Banana Diet

 By Mizpah Matus B.Hlth.Sc(Hons)

The banana diet involves a number of eating plans that use bananas as the primary food basis of the diet.

When the Morning Banana Diet was promoted on the Japanese social networking site ‘Mixi’ in March 2008 it became so popular that it resulted in a nationwide banana shortage.

The diet was created by Hitoshi Watanabe who has studied preventative medicine and his wife Sumiko who is a pharmacist.

The Morning Banana Diet Basics

The creators of the Morning Banana Diet claim that eating only bananas and drinking room temperature water for breakfast leads to weight loss regardless of what is consumed for the rest of the day.

morning-banana-dietThe diet is extremely simple and easy to follow however many Japanese have reported rapid weight loss when experimenting with this diet.

One of the reasons why the diet may work is that bananas are said to improve digestion and boost metabolism. Another possibility is that bananas are high in resistant starch, which is a type of fiber that can promote the feeling of fullness and may block the absorption of some carbohydrates.

banana-dietThe reason why the water has to be room temperature is not certain but many theories have been speculated on the Internet such as that it improves digestion or reduces hunger.

Dieters are also advised to eat their evening meal before 8pm and to avoid desserts after dinner. If feeling very hungry it is acceptable to have a piece of fruit.

Aside from eating bananas for breakfast and avoiding late night eating another rule of the diet is that you must go to sleep before midnight every night. The rationale behind this advice is sound as scientific studies show a relationship between sleep deprivation and obesity

At all times dieters should follow the Japanese principle of eating until only 80% full.

Dairy products and alcohol are also not allowed on this diet. In addition the only beverage that may be consumed with meals is room temperature water.

Recommended Foods

Bananas – must be raw, not cooked and not frozen.

Sample Diet Plan


One or more bananas (as many as desired until full)
One glass lukewarm water


Meal of choice

Afternoon Snack

A small sweet snack is allowed around 3pm if hungry


Meal of choice but must be eaten before 8pm
No dessert

Low Calorie meal options can be found here.

Exercise Recommendations

Dieters are told they should exercise only if they want to.

You may want to try these exercises with the Morning Banana Diet.

Costs and Expenses

See The Morning Banana Diet Official Website


  • Eating breakfast every day may increase metabolism and reduce the likelihood of overeating later in the day.
  • Avoiding caffeine at breakfast may lead to more stable blood glucose levels and reduced appetite.
  • Not eating after 8pm will reduce tendency for late night snacking on high calorie foods.
  • Avoiding dairy products and dessert will reduce calories by limiting fat and sugar intake.
  • Bananas are a nutritious food and high in fiber, vitamins B6 and C and potassium.
  • Discourages overeating.


  • Some dieters may not respond well to a pure carbohydrate breakfast particularly those with hypoglycemia.
  • Easy for dieters to consume excess calories if they eat whatever they like for lunch and dinner.
  • Does not encourage exercise.
  • Does not address psychological factors involved in dieting.

Less Calories Still Key

If dieters are experiencing success on this diet it is not likely to be due to any special fat burning qualities of bananas. It is much more likely that it is related to following the other rules of the diet such as eating only at specific times of the day and avoiding desserts.

This will result in a reduction of calories that will promote weight loss so long as dieters do not consume excessive calories in their other meals.

 By Mizpah Matus B.Hlth.Sc(Hons)
  • amor

    Can we eat ripe and cooked saba?

  • laine

    some of bananas can cause constipation so what kind of banana is the best for this diet? pls answer tnx..

  • Eunice K Modibedi

    i’m a women of 50 years with body weight of 95kg and my blood group is B so i want to lose 25 kg because i have a big lower belly fat is realy iritate me a lot

  • Heidi

    I’ll try it and hope it works. Say hello from Germany.

  • nicky

    i realy want to try this i need to loose 30 kg by december . Please advice me on this iam desperate . Thanks

  • Marie

    Love bananas! I find ripe ones are tastier and sweeter. Unfortunately they should be avoided if you want to lose weight because they are higher in sugar. If not mistaken, greenish ones are the ones with complex carbs.
    So will try this diet but with “green” bananas. See what happens…

  • Chetna

    Hi I m very obese 85 kg I want to start this diet but I m scared as somebody comment she gaine 3pounds in. 3days what should I do?

