Trust in God in all matters, especially your health and habits, and you will see that you needn't worry about anything.
Real, unsolvable problems only occur when you are not allied with God in all aspects of your life.
Give God your weight problems. Go ahead, don't be afraid. Rely on God 100%, and be partners in this life, together.
Putting your faith into action brings results – but you will never know it until you try it.