Everything is, but in terms of factors, eating enough is more within control, i.e. the excessive GOMAD prescription, gallon of milk a day. Mostly diet genetics

Everything is, but in terms of factors, eating enough is more within control, i.e. the excessive GOMAD prescription, gallon of milk a day. Mostly diet genetics becomes an consideration when you're at the extreme ends of weight goals, like dietting down to unhealthy bodyfat levels or trying to cram 8,000 calories a day to maintain in the heavier weight classes (250lbs+). Compared to genetic propensity for gaining muscle or one's training response, conscientiousness to train consistently - eating habits for most "hard gainers" is current diet + a few spoonfuls of peanut butter a day.