Is Whole Rye Flour Acidic or Alkaline?
Whole rye flour (raw) is slightly acid-forming: Positive PRAL: acid-forming after digestion.
Classification
Whole rye flour comes in at +1.6, only slightly above light rye flour (+1.1). The outer layers milled into it do bring more phosphorus, but also more potassium and magnesium, which almost offset it. If you bake at home, this gives you a whole-grain base that weighs hardly more in terms of minerals than the light flour and provides considerably more fiber.
In the Grains, Bread & Pasta category, whole rye flour (raw) ranks #14 of 121, sorted from alkaline to acid-forming. More alkaline options include Parboiled rice (+1.5), Garlic bread (+1.4), Schupfnudeln (potato noodles) (+1.3). More acid-forming are Wholemeal crispbread (+1.6), Crispbread (snack) (+1.7), Rye crispbread (+1.7).
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.
What balances whole rye flour
A dry serving (50 g) of whole rye flour adds +0.8 to your daily balance. These three bring it back; the grams shown offset exactly this serving.
Frequently Asked Questions
Is whole rye flour 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: Whole rye flour (raw) has a PRAL of +1.6 per 100 g, so it counts as slightly acid-forming in your daily acid-base balance.
How much lamb's lettuce offsets a dry serving (50 g) of whole rye flour?
A dry serving (50 g) of whole rye flour adds +0.8 to your daily balance. Lamb's lettuce (fresh) has −8.3 per 100 g, so about 10 g of lamb's lettuce offset this serving.
Do I have to avoid whole rye flour on an alkaline diet?
No. What counts is the balance of the whole day, not a single food. Whole rye flour is slightly acid-forming; with enough vegetables, potatoes and fruit on the same plate, the meal stays balanced.
Whole Rye Flour logged, balance checked.
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Compare all Grains, Bread & Pasta: Grains, Bread & Pasta 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.