in hyperthyroidism (or when we take too much levo)

[Joannagof1]

what causes us to lose weight?is it because hyper cause tachycardia (which leads to burn more calories )or something else?

[greygoose]

Taking too much levo can actually make you put on weight! Been there, done that. lol Even people with Grave's can put on weight. And hypos can lose weight, too.

Anyway, I don't think it has much to do with calories. more to do with metabolism. And, that's assuming it is actually fat that makes the weight pile on. It could be mucin/water, which has absolutely noting to do with calories or exercise. But, I don't think anyone know that much about it.