著者

Hideyuki Imai Hiroto Nishikawa Asami Suzuki Eriko Kodama Tatsuya Iida Kentaro Mikura Mai Hashizume Yasuyoshi Kigawa Rie Tadokoro Chiho Sugisawa Kei Endo Toru Iizaka Fumiko Otsuka Shoichiro Nagasaka

出版者

The Japanese Society of Internal Medicine

雑誌

Internal Medicine (ISSN:09182918)

巻号頁・発行日

vol.61, no.19, pp.2899-2903, 2022-10-01 (Released:2022-10-01)

参考文献数

23

被引用文献数

1 8

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A 54-year-old man had been drinking approximately 1.2 L of soy milk (equivalent to approximately 310 mg of isoflavones) per day for the previous 3 