We think that beliefs are a result of our experiences, in fact it is the opposite. Experiences are a result of our beliefs. Beliefs run our lives. If you just inquire into your beliefs and alter the beliefs that might not be serving you, then you will have the body and life you want.
Here is a marvelous Ted Talk by Kelly McGonical about beliefs related to the nature of stress in our lives and how simply changing those beliefs can not only change your life but perhaps can save your life. Click this link to see and hear. Ted Talk rethinking our beliefs about stress