When you get sick you go to the doctor.
Your doctor may prescribe some type of medicine, and in the case of minor illness or infection, that prescription may get you healthy again.
If you become overweight or obese, you can eat certain things and avoid others, and if you keep up your healthy eating regimen long enough and include regular exercise, you can burn off all the unhealthy, excess body fat which has been linked to a multitude of health problems.