First: you can improve your health and physical appearance which will increase your confidence and security.
Second: you will avoid suffering from diseases such as diabetes, obesity among others.
Third: retard aging.
How to do it?
The first thing you should do is look for a motivation.
You must be determined, the change is hard but very positive.
change your diet so you will get results faster.
always look for a professional to help you.
come on and good luck!