alkaline because they supply plenty of potassium with almost no protein. White grapes come in at −3.8, so color hardly matters for the balance. A 150 g bowl adds about −5. Grape juice is much weaker at −1.8 per 100 ml because pressing and clarifying lose potassium.
In the Fruit category, red grapes (fresh) rank #43 of 80, sorted from alkaline to acid-forming. More alkaline options include Quince (−3.6), Mangosteen (−3.6), Sweet cherry (−3.7). More acid-forming are Mulberry (−3.4), Peach (−3.4), Pomelo (−3.4).
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 red 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: Red grapes (fresh) have a PRAL of −3.5 per 100 g, so they count as alkaline in your daily acid-base balance.
How much red grapes do I need for a noticeable effect?
One piece or a handful (120 g) of red grapes adds −4.2 to your daily balance. For comparison: an egg is around +5.4, a slice of cheese around +6. So one serving of red grapes roughly offsets one of them.
Why are red grapes alkaline even though they taste sour?
The PRAL depends on the minerals left over after digestion, not on taste or pH. Red grapes provide more potassium, magnesium and calcium than phosphorus and protein, so the balance is negative (−3.5).
Red 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.