You have to do this the right way, with a healthy diet and excersice, I personally 're omens that you go to a physician first to evaluate your condition and guide you to which physical activity can suit you. But you can stay by walking, 30 minutes a day, at a speed that elevated your heart rate, but not too much, because you are starting. With the food try to make some changes, like no soda o junk food, eating more veggies and lean meat, and try to control your portion sizes, don't start your self but don't binge eat, as well drink plenty of water sometimes thrist is confused with hunger.