Do you think I should tell my girlfriend not to eat sugar?
I don't know, why don't you want her eating sugar?
She has diabetes and already has had one leg cut off.
It is good to care about your girlfriend's health. She shouldn't eat too much sugar especially if she has diabetes and could get sicker.
There is no cure for diabetes and it makes me sad.
Yes, it is. Hopefully you can get her to cut down on the sugar and improve her health.