Yep, and then they slide right back into their old habits and put it alllll back on (if not more).  Years ago I was in a D&D group and the DM was massively fat. About a year ago he lost a bunch of weight and actually looked like a human being again. Everyone congratulated him. He hasn't posted a new picture on Facebook since then. But there are some recent ones that he's been tagged in. Ballooned right back up to his old weight.