Oriental Medicine Diet

My mom kept saying she needs to go get herbal medicine for her diet.

I heard that taking herbal medicine can actually cause weight gain. Is it because it makes you healthier? I think they said it would make you gain weight.

Actually, what do you think? Is it good to lose weight with herbal medicine, or is there a higher risk of gaining weight instead?

Does eating traditional herbal medicine really make you healthier, leading to eating more and gaining weight?

How far does traditional medicine, including herbal medicine, extend? It seems to cover a broader area, but I'm not quite sure.