A diet consisting of only tuna and water will cause more health problems than they will fix. You will probably lose weight, assuming your metabolism doesn't crash, but you will lose both fat and muscle. You will not feel good, you will quickly accumulate nutritional deficiencies that will impair your health, and you will not be able to sustain this diet as a lifestyle and therefore the weight will come back. If you want to achieve long-term success, the concept of this diet can be used but it needs to be heavily tweaked.
Protein
Tuna is a great source of protein. It's incredibly lean and the fat it does contain is healthy omega-3 fat. The problem with tuna comes about from the amount of pollution that exists in the water. Tuna unfortunately contains levels of mercury that can be harmful to your health if tuna is the only thing you eat. What you should do is get a variety of lean meat protein sources such as other types of fish, lean cuts of beef, turkey, and chicken. There are many ways to prepare these types of protein sources and heavy use of rubs, herbs, and spices can provide a lot of calorie-free variety.
Carbohydrates
Your body needs some carbohydrates to function effectively. Brain function is improved and energy levels are typically higher. The key to eating carbs is timing and type. You should eat the majority of your carbs for breakfast, lunch, and right after you work out. Try to avoid heavy carb intake in the evenings or right before you go to bed. If you workout in the evenings, don't worry about consuming a bunch of carbs right after. Your body needs the energy to repair itself and it will easily make use of the carbs you eat. The other issue with carbs is the type. If you are sensitive to carbs, you want to stick with low-glycemic carbs such as oatmeal, yams, and brown rice. The less processed it is, the better. These types of carbs usually have higher levels of fiber and are digested more slowly. This keeps your insulin levels from spiking and gives you a feeling of satiety for a longer period of time.
Vegetables
Green vegetables are your freebie. You can eat as much vegetables as you want. Don't soak them in dressing, cheese, or any other calorie-laden addition. You can eat them raw, steamed, boiled, seared, grilled, or however you want. It is next to impossible to eat too many vegetables. Vegetables will also go a long way to improving your health because of all the nutrients and fiber each vegetable provides. You should eat vegetables with every meal and as snacks throughout the day.
Water
Water should be your go-to drink not only for your diet, but also as part of your lifestyle. Water has no calories and is necessary for the healthy function of your body. Do not drink sodas, diet or otherwise, juice, alcohol, or anything that contains sugar. Non-water drinks can add a surprising amount of calories to your daily intake and can easily sabotage your efforts. Tea is a great alternative if you can't drink just water. Use a sweetener if you must but do not use sugar. Eventually you can add back a limited amount of your favorite drinks but keep in mind the amount of empty calories you are consuming.
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