Legumes are toxic to humans due to lectins and digestive enzyme inhibitors, and their association with Blue Zone health is likely genetic, not dietary.

“beans are highly toxic to humans and it's in the greatest irony is that there's this wildly inaccurate association with health because of the misunderstanding of Blue Zones as you know longevity centers based on what people are eating if you actually look at the Blue Zones they're probably based on clusters of genetic polymorphisms which are favorable rather than anything that people are eating and you know if you look at the Blue Zones people are not incredibly healthy there was recently a fascinating study published looking at the sperm quality of people in Loma Linda and it was abysmal you know so the sperm the sperm motility the sperm numbers were much decreased in the vegetarians in the vegans in Loma Linda so the idea that blue zones are healthy is just this fallacy if people are living longer in blue zones and maybe because of their genetic polymorphisms that give them a advantage rather than anything about the food they're eating but legumes highly toxic to people lots of lectins”