Remember that this is for life. Givign up is like say I don't care what my physical health might end up like.
Carrying on shows you care for yourself a lot and in the long-term it will make a difference, both inside and out.
Dont' ever forget the positive effects on blood, Bone, Cholesterol, Brain etc, that you can't see. It's not all about visual change, so hang in there and keep reminding yourself that you ARE worth it and you DO matter