main thing that changed in the last 30 years is feeding animals on soy and corn, everything containing rapeseed oil, HFCS (from corn) and soy in general in everything, everything low in saturated fat, and everyone surrounded by wireless radios in the 1-5ghz microwave band, and bathed in light high in blue and ultraviolet with a constant 50 or 60hz flicker.

i'm sure there's no connection between these things though. because The Science said so.