After several attempts on the 3-day diet, which has been claimed to be so effective to most people but has zero effect on me, I have decided to try the 1-day diet.   Diet menu   Breakfast   1 Egg, hard/soft  1/2 grapefruit  1 cup black coffee( no sugar, cream except for artificial sweetener)   Mid-morning snack   2 Ritz biscuit, each with 1/4 slice of American cheese  1 cup black coffee( no sugar, cream except for artificial sweetener)   Lunch   1 can of Tuna  3 half stalks of celery ( no salt)   1 cup black coffee( no sugar, cream except for artificial sweetener)     Dinner     3 oz of skinless chicken/fish   6 broccoli/cauliflower florettes   1 cup black coffee( no sugar, cream except for artificial sweetener)     And that's all.   What's diffferent from the previous 3-day diet that I tried is that the menu is really very simple. So it is rather easy for me to do shopping.    By the way, seasoning like mustard, ketchup, vinegar are allowed but I am not adding in any of these ...