Diet and exercise is one thing which needs a strong will to follow on a regular basis.Anyways a diet low in carbohydrate
like the one rich in fibre especially salads, fruits, oats etc help in a good way to fill the bulk and reducing hunger. But diet should be balanced containing atleast 50% CHO, 25% fat and 25% protein which is essentially required. Just see to it that your diet should atleast be 1800 to 2000 cal/per day or else you may start feeling weak. For exercise you can start with brisk walking and move to jogging, cycling because if you start jogging at this stage you may sustain injuries, weight training
may also help to bring tonning to the body.Hope this helps you.Take care and regards.