Principle No. 3. Moderation

The healthy way is to be moderate. The key is balance; not over-eating, not starving yourself either; not being a couch-potato, not exhausting yourself with 24-7 gym sessions either. You don't have to lift 200-lbs barbell to loss weight.
Not carbohydrate is bad, too much carbohydrate make it bad; not fat is bad, too much fat makes it a bad thing. The key is moderation. Not too much, not too less, the key again is balance!
Listen to your body, work with your body. The key is to tip the balance to lossing. Let your body works by itself to loss.