Yes.. you've known this for 8 months: https://news.ycombinator.com/item?id=43988512

If fat cells (adipose) rarely go away but store less fat, a person may likely always have the capacity to regain the weight.

Hm. Run this analysis for diabetes drugs and insulin.

It's interesting how moralistic the media becomes when fat people lose weight without "earning it" by their lights. Almost like it's some kind of bias.