The AHA diet

Another variation on the military diet, which has nothing to do with the American Hospital Association.  Also known as the Mayo Clinic diet (which has nothing to do with the Mayo Clinic).

The Three-day AHA diet consists of highly specific instructions for breakfast, lunch and dinner menus. Few substitutions are allowed. 
On the first day of the diet, you are instructed to eat half of a grapefruit for breakfast accompanied by a slice of toast spread with peanut butter, another slice of toast with 1/2 cup tuna fish for lunch and 3 ounces of lean beef, chicken, fish or pork paired with green beans, carrots, an apple and 1 cup of vanilla ice cream. 
Breakfast on Day 2 consists of an egg, toast and a banana, while lunch is five saltine crackers with 1 cup of cottage cheese or tuna fish. Dinner is two hot dogs along with carrots, broccoli or cabbage, a banana and ice cream. 
On the final day of the diet, you'll eat saltine crackers with cheddar cheese and an apple for breakfast, a hard-boiled egg and toast for lunch and 1 cup each of tuna fish, cauliflower, carrots and melon for dinner along with more vanilla ice cream.

The Three-day AHA instructions direct you to drink water, diet soda, unsweetened tea and black coffee daily but strictly specify that you are not allowed to use seasonings other than salt, pepper, lemon juice and mustard or eat any snacks in between meals. Proponents of the diet claim that changing any of the menu foods or amounts will prevent you from losing the optimal amount of weight. They contend that the diet works because the specific food combinations stimulate an increase in your rate of metabolism. Followers of the diet are encouraged to eat normally for four days after completing the plan's three days, after which they can resume the diet again.
http://www.livestrong.com/article/520049-the-unofficial-mayo-clinic-grapefruit-diet-plan/