Losing is easy! Maintaining? That's another ball game.
It took me from the age of 16 to 52 to figure out maintaining.
I feel for you and your friends, it's tough to see them work so hard to lose, and then, gain it back and more. I have been those people!
All I can say is one afternoon in the garden, while having a pity party, I realized, that it was all up to me, to make the good choices or NOT.
Since then, I make more good choices than bad. It's a tough road, but I decided that I needed to put me first. I'm no good to anyone else, if I'm not healthy and happy.
3+ year maintainer.
The human body is capable of amazing things! But without the mind, it is nothing. Get your mind in gear and the body will follow!
Be selfish about caring for yourself, you deserve it!