Being overweight, eating poorly, and being physically inactive all increase your risk for high blood pressure, heart disease, stroke, diabetes, and some forms of cancer. Other factors affecting your disease risk include your family and medical history, and lifestyle factors such as whether you smoke or drink too much alcohol.
You need to start calculating how much calories your taking in, so keep a diary of what you eat over a week. Write down the amount of calories your eating at the end of the 7 day week and look at what types of foods you are consuming. If you have too many junk foods in there then its time to cut it out and get eating some whole foods full of healthy nutrition.