Tuna and Water Diet
Ready for a hardcore diet to get lean in a matter of days? This tuna fish diet is used by professional bodybuilders to prepare before the competition. It requires an iron willpower but guarantees 100% results.
3 Day Tuna Diet
Here is how it works:
- Normally this diet is followed for 3 days.
- Take in 6 equal tuna servings. Once each 2,5 – 3 hours.
- Drink as much water as possible. At least 3-4 liters. Water fills your stomach and? helps you not to feel hungry. There is no limit. Drink as much as you can.
- Take at least twice a day some vitamins. This is crucial since you won’t get much vitamins from tuna during this diet.
- You will need at least 1 to 1,5 grams of protein per pound of your weight (aroung 3 gram per kilogram).? Tuna’s marvelous as it contains 26 gram protein per 100 gram tuna. Here are two handy formulas to calculate your tuna serving size:For kilogram calculation: (bodyweight * 3 * 100) / (6 * 26) = bodyweight * 300? / 156 = 1 tuna serving (in gram)
For pound calculation: bodyweight * 100 / 156 or bodyweight * 150 / 156 = 1 tuna serving (in gram)
Don’t think it is an easy task, but the harder the task, the greater the payoff. For beginners I suggest to start the diet on friday evening after the work and keep it for two days. The reason is that you cannot control the regular food intake very well during a workday as you work normally 4 hours (or more) non stop and get only one break to eat. Moerover, two days tuna fish diet is not as hardcore as 3 or 4 days. I recommend this for all beginners. If you can keep this diet for two days without problems, wonderful, you can keep it for one or two days more.
Stay strong and be aware of forbidden foods. Your energy levels may fall in the first 1,5 days. You may feel very weak as never before. This is teh time of your spirit to stay as hard as iron and keep the diet! Your body will soon adapt and the strenght will come back.
Personally, I am doing this diet at the weekend every 2-3 weeks. It helps to burn the extra fat I may have gained during that period. It is a wonderful way to stay lean 365 days a year!
Update: Best read

Wow, I’ve got tons of emails and questions regarding this diet over the past two years. Here’s a tip to all of you who need some ideas to combine tuna with healthy veggies: get this book from amazon which is absolutely awesome: The Anti-Inflammation Diet. Apart of being a great read on what food has anti-inflammatory effect (which means less risk to get cancer) it has a few awesome recipes with tuna like the Granny’s Tuna Salad (my all-time favorite)!
Is it only for body building or any normal person can do it?
Hi ramya, thanks for the question. Well, I don’t think that bodybuilders are so different from anybody else. If you lead a healthy lifestyle, but have 1-2 “cheat days” a week, this 3 days diet once every 3 weeks may help to burn all fat you might have gained in this period of time.
Btw. it’s not healthy to stay on this diet for a long period of time.
iam young and have been on this diet and lost 10 pounds should i stay on this diet because it the only thing that works for me?
Hi tina, congratulations for your weight loss!
Cheers!
This diet doesn’t supply enough vitamins and minerals for a healthy diet. Moreover I wouldn’t recommend staying too long on a diet that completely excludes carbs, especially when you are young.
If you really think this is the only diet that works for you, try incluiding veggies and fruits. They will provide you with some complex carbs and vitamins your body needs. Don’t do pure tuna diet for more than 5 days. It is proven that you can eat as much veggies and fruits as you can. They make you feel “full” and so you can stay better in control of what you eat.
Try it and let me know how you’re doing.
I am a little overwieght and I wanted to know if I can try this diet. And for how long? Also I would like to know how much I would lose on this diet?
same question as what susan asked, how much weight will be lost if the diet is done and how long
Hi Susan, Tyrell. I can only tell you my own experience. I did this diet twice a month on a weekend (2-3 days in a row) to burn all the excess fat I might have gained in this period. I lost 1.5-2.5 pounds every weekend I did it. However, the weight you lose also depends on how much you exercise during this period as exercise makes you burn more fat.
). Do you know how wonderful a cold fruit salad on a hot summer day tastes? mmmmmmh! You’ll love it!
Susan, in your case I would try this diet for 2 days every 2nd weekend. If you feel comfortable, do some more days but not for a long time as I said in the comments above. Moreover I would suggest you taking at least HALF of your daily calories from pure fruits and veggies EVERYDAY! Make salads (but without toppings
I would also implement endurance exercises at least 3-5 times a week for 30-40 min.
I’ll be damned if this doesn’t help you to lose some pounds! Don’t hesitate to write me if you have any further questions! Good luck!
I tried a similar diet before reading this. I had oatmeal for breakfast, tuna in the mid-afternoon 2 hours before I worked out, and a bit of soup in the evening.
