My SO is trying to lose weight, and they've had to make fundamental changes in their daily habits to break the bad behaviors. This was quite hard, especially since they have friends on the other side of the world and would stay up late chatting/gaming with them, which resulted in late night snacking and overeating.

I am naturally quite thin, so it's hard for me to appreciate the work they put in to lose weight. But they've already lost ~10 lbs by changing routine over the last month or two, so I'm trying my best to encourage them to continue, especially with the holiday season coming up (we exchange treats with neighbors). We set a goal together, where once they hit their target weight (in the normal range), they'll get a significant reward (in this case, it's minor cosmetic surgery for something that has been bothering them).