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The Promise

Get ready to go bananas! But that's not all you'll eat on this plan.

The Morning Banana Diet, also known as Asa-Banana Diet, comes from a husband and wife in Japan: Sumiko Watanabe is a pharmacist and preventive medicine expert. Her husband, Hamachi, has studied traditional Chinese medicine and counseling at the Japan Body Care Academy.

The diet encourages you to eat fruit, become aware of your hunger and fullness levels, and eat dinner by 8 p.m. There aren’t strict meal plans or calorie counts. For lunch and dinner, you’ll eat what you always have, but stop when you’re 80% full, and you’ll skip dessert after dinner.

The plan also recommends you go to bed by midnight and stresses the importance of a good night’s sleep, as well as keeping a diet journal.

You could lose weight simply because you’re eating fewer calories. Besides testimonials, there is no proof that this diet works.

What You Can Eat and What You Can't

There are different versions of the diet, but the overall themes are similar.

For breakfast, you will eat bananas and drink room-temperature water. The bananas must be raw, never cooked or frozen. You may substitute other fruit, but only one type per meal. If you are still hungry, wait 15 to 30 minutes and you can eat something else.

You will eat normally for lunch and dinner. The diet says you can eat whatever you want, but it recommends Japanese food, especially rice for lunch.

You are allowed only one snack each day in the afternoon, which is also the only time sweets are allowed.

The diet also recommends avoiding dairy and ice cream most of the time.

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