Discover why you are overweight and work on disempowering the reason. I suspect that in the majority of cases a weight problem is the side affect of head issues such like low self esteem or self worth, psychological trauma etc. If you comfort eat use your inner voice to challenge, balance and eventually disable the negative messages you give yourself.
Being overweight is a psychological problem more than a physical one, at least it is for me. Whatever the reason you may want to consider counselling. I did and it really helped me.