Well not everybody loose weight the same way. So for some people, especially if their original weight was very high, it might not always be perceivable by other people till a certain loss is reached. Might be the case ! Anyway good job on you ! It's a difficult thing you achieved !

They poetically just didn't say anything because they're friends with you for you, not because of your body

if you went from clinically obese to a "healthy weight" by losing 50 pounds and no one noticed then you are probably not a healthy weight yet.

i bet u look stunning!

Damn people are cold At least you tried OP Dont get discouraged

Maybe they like you no matter what you look like

Just because no-one said anything doesn't mean they didn't notice. Besides, if it's been a while, their memory of you probably wasn't that fresh.

I'm sure they noticed but didn't want to be rude. The etiquette around this is tricky these days. You don't want to imply that somebody used to be fat, and you don't want to praise being thinner too much because it might make you feel that your worth is based on your weight.

Congrats on the weight loss ! You did it for you, and as long as you feel good that's all that matters !

In a way that can be a good thing. It could mean that they never cared about you being overweight and instead cared more about being your friend.