Small, red, slightly sweet bean. One cup cooked provides 17g protein, 17g fiber (the highest fiber density of any common legume), 30% DV folate, 14% DV iron, 29% DV phosphorus. Contains condensed tannins and proanthocyanidins — polyphenols documented to inhibit alpha-amylase and alpha-glucosidase (reducing starch digestion), support kidney health, and reduce inflammation.
Available at Asian, Caribbean, and health food stores. Bob's Red Mill carries dried adzuki beans at mainstream stores. Growing availability. Affordable.
For the APOL1 kidney disease risk that is disproportionately concentrated in Black Americans (20% of Black Americans carry two APOL1 risk variants, dramatically increasing CKD risk), adzuki beans provide a targeted dietary intervention. The proanthocyanidins in adzuki beans reduce mesangial cell proliferation (kidney cell overgrowth associated with CKD progression) and reduce proteinuria in animal models. For T2DM: the fiber at 17g/cup (highest of any common legume) combined with the alpha-amylase inhibition from condensed tannins produces one of the lowest glycemic responses of any bean — significantly blunting post-meal blood glucose even in high-carbohydrate meals.
Cook like any dried bean: soak overnight, drain, simmer 45-60 minutes until tender. Available canned (no soak needed — rinse before use). Use in soups, stews, grain bowls. Japanese use: sweetened adzuki paste (anko) in desserts. APEX use: savory applications in soups and rice dishes.
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