If you don't have diabetes, it would be off label use in that case, which is not illegal.
How did you get your prescription?
In the UK you just fill in an online form. I don't think anyone is going to come and weigh you to double check what you put in the form is true. Almost zero oversight which is a bit shocking really.
that's fascinating to me as I've not heard any similar feedback and it seemed counter-intuitive
may I ask for how long now? are you athletic? have you experienced any muscle loss?