But then, after many years of promotion and research, he discovered that heavy consumption of soy products could lead to thyroid enlargement. To overcome this problem, at his own expense he went to study at Kyoto University in Japan, where he discovered a simple formula for adding iodine to the soymilk.
然而經過多年的推廣與研究，他又發現，食用黃豆易引發甲狀腺腫大，於是他自費再到日本京都大學研究一年，找出了簡易的「加碘適量公式」，有效克服問題。