A Japanese pharmacist, Sumiko Watanabe, designed the diet to speed up the metabolism of her overweight husband. The diet was successful for him and has received media coverage.
Over 730,000 books about the diet were sold in the first seven months from it being published in March 2008. The book has been translated and published in Taiwan and South Korea.
Bananas are hardly the first fad diet to create shortages in Japan’s consumer markets. During the 1970s, there were similar runs on black tea fungus, oolong tea and konnyaku; during the 1980s it was baby formula, banana and boiled egg; then, in the ’90s, came apple, nata de coco, cocoa and chili pepper; and during this decade black vinegar, carrot juice, soy milk, beer yeast and toasted soybean flour (kinako). Last year’s fermented soybean (natto) diet emptied supermarket shelves. Based on experience, Horiuchi predicts that the banana boom will last only another month or so. “In the past, there were all kinds of hit diets. But they never last, do they? So, we don’t really want to end up with an uncontrollable banana surplus.”
here is an article from the NY Dailytimes.
The plan is simple: Eat only fresh bananas for breakfast or brunch with sips of lukewarm water, enjoy a normal lunch, afternoon snack and dinner – no desserts – before 8 p.m. and be in bed before midnight. Exercise is optional.
A couple of days into trying the plan, I have to admit it’s easy. Two bananas keep me full until lunch, which, according to the rules, can be anything as long as there’s no dessert. Making the effort to eat before 8 and get to bed before midnight sounds more like common sense than a fad diet, but by day three I’m getting bored of eating only bananas for breakfast – and the scales haven’t moved.
Internet forums like Morningbanana.com wax lyrical on the supposed metabolism-boosting resistant starch found in slightly green bananas, and many repeat the story of a Japanese actress who lost 26 pounds on the diet.
Most people have only just begun the diet, and there’s a curious lack of impressive first-person weight-loss stories posted, suggesting that the banana alone may not be the magic bullet for weight loss that it’s touted to be.
“There’s nothing magical about a banana,” says Bonnie Taub-Dix, a New York-based dietitian and national spokeswoman for the American Dietetic Association.
“It’s high in fiber and a very rich fruit, so it’s going to make you feel full, but instead of the morning banana diet, you could make it the morning yogurt diet, and you’d be getting a better blend of nutrients.”
The biggest problem, says Taub-Dix, is the lack of clear calorie guidelines, plus instructions that include “exercise only if you want to” and “eat anything you want for lunch and dinner.”
“It’s not well-defined or scientifically based,” she says. “Whenever you have a diet that says eat all you want, there’s the possibility that people who are prone to overeating will have problems.”
And with anywhere from one to four bananas allowed for breakfast, there’s even more scope for calorie confusion.
“Bananas can range anywhere from 60 calories to 180 depending on their size, and it’s all about how many calories you eat at the end of the day,” says Lisa Sasson, clinical associate professor of nutrition and food studies at NYU, who calls the metabolism-boosting claims of the diet “preposterous.”