The tuna diet is a variation of the high-protein, low-carb diet that is a time-tested road to quickly reducing fat. It is popular with body builders seeking to "get ripped" (quickly cut fat), or anyone else who needs to reach a weight target quickly. The rules are simple and the diet is easy to follow, and will yield good results over a three-day time frame. However, it should be remembered that it is a diet for quick results, and not a sustained weight-loss plan.
Eat a half grapefruit (or the equivalent in juice) and a slice of toast for breakfast. The toast can be with or without peanut butter. Drink water, coffee or tea, but without milk or real sugar. Artificial sweeteners are OK.
Eat another slice of bread or toast for lunch, but this time include 1/2 cup of tuna. Once again, drink water, coffee or tea with no milk or real sugar.
Build your dinner menu around 3 oz. of any lean meat; tuna is a good choice again. For veggies, you can have 1 cup of green beans and 1 cup of carrots. Your desert takes the form of 1 cup of vanilla ice cream, plus 1 medium apple. Your drink options are limited to water, tea and coffee as usual. Be sure to consume this meal at least four hours before you go to bed.
Repeat for two more days.