Analysis of traditional Blue Zone diets reveals consistently high dietary spermidine intake compared to typical Western diets. Okinawan diets (high natto, tempeh, soy) and Sardinian diets (aged Pecorino, legumes, whole grains) are particularly spermidine-rich. The Viennese mortality study (Kiechl 2018) provides direct evidence linking dietary spermidine levels to the mortality reductions observed in these populations.

Is diet or supplements more important for spermidine intake?

Ideally, both. A spermidine-rich diet provides the compound in a food matrix with complementary polyamines, fiber, and phytonutrients. Supplements ensure consistent therapeutic dosing when dietary adherence is imperfect.

Does cooking traditional Blue Zone foods reduce their spermidine?

Yes. Extended boiling of beans, for example, reduces spermidine by 20–40%. Traditional cooking methods (bean stews, slowly cooked grains) retain more spermidine than rapid boiling. Fermented and aged foods retain spermidine very well.