appetite suppressant

I have a friend who was diagnosed with hyperthyroidism a few months ago. Ever since I could remember she has always been so conscious of her body weight and figure. And ever since I could remember she always would love to eat anything. Since her appetite for food is quite good she is finding it hard to lose weight. Sometimes she takes appetite suppressant. But ever since she had hyperthyroidism she doesn’t need appetite suppressant anymore because even though she eats a lot she just doesn’t get fat. I guess it is because of the toxic in her body.