  • Jessica

    how long should i do this to lose a lot of pounds?

  • Julie Denise

    I want to try this diet to lose 10 pounds. I’m just afraid that my breast size will decrease along with my weight lose… Can anyone tell me if they will?? It would be very much appreciated!! :)

  • Mila

    i am so excited. i’m trying it

  • dor

    Wow, sounds great, m off to market to buy some bananas. Thank you.

  • Leanne Prowse

    I have noticed that pretty much all of my Asian friends and colleagues drink warm/room temp water even in hot weather – some one said it was a medicinal thing – at least that is what she thought!

  • Naima

    Sounds nice ! Will try it tomorrow ..

  • Piya

    Gonna try it!!

  • maryam

    hey! can we have tea or coffee when on this diet?

  • Lisa

    not even worth it guys…
    i gained 3 pounds in 3 days cause of this diet.
    I even exercised as well, this may be because “everybody’s body is different” and that maybe be the case and you can give it a try and see if your body reacts in a more positive way. but from my opinion. It’s not worth it.

    • Doug

      You may have to eat bananas for lunch too

  • Judy

    Can I drink warm tea? Or does it have to be lukewarm water?
    I’ve started this diet for two days and its really simple. So I’ll respond back if it actually works.

  • aBBAS

    hi everyone i have also started today i ate two bananas with normal glass of water, what i have to ate in lunch and dinner can any one helped me????????

  • iamnotfat

    does this work i want to try it ? but dont wantvto waste time ‘ pleasebtell mebif its worth it :)

    • ilovethisdiet

      yes this works wonders! i went from 125 pound to 115 pounds within weeks!! this is definitley worth a shot! and guess what? i haven’t gained back a single pound!

      • sindy

        wat was your diet plan?

    • XXXXX

      I just watched a video about this diet on youtube and they said that the entire country of Japan ran out of bananas, giving that I guess it works but I’ve never tried it.

  • Craig

    I have tried various diets over the years including slimming pills however found the banana diet does actually work. I went on this diet a few years back which consisted of a banana for breakfast, banana for lunch and then a main meal for dinner. I also got into the habit of doing 30 sit ups per day. I would allow myself a SIN day on Saturday and eat/drink what I wanted. I found the first week the hardest but once you get your head round that the banana’s are purely fuel for your body, I settled into the plan easily. I lost alot of weight, had more energy and found that on my SIN day I stopped snacking or eating large meals as A) My stomach had shrunk, B) I didn’t feel a desire to snack, especially after seeing how much weight I had lost & how much healthier I was feeling.
    Just started back on the banana diet, on day 3 and already feeling positive about it (good job I like Banana’s)

  • Ila

    I’ve done just bananas at breakfast and sometimes one or two throughout the day. Didn’t even know it was a diet and increasing my water intake ex.. I think it’s helped because skipping breakfast or lunch just wasn’t cutting it. Apples also have a very cleansing affect to the body which I have been trying to do. Thinking positive even if you don’t have desired results right away really helps too.

  • Okorocharityifeoma

    Am from africa Nigeria am so pleased to hear this i will give it a try thanks

  • Ruby

    I am impressed from today only i will try and will let you know how much i have reduced.. Thanks!!

  • maiden

    I tried banana diet every morning with lukewarm water.

  • Sakura

    I’m on the diet now for cleansing. What I do is drink only water and vegetable purées. When I feel hungry, I have a banana. Then I sleep for 12 hours. It’s done wonders in three days!!!

  • charlotte

    potatoes make me sad, foods in high Gi make you loose weight as they keep you fuller for longer

    • steve

      they make me sad too….

  • DontEatThisEatThat

    All these comments and not one says “it worked for me”. I dont see how this would work anyway. But at least a banana for breakfast is better for you then eggs/bacon.

    • serdlc64

      Craig said it works.

  • nnn

    Can I have banana and plain water only to lose weight?

  • jed

    what kind of banana is require? I’m in the Philippines and we have a lot of bananas in here… is cooking banana ok?

    • alpa

      you can have green saba, cook it and there you go. i tried it and its really effective. i only had bananas for the whole day and nothing else and of course water which is very important. No soda, no rice at all. cut all sweets in your diet too.

  • jay

    pls advice me how many bananas can i eat perday,
    fot the moment now I’m doing weight lifting ,

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