19 yrs ago my sister weighed over 1800 lbs. It took 17 years but she got down to 145 lbs. She had 4 surgerys to lose the lose skin and is now a model. She has gone back to her old eating habits and I want to help her stop, but she always pushes me away. How can I help her not to be the way she was?

she lost the weight w/o any surgery at all