[mdekkers]

The question you need to answer is can you sustain this for the remainder of your lifespan.

He doesn't have to, as he is now at his target weight. He only needs to maintain his current body weight, which isn't the same thing.

[0xbear]

It is the same thing if he his insulin homeostasis is out of whack. It's a constant struggle in that case. That's why most people who lose weight in the short term gain it right back when they "maintain".

A thin dude at work pretty much only eats junk food and washes it down with regular coca cola, of which he drinks 3-4 cans a day. Every single day. Doesn't exercise much either. And he doesn't gain weight. For me, god forbid I eat a single donut a week, I inflate like a balloon.