Doing that alone, while still dring lots of soft drinks, I still lost 14 pounds in 8 days.
Although I wouldn’t recommend eating 3 times a day and fill the rest of calorie needs with soft drinks, having smaller meal in the evening and complex carbs breakfast in the morning is also an excellent strategy.
Tuna is a good diet food and can be incorporated into your meal plan even without doing the pure tuna diet.
I have just started a diet, muesli for breakfast, tuna for lunch and chicken and veggies for dinner – it is day two – im going to vegas this weekend and i want to have fun at the pool… would you suggest the tuna diet to kick start my weight loss and then could i continue my previous diet. I have also been cycling 30min per day (i reallly need to lose weight!)
Rachel, of course you can! But don’t expect miracles. If you continue training for the next 4 days and do the tuna diet during this time you could lose 3-10 pounds. But it depends on your actual condition and many other factors.
Trying won’t hurt you. If there is something called the magic diet, it is definitely the tuna diet. If it doesn’t make you lose weight, no other (healthy) diet will.
One important thing: drink as much water during this time as you can! If you can do 3-4 liters a day, great! It is very important. It does wonders!
Extra tip:
(But NOT if you are planning to exercise during this period!!) It will make your skin look firmer as all water under the skin will be drained.
Then, if you really want to look slim and cut, stop drinking beverages/water last 14-16 hours before the pool.
It’s not healthy. Especially if it’s hot outside. So be VERY careful. You can start drinking again at the pool.
Hope that helped. Tell me later how it was.
Hey sparky – just wanted to update you – i am on day two and i hate tuna but i weighed myself today and i have lost 2lbs!!!!!!! so because of that i feel like i can just suck it up and keep going! it has also been hard fighting the temptations but youre right it makes me feel so good just being strong!
thank you soo much – i will keep on trucking and follow your advice and get back to you when i finish my 4 days!!
cheers!
Hey Rachel! Thanks for your feedback. Excellent news! I cant wait hearing from you soon after!
Can you eat lite mayo on this diet
hmm, I am not sure about this, Latrice. The idea is to eat lean, but if you find tuna absolutely horrible try adding Mustard (“de Dijon” is the best), not mayo. And eat it with a slice of whole grain black bread. It tastes good.
Hey Sparky!
its me again sorry i took so long to write back, but yes it did work i lost about 7lbs in 4 days, i didnt eat too badly in vegas and ended up with a 4lb loss. since then i have had birthdays and a wedding but now i have time to focus on me – it is seriously the first time i have lost weight since i came to the states, how can i continue to follow this day to day? and continue my weight loss?
Hi Rachel!
I am so happy you wrote! Yeah, I know how hard it can be , especially when there’s so many trash food around. My friends and my parent do not eat healthy. And each time I visit them, well, I end up eating some junk.
And, you know, it’s hard to say my mom “no” if she has cooked something special just for me.
But it’s not that bad. As long as you keep yourself under control (more or less) and eat healthy when you’re back home, it’s all right.
For myself, I have found that
[jogging in the evening half an hour 4 days a week]
makes me lose weight even if I have 2-4 “special events” during that week.
The trick is not to eat anything 1,5 before and 1 hour after the jogging session. Then you eat something like an apple and a low-fat yoghurt and go to bed. The after-burn effect lasts practically the whole night.
Each time I re-start my jogging sessions, I usually feel and see the results after 4-5 days.
So, keep your eating habits healthy, don’t get depressed if you eat junk food sometimes during the week (The road to success is not a straight line) and do some endurance sports in the evening.
Hope it helped, Rachel
what do you think about body for life?
I just started the diet today. So far I’ve only eaten two cans of tuna and 5 slices of wheat bread. I wasn’t planning on eating the bread, but I was so hungry I couldnt help it…does the fact that I ate bread matter? I’ll try not to next time. How many cans of tuna should I eat a day and how come the tuna diet can’t be for more than 5 days? I’d really appreciate it if you can help me..I need answers…
hey dorothy – i did this diet and lost weight but what you have to do is avoid all carbs so that your body has to use your fat for fuel instead of carbs… so no bread, pasta, fruit etc… it will only work if you avoid carbs – when i found the tuna to be too much i ate grilled chicken instead so try that – this diet really sux but if you do it for just one day you will see results the next morning! so start again and stay away from carbs!
Amen, Rachel. =) You’re right. I couldn’t say it better than you have.
Dorothy, the reason why you shouldn’t do this diet for a long time non-stop is that you don’t get enough vitamins, minerals and fiber during this time. It is also not advisable to be long time on an non-carbs diet (the atkins diet).
