Are Mature Soybeans Acidic or Alkaline?
Soybeans, mature (boiled) are slightly acid-forming: Positive PRAL: acid-forming after digestion.
Classification
Boiled mature soybeans come in at +1.1, so they're only slightly acid-forming. The bean's high protein content is almost balanced out by its abundant potassium, and the cooking water dilutes it further. Worth noting: as defatted soy flour, the same bean even reaches −11.3. As a side dish or in a stew, it stays unremarkable in mineral terms.
In the Legumes category, mature soybeans (boiled) rank #15 of 26, sorted from alkaline to acid-forming. More alkaline options include Chickpeas (+1.0), Green peas (+0.7), Kidney beans (+0.7). More acid-forming are Chickpeas (+1.7), Kidney beans (+1.9), Chickpeas (+2.4).
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.
What balances mature soybeans
A cooked serving (150 g) of mature soybeans adds +1.6 to your daily balance. These three bring it back; the grams shown offset exactly this serving.
Frequently Asked Questions
Are mature soybeans 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: Soybeans, mature (boiled) have a PRAL of +1.1 per 100 g, so they count as slightly acid-forming in your daily acid-base balance.
How much avocado offsets a cooked serving (150 g) of mature soybeans?
A cooked serving (150 g) of mature soybeans adds +1.6 to your daily balance. Avocado (ripe) has −9.9 per 100 g, so about 20 g of avocado offset this serving.
Do I have to avoid mature soybeans on an alkaline diet?
No. What counts is the balance of the whole day, not a single food. Soybeans, mature are slightly acid-forming; with enough vegetables, potatoes and fruit on the same plate, the meal stays balanced.
Soybeans, Mature 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 Legumes: Legumes 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.