Yes, there are some cultures with extremely long-lived people that are reliant on soy, like Japan, for example. However, there is a reason why Americans shouldn’t eat as much soy as our Asian counterparts. Most of our soy is genetically modified, and we don’t know how that could negatively impact us in the long-term. Furthermore, soy has been shown to spike inflammation in the body and inhibit thyroid function. For women with a history of breast cancer in the family, you might also want to limit your soy intake. Soy has been proven to act as a phytoestrogen in the body, which could accelerate cancer growth for those who are prone to it.