Is Whey (Liquid) Acidic or Alkaline?
Whey (liquid) (raw) is alkaline: Negative PRAL: alkalizing after digestion.
Classification
Liquid whey is slightly alkaline at −1.9 per 100 ml, because in cheesemaking the potassium stays in the whey, while most of the protein and phosphorus goes into the cheese. That makes it the alkaline half of milk. At 22 kcal per 100 ml, it's light, and a 250 ml glass adds about −5.
In the Dairy category, whey (liquid) (raw) ranks #2 of 25, sorted from alkaline to acid-forming. More alkaline options include Whole milk powder (−6.0). More acid-forming are Skimmed milk powder (−0.9), Whipping cream (−0.2), Buttermilk (−0.1).
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.
Goes well with
Frequently Asked Questions
Is whey (liquid) 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: Whey (liquid) (raw) has a PRAL of −1.9 per 100 ml, so it counts as alkaline in your daily acid-base balance.
How much whey (liquid) do I need for a noticeable effect?
A cup (150 g) of whey (liquid) adds −2.9 to your daily balance. For comparison: an egg is around +5.4, a slice of cheese around +6. So one serving of whey (liquid) roughly offsets one of them.
Why is whey (liquid) alkaline even though it tastes sour?
The PRAL depends on the minerals left over after digestion, not on taste or pH. Whey (liquid) provides more potassium, magnesium and calcium than phosphorus and protein, so the balance is negative (−1.9).
Whey (Liquid) 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 Dairy: Dairy 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.