Before you try to make any changes to your habits, first you need to see where you are right now. Find out what your body mass index (BMI) is. See how it compares to a healthy weight. Start keeping a record of what you eat each day and how much exercise you get.
Eating is something that we do every day without really paying any attention. Once you start writing it down, you may learn things you never knew about your habits. You could be drinking five pops a day and have no idea. Taking stock of where you are now gives you a sense of what needs to change.