I thought soybeans were supposed to be bad for you.
Asians have known for centuries (if not millennia) that legumes, especially soy, are difficult to digest.
Compared to faddish American vegetarians/vegans, they actually consume less soy, and consume more of it in the highly fermented (pre-digested) forms.
Natto is highly fermented. It also can be made from other legumes, such as chickpeas (although what you would find in a Japanese market would probably be from soy).
Regular GMO soybeans are bad for you. But the experts say fermented organic soybean products are like miracle drugs.
I ferment turmeric and ginger, sauerkraut, kombucha, pickles and make kefir every day. I like all these things and I think it’s enough.