I remember reading in David Epstein's sports gene book that some people can train for distance running and not get any faster. I wonder if the same is true for some (like myself with weightlighting.I"ve never tried to get bigger in my arms but pushups have always been a struggle). Weldon and I had the nickname of "Twix" in HS - short for "Twin stix."
And as our wives will attest, we've never been conscious about our diets. We are fast food hall of famers.