Three Day Tuna Diet The Pros and Cons

Tuna Diet The Pros and Cons

What Is The Tuna Diet?

This Three Day Tuna Diet has been around since about 1985. It is also called the 3 Day 10 lb. Diet, and The 3 Day Weight Loss diet. The Three Day Tuna Diet has been associated with the Cleveland Clinic, Mayo Clinic, and American Heart Association. Not one of these organizations in reality had anything to do with developing the diet. This diet claims to lower cholesterol, improve energy and cleanse the body. It fails to recommend exercise as part of the three day program.

The diet is acceptable for a person that is in good health and wants to lose weight quickly for the summer or because they are attending a special event. The 3 Day Tuna Diet is designed to be a diet for quick weight loss in a very short period of time.

Pros and Cons of the Tuna Diet


  • Raid weight loss primarily water weight
  • Diet high in protein
  • Geared to short term results
  • Only three days


  • Very restrictive not a good selection of food from all the food groups
  • Leaves you feeling hungry and weak
  • Results are short tern unless you stay on a healthy diet
  • Most dieters will not lose 10 pounds


3 Day Tuna Diet Meal Plan

The three day tuna diet plan is easy to follow and shop for food.  It is recommended by those that have tried the diet not to use any substitutions. Below is the three day tuna diet meal plan. There are no snacks allowed. Canned tuna should be packed in water not oil. Bake or broil meats and poultry and raw or cooked vegetables are acceptable. Listed below are the substitutions allowed for the diet.

Day 1


Black coffee or tea with sugar substitute

4 ozs. or ½ cup fruit juice or half a grapefruit

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1 slice of toast with ½ teaspoon to 1 tablespoon of low fat peanut butter as spread


1 slice plain toast

½  cup tuna packed in water

Water, diet soda, black tea or coffee sugar substitute allowed


2-3 oz. of cooked lean meat, chicken or fish

1 cup cooked green beans

1 cup grated carrot

1 medium apple

Water or black coffee or tea with sugar substitute

Day 2


Black tea or coffee with sugar substitute

1 egg hard boiled, omelet, or poached

1 slice plain toast

1 banana


1 cup of tuna packed in water or cottage cheese

5 saltine crackers

Water, diet soda, black tea or coffee with a sugar substitute


2 hot dogs or beef franks

1 cup of raw or cooked cabbage or broccoli

½ cup of cooked or raw sliced carrot

½ cup of sugar free ice cream

Water, black coffee, or tea with a sugar substitute

Day 3


Water, black coffee, or tea with a sugar substitute

5 saltine crackers

1 ounce cheddar cheese

1 apple


1 hardboiled egg with 1 slice plain toast

Water, diet soda, or black tea or coffee with sugar substitute


1 cup tuna fish packed in water

1 cup of cooked or raw cauliflower

1 cup carrots

1 cup melon

1 2 cup of sugar free vanilla ice cream

Water or black coffee or tea with sugar substitute.

Diet Substitution Information

What the substitutions for the 3 Day Tuna Diet?  They are very limited and are listed below.

Diet Food           Substitutions

Tuna                    Cottage Cheese

Grapefruit           Orange

Broccoli               Cauliflower

Ice Cream            Yogurt

Carrot                   Beetroot

Meat/Egg             Tofu

Crackers                Toast

What Does an Actual User of a 3 Day Tuna Dieter Say?

Below are two videos that discuss the positive results of the 3 Day Tuna Diet. Many healthy men and women have the patience and resolve to succeed at this diet. This diet works for some people not everyone.

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The 3 Day Diet Does Really Work YouTube by MiaBellaBeauty

Dangers of the Three Day Tuna Diet

Eating too much tuna can raise mercury levels in the body. It is not a healthy substance. Albacore tuna sometimes has high mercury levels. Mercury  is known to cause health problems. This diet does not have a backup plan for dieters after they finish the three day diet. The Three Day Tuna Diet leaves the dieter in limbo without a course of action. Weight loss from the diet is primarily water weight and muscle not stored fat. Often within a short time the weight will return.

Those that try the 3 day Tuna Diet should be healthy. Anyone suffering from a chronic disease should not try it. An individual with diabetes, kidney disease, a heart condition or other chronic illness should check with the doctor or avoid this crash diet. It is designed for healthy adults

The 3 Day Diet is not well balanced. It does not include foods from all groups in the Food Pyramid. All groups should be included in a healthy diet. The 3 Day Tuna Diet has less than 1,000 calories. It leads some users to feel constantly hungry, tired, and lacking energy.

Get Best Results Five Tips For The 3 Day Tuna Diet

  • Drink a glass of water first thing in the morning and a glass with every meal. This will give you a feeling of being feeling full and flush out toxins in your system. Strive to drink at least 3 to 4 glasses of water daily.
  • Eat slowly this will make you feel full. You feel more satisfied and less hungry. If you don’t eat everything in one meal save it for the next and eat it later.
  • Do at least ½ hour of moderate exercise daily. Try walking, running, biking, housework or even yard work. Move and don’t get too lethargic with this easy 3 days diet.
  • Eat five hours before going to bed. This gives your body time to digest and helps you get a good night’s sleep. Sleep is important to good health.
  • Plan to start another healthy diet after you finish with the 3 Day Tuna Fish Diet. Four diets backed by science evidence are the Low Carb Real Food Diet, Mediterranean Diet, Paleo, and Gluten Free Diets. Look into these diets after you finish the Three Day Tuna Diet. Don’t forget to have an exercise program too.
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Do You Recommend The 3-Day Tuna Diet?

The 3-day Tuna Diet is a low calorie diet that only healthy individuals should try. It works when you follow it strictly and don’t cheat. The benefits are it is easy and involves very little cooking or preparation. The diet is inexpensive and you do not have to buy special ingredients. It is a good option for those that need to lose a few pounds for a wedding, special outing, or vacation.

WebMD does not recommend this diet due to the fact that it is not nutritionally sound. There are too many restrictions and it lacks in basic nutrition. Because it is only three days it is acceptable for healthy individuals that are aware of its limitations. There are several videos on YouTube of individuals who have followed the diet. Overall we would recommend it to those that don’t have major health issues.

The Verdict

The Three Day Tuna Diet is acceptable for healthy men and women that want to lose a few pounds quickly. They must have another diet plan in place to replace the three day diet when finished. Mild exercise should be part of the three day plan too. It should be avoided by anyone with serious health problems.

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