By Tomohiro Osaki and Sarah Lai / AFP, KAMAKURA, Japan Sticky, translucent strings dangle from Wesley Smith’s chopsticks as the American tourist relishes his natto, the loved-and-hated Japanese fermented soybean superfood going global one slimy mouthful at a time. The latest trade statistics show Japan’s exports of the highly nutritious gooey beans tripled from 2017 to 5,248 tonnes last year, with China and the US topping the list of destinations.