The Gabriel method basically works on the premise that your body doesn't get what it needs from junk foods, and thus makes you eat more and more until the proper nutrients are given.
Jon Gabriel teaches you how to incorporate what your body needs into your diet so that your body stops trying to eat everything. He compares it to feeding a baby pepsi when it really wants breast milk. No matter what, it'll keep drinking pepsi due to ignorance until it gets the nutrients that breast milk provides.
As I said before, this concept is covered in my blog and in many weight loss programs. Nothing new