How to Lose Weight on a Tuna Diet


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.

Man eating tuna salad
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Step 1

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.

Sliced grapefruit
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Step 2

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.

Woman eating in kitchen
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Step 3

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.

family cooking in kitchen
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Step 4

Repeat for two more days.

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Tips & Warnings

  • A meal plan of this type will average a little under 1,000 calories per day, and has very few carbs. It cannot be sustained on a healthy footing, especially by someone engaging in an active lifestyle. Consider it a fasting plan to hit a short-term weight target, but no more.


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