If you want to learn how to live longer, look at the people of Okinawa, a string of islands in south-western Japan. Raised on a diet of fish and soyabeans, their life expectancy is among the highest on Earth. There is a natural control group; many Okinawans fled to Brazil and Hawaii after the second world war, where they switched to a meatier diet of steaks and burgers. All have been studied regularly by Japanese researchers over the past three decades to prove that a soya-rich diet can prolong life. Now it is time for the taste test: can a healthy bag of soya nibbles sweep the fatty potato snack off the table?
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