Natto has 19.4 g protein and a uniquely sticky texture from fermentation. Bacillus subtilis fermentation produces nattokinase, studied for fibrinolytic activity. A Japanese cohort study (BMJ 2020, n = 92 915) linked natto consumption to lower cardiovascular mortality.
How should I track Natto (fermented soybeans)?
Natto (fermented soybeans) is high in iron. Plant-based foods like Natto (fermented soybeans) often come with variable water content, so weighing after draining or pressing gives you the most accurate count. Tofu blocks, for example, can vary by 30% in weight depending on how much liquid they hold. A meta-analysis of 43 RCTs (Reid-McCann et al., Nutr Rev 2025) found that soy protein matches dairy protein for muscle outcomes, so the tracking precision matters just as much as with animal sources. Also watch for marinated or flavored versions — sauces add calories that are easy to miss.
