Like many of the things we've talked about so far, such as assertiveness and problem solving, eating healthily and exercising are just habits. If you need help and information with diet, nutrition and exercise, have a look at "The Little Online Book of Weight Loss" on this site.
In order to develop habits you have to start now by making a commitment to develop healthier habits. You'll also need to work out what type of healthy diet and exercise suit you. It's important to enjoy your new healthy habits, otherwise they will be difficult to keep up. So if you don't like running, don't do it - but find something else that you will enjoy.
Stress is a medical condition and it can have a serious effect on your health. If you think you are suffering from stress it is crucial that you consult a medical professional.