I'd figure it must be some sort of selection bias; something such as those who aren't as into the taste of food, regardless of their tasting aspects, are more l

I'd figure it must be some sort of selection bias; something such as those who aren't as into the taste of food, regardless of their tasting aspects, are more likely to try it. FWIW, back when I was doing the protein shakes and weightlifting thing, I found some protein shakes tasted fine... and others were nasty. The biology of taste is more complex than a simple non-taster < taster < supertaster continuum, that's merely an obvious aspect.