Why did Mac gain all that weight?

Why did Rob gain weight initially? As a dedicated actor to his craft, Rob decided to gain weight for It’s Always Sunny because he thought it would make his character funnier. During the show’s seventh season, he switched his diet and put on about 50 pounds.

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How did Fat Mac lose weight?

All you need to do is lift weights six days a week, stop drinking alcohol, don’t eat anything after 7pm, don’t eat any carbs or sugar at all, in fact just don’t eat anything you like, get the personal trainer from Magic Mike, sleep nine hours a night, run three miles a day, and have a studio pay for the whole thing …