Three South Korean professors sat in a small office at the American Sports Institute in Mill Valley recently to talk about fat children. South Korean children have gotten so fat in the past few years, you'd think they were Americans. "Along with a Westernized diet, South Korea is No. 1 or No.2 in the world in terms of Internet use,'' said Seongho Lee of Chungang University in Seoul. "More than 90 percent of students spend more than four hours a day on the computer.'' San Francisco Chronicle