This is pretty spot on.
(media.omegacanada.win)
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Soy came about in the 30s and levels started falling before the 70s.
It seems there is a lot at play. Pesticides, phytoestrogens in processed food like soy, plastics acting as estrogens, and metalloestrogens.
Reduction in physical activity, reduction in sleep, and selection for “sensitive” males.