While it is true that you can lose a lot of weight on a carb-free diet, it will have negative side-effects on your health. Do not lose weight on cost of your health! It’s like so many female friends I have who started smoking just to lose few pounds. But at the end you never win with this strategy!
Do this diet few days a week. 2-3 times a month if you want to. But don’t overdo it. Consistence and patience is the only thing you need to succeed. As Kafka said:
“There are two principal human sins from which all others can be derived: impatience and laziness. Because of impatience they were driven out of Paradise, because of laziness they do not return. Or perhaps there is only one principal sin: impatience. Because of impatience they were driven out, because of impatience they do not return.”
Think about it!
Thank you both( Rachel and Sparky ) for the advice. I really appreciate it, it’s nice to know that I can get help by coming here. I’m 16 and I’m really trying to lose weight. I’ve lost weight before, but sadly gained it all back and more. I’ve heard about this diet through a friend…and I decided to try it even though I know it’s gonna be really hard. I’m SO hungry it’s not even funny. I have the urge to eat other things. I’d like to know, how important excerise is with this diet? I feel so weak that I dont even want to think about it. Im SOOO hungry, but I’m going to try this diet out for 1 or 2 more days…after that would it be okay if I ate more? What if I gain everything back? Thanks a lot for your help and I’ll keep yall posted…thanks again
Thank you both( Rachel and Sparky ) for the advice. I really appreciate it, it’s nice to know that I can get help by coming here. I’m 16 and I’m really trying to lose weight. I’ve lost weight before, but sadly gained it all back and more. I’ve heard about this diet through a friend…and I decided to try it even though I know it’s gonna be really hard. I’m SO hungry it’s not even funny. I have the urge to eat other things. I’d like to know, how important excerise is with this diet? I feel so weak that I dont even want to think about it. Im SOOO hungry, but I’m going to try this diet out for 1 or 2 more days…after that would it be okay if I ate more? What if I gain everything back? Thanks a lot for your help and I’ll keep yall posted…thanks again
P.S. I’ve had problems with laxatives in the past, but have stopped taking them. I was taking them like it was water..even though i hated taking them it did help me lose weight. Sometimes I’m tempted to start taking them again..what if I was to eat some breadsticks or something and then continue this diet tommorrow? You don’t know how hungry I am!!
Dorothy,
the most important thing during ANY kind of diet is never, _never_ to feel hungry, if you want to keep the weight off for a long time.
Your body is highly adaptive and if it notices that you don’t get enough food, it will save “a chunk” as a reserve next time you eat normally again. In other words’ you will regain weight.
So in your case, try to eat more so you keep your body constantly somewhere between being full and hungry. Balance is the key. You won’t overeat. Do more sports, if necessary. But NEVER let yourself feel hungry. I can’t stress that enough.
What I found for me quite effective when I’m hungry is eating fruits like green apples: You get extra shot of vitamins, fiber, feel more full and can eat as much of green apples as you wish because they don’t count
I am not a big fan of unnatural ways to lose weight as they always tend to have negative consequences on your health or do not give long-lasting results. So guess what I think about laxatives. =)
Laxatives cancel out all the benefits of fiber. Do it for a longer period of time and you can kiss your digestive system good-bye.
Don’t.
I was thinking about soing this diet but, do you smell like fish? I know it sounds weird but, It’s a real question.
Also can you eat more tuna and still lose weight? I weight 143lbs and was wondering how many cans of tuna I should eat a day? I would like to be 130 asap so Can I saty on the diet for a week or 2 p.s I do like tuna
Just wondering will if it hurt me if I’m still hungry can I just eat more tuna?
Susan, as I already said several times before, don’t do tuna-only diet for a long time. Add fruits and veggies and maybe whole wheat bread if you want to stay on this diet for more than 5 days.
There are different kinds of tuna on the market. For example, I LOVE tuna that I buy at Lidl(a small store where i live), but I also tried tuna from other company that tasted absolutely awful!
Try different offers and see what tastes better for you. Add spices. For example tuna with mustard tastes much better. But only if you like mustard. >) Find out what works best for you.
And no, you don’t smell like fish. I can prove that
… Well… unless you don’t brush your teeth once in a while
Clint, of course you can eat more! The trick is to find a balance where you don’t feel neither hungry or full. Your body will be more ready burning the fat if its not in “survival mode”.
Because if it notices that you don’t get enough food in. It will fight for every drop of fat. It will be harder to get rid of it and once you’re back to normal diet, you will regain that weight very fast. Balance is the key.
