They just don't get consistency + moderation.  I eat healthy about 90% of the time.  But about once every week to 10 days, I'll "indulge" a meal or two.  Doesn't fuck with me, or make me gain weight.  Because I DON'T OVER DO IT.  They just can't fucking understand it.  Consistency, on average you just eat well., then you can have a cheat meal once in a while and it doesn't fuck you up.  God they're fucking sad.