I'm always the one who's doing the regaining, unfortunately. I have this tendency to fall off the wagon for various reasons (pregnancy, injury, just plain losing motivation) and undoing all the hard work I put into losing weight. Being on that end of the stick, I'll tell you that for me, when I've fallen off the wagon and see people still going, I feel jealous that they are continuing to succeed while I failed. It makes me feel bad about myself, but it's my own issues and problems, and I'm genuinely happy for them that they are still going.
Although I do have a friend who I've watched regain a couple of times as well. Right now I'm very motivated and have been working really hard to stay motivated and she's on a regain. I feel awful for her since I've been there, but there's not much I can do but focus on my own journey.
I guess all you can do is be there for them, offer support and encouragement and hope that maybe you can help inspire them to get back on track.
for every 5lbs lost
Halfway to goal (207)
No longer obese (191)