Re:Off season for bodybuilders !!
It really depends mate. If your talking about pros then like not the fish said, they eat relativley clean and just increase portion size. Saying that have you seen markus ruhl in off season, he looks like a baloon. He even admits to eating junk. Its just means people who go for that approach will have to diet longer than most.
For recreational bodybuilders e.g. myself, I like to look good all the time. Even though I dont compete I like to diet down for diff things (holidays or special occasions) and when I bulk (off season) ill still do cardio and eat clean which allows me to put on a bit of size but stay in some sort of condition.