I found this article on the car card advertising of Shukan Gendai. Then I went to the super market on my way home and bought two cabbages.
Dr. Yanase of Nagoya Univ created this cabbage diet and he actually has lost over 30 kg. It is very easy. Eat 1/6th of a cabbage by size before your regular meal. The basic rule is to cut them into 5cm squares and eat these squares raw with light dressing like lemon juice and pepper. When you eat it, chew as many times as you can. If possible, you should eat it before every meal, but otherwise, before dinner alone is fine. When you are tired of raw cabbage, you may try it boiled, pickled, or cooked with pepper, but raw cabbage is always the best.