I've been thinking about this the last few days. is it appropriate to comment on someone's weight loss if you know they have been working on it? Or is it better to just not say anything?

I have mixed opinions on this.

Personally I'm currently trying to lose weight and would welcome positive feedback showing that my hard work is paying off...But at the same time if I received too much positive feedback I might start to feel like I wasn't as worthy of a person before I lost weight. I actually lost a good amount of weight several years ago and got a lot of compliments... Which I think contributed to maybe some disordered eating later in life.

My partner is also working on losing weight... I'm not exactly sure but if I had to guess he's probably lost 15 or so pounds. She has quite a bit more to lose But I do think I am seeing some small differences (his pants look a little baggier, belly looks a little smaller). I'm not sure about best practices for commenting on a partner's weight loss. On the one hand I see him everyday so the changes would probably not be as noticeable to me as they might be to people who see him less frequently... But at the same time I'm also more likely to see him without clothes so I might see things sooner than others (who see him fully clothed). Same as above I don't want him to think that I love him anymore because he's losing weight. But I also want to encourage him and let him know how great he's doing.