>>76507398
>>76507410
Fat cells shrink or expand as you lose/gain fat. But they have a maximum size. So if you gain so much fat that they are all at capacity, they eventually become unstable and will split to form new fat cells. Then when you lose weight again, you keep all those new fat cells around.
That's why former fatties have to stay on top of their diet for the rest of their lives. They've got all those extra cells sending signals for food that they wouldn't have had otherwise. So if they just wing it, chances are they blow back up.
We all have to pay for our sins, including gluttony.
>>76507068 (OP)
Yes, its easier to bounce back if you've trained in the past. I was a fat-ish teen. Then I was really fit in the military. Not hugely jacked, but lean and pretty strong, since endurance was typically more useful than raw strength alone. I got fat again after I got out and stopped working out and resumed eating like shit. Took ~11 months to drop the fat after that seven-year detour as a lardass, but once I got back in the gym, muscles all came back pretty quickly.