I am a Japanese registered dietician (RD) and nutrition researcher (PhD) living in the U.S. and I recently discovered this wonderful book. The Okinawa Diet Plan is without a doubt the best diet book I have seen. It offers easy to follow dietary advice that teaches the reader how to choose the healthiest carbs, proteins and fats. Great recipes too! It is by far the best diet plan for long-term health, it is high in antioxidants and suggests new foods that promote healthy weight and longevity. I lost 30 pounds over 8 weeks without any major life changes, just some simple rules for eating. And I have KEPT the fat off. I have never felt better!!
One thing that concerns me about some of the reviews for this book is how some people in the US call themselves nutrition experts or dieticians without proper training and then profess to know something about the Okinawan eating habits because they read a few research papers and got confused about the data.
Some even say that soy might have adverse health effects. While we should always try to look at all the evidence this is not very likely. The Okinawans have eaten more soy that anyone in history and are the world's healthiest people. That should say something. Until recently the second most common occupation of Okinawan women was tofu maker. Many of the centenarians in Okinawa used to be tofu makers. That would suggest soybean curd (tofu) is pretty good for you.
Unfortunately, soy consumption has been declining in Okinawa for the last few decades--mostly among young people. This, I believe, is one of the reasons that younger people in Okinawa are less healthy than the elders. I think it is because they eat LESS soy, less vegetables, and MORE red meat than the elders. The Okinawans were never vegetarians but they always ate lots of veggies, legumes (like soy), fish and used small pieces of lean meat as a garnish or in stir-fry dishes, like the Chinese have traditionally done. Soy is the elders' main protein.
The average soy consumption (tofu, miso, etc) was around 75 grams per day in the old days but some people ate more, up to 120 grams per day. Currently, young people are eating less soy at only 25 or so grams per day but the high consumption in older people brings the population average up. Perhaps that is one reason why young people are not as healthy as in the old days but older people, who still eat a lot of soy, are the healthiest in the world. I say all this about soy because several reviewers seem confused about what the elder Okinawans eat and what the younger Okinawans eat.
Also a comment on longevity genes. Genes are important for ANY population for longevity. Perhaps up to a third of lifespan is genetically determined according to Drs Willcox and Suzuki. Of course, centenarians are more likely to have better genes than most of us since people with bad genes generally die younger---unless we have a very healthy lifestyle. So why so many centenarians in Okinawa? Add the healthiest lifestyle in the world to good genes and you get an amazingly healthy population. It's the best combination for longevity.
This simply means that those of us who are not genetically blessed have to pay more attention to our lifestyles. A thorough read of the Okinawa Diet Plan will help you either way BUT especially if you have bad genes. That's the whole point of the book. It will get you lean, healthy and long-lived despite your genes (while eating plenty of calorie light tasty food)!
I also read that some people think that Okinawans eat a high fat and high meat diet. That depends on your perspective. Okinawans USED TO eat lard for fat in the old days. But overall fat in the diet was so LOW (less than 10% of calories) that they really needed it. Fat is essential in any diet. The body needs fat to make hormones, cell walls, etc. Japan began to import a soy/canola oil blend in the late 1970s and early 1980s which was easier to use and tastier than lard (and much healthier) so everyone began using that, including Okinawans. Not surprising since rapeseed plants (where canola comes from) have been eaten for centuries in Japan. Meat consumption is higher than the old days when they may have eaten meat once a week at best. It is now only about 100 grams per day, which is much lower than the 200 or so grams per day in Americans. Again the elders eat much less and young people more than this average. Meat is still used mainly as a garnish in stir-fry meals in the elders not as a main dish.
So what is the take home message? Eat lots of soy if you like it because it's a very healthy protein. Use canola oil, or olive oil or another healthy type of oil in moderation (see Okinawa Diet Plan for other healthy oils). And if you eat meat, don't overdo it. Try one of the Okinawa doctor's rules---the plate should be 1/4 or less animal products and 3/4 or more plant products and not the other way around. And of course use lots of antioxidant-rich healthy Okinawan herbs and spices like turmeric, peppers and mugwort. It's all about balance--that's the Okinawa Way. Nuchi gusui (Food is medicine!).