Hope that helped folks
can you have any cofee or hot tea while on this diet it’s only my forst day but, no hot beverages seems the hardest part
Hi Susan,
I drink tea several times a day. If you don’t use suggar, it’s like water. The same goes for coffee. In fact (green/black) tea and coffee speed up your metabolism, which makes it faster to lose your weight.
Thanks,
Day two and no problems so far.
Hey guys the tuna diet does wonders, I followed it once for more than a month and used to lose a pound every other day if not everyday. I’m trying to go on that diet again but can’t seem to stick to it, though I need it badly now.
(Sparky I don’t care about healthy I just want those pounds to fall off!)
Anyway I am starting tommorow and I am going to be working out for an hour. I will also add skimmed yogurt to my diet because i heard it aids in maintaining lean muscle and speeds up fat loss especially abdominal area. (Where all the fat in my body is stored!)
Good luck dieters and i’ll pop in every other day and tell you how I am doing.
Hi Everybody! I’m so glad that Everybody is talking wonders about the Tuna Diet. I would like some advice though I want to start this diet but before I do it I want to know if that diet target all body fat? My problem is just my love handles I need to get rid off them!! I’m skinny but I have a horrible belly !! I do exercise and drink a lot of water but it doesn’t go away , and I watch my diet too ! Help me with this one .. thanks and good luck to everybody
Hey what about eating tuna and taking like Centrum vitamin pills?
You get your iron, vitamins, minerals…. your good to go
I used to use cup of noodles like 40 cent kind, water, and centrum
hey, i was jsut woundering after about 5 days of this diet and i start adding like fruit and veggies and stuff…how long should i do that for?and once i loose the wait how can i keep it off?like whats a healthy way of me eating…ive never dieted before or even tried jsut eating healthy…so what can i do t keep that wait off after i lose it and what excursises should i do? ab and running?
thanks
If you are on the tuna diet long enough, does it affect the way you smell “down there”? Honestly. I know that your diet does affect the smell and taste, but is it fishy?
I did this diet and I drank alot of water…. i found that if you drink about 3litres of water a day “down there” does not smell anymore! no matter what you eat.. drink alot of water and it has no smell at all!
Hey when people say they lose 2-3 lbs. is that fat or including water?
and by looks how much is 1 lbs. of fat , I have always been curious of that.
Hi guys, sorry for not posting soo long. I have been quite busy lately.
Anyway. Mike, 3lbs are +/- 1 kg. You also lose excess water in the first week by drinking 3+ liter/day. Afterwards, if you dont starve yourself (a common error which leads to failure) you will be losing plain fat.
Again, I advise you to add LOTS OF fruits and veggies if you are planning to go for more than 5 days. It will keep your hunger in check and give all the vitamins and minerals you need.
Cheers and good luck!!!
Hey, I was wondering can we add vegetables to the tuna or will it change the diet? I used to LOVE tuna but only after 2 days on the diet that love quickly went away. It started to smell really fishy I had never noticed it to smell that much. Is it just part of the diet? I’m trying to add the vegetables to it and a little mustard like stated above.
hi Im 24 years old and i am very over weight. I want to know if i do this diet for 5 days, 2 times a month. what things would you say to eat when your not doing the tuna thing?
hi! Im 21 and I have eaten a lot so i’ve gained a lot in few days and im very sad… I will try this diet for rapid weight loss. Do I have to eat so much tuna??? each serving must be about 100 g and that’s a lot! I don’t like tuna… I hate it but I know it’s great for weight loss. Can I eat 2 cans a day? I am 120 pounds
your gonna die if you eat 2 cans a day, eat way more than that, it didnt work as good as i thought it would, next time ill exercise alot more, defintly a little harder than it looks
WHAT DOES THIS MEAN “Take in 6 equal tuna servings. Once each 2,5 – 3 hours” ? Is is 2 oz every 3-5 hours???
I weigh 140 pounds. How much tuna do I consume? Just trying to keep it simple.
kim: with your weight you should take between 140 and 210 grams of tuna per day. That’s 25-35 grams per one serving each 2,5-3 hours.
As 1oz is more or less 28gram you can keep it simple and just take 1oz per serving.
Hope that helped!
This means Kim will need to eat 1oz of tuna everyn 2.5hrs. It will take her all day to just eat one 6oz can of tuna. seems crazy???!!!
Well then
welcome to the crazy club of tuna dieters! hehehe
It’s not that crazy… believe me
I just started the tuna and water diet,I love tuna and I buy it fresh(not canned),marinate it with ginger,garlic,red chillis,mixed herbs,lemon juice, spices and grill it.Its delicous.I hope the spices are not counted as extra carbs.
I will be posting my weight loss here after I finish 4 days on this diet.
Thanks for the comment jaishree! I’m looking forward to your next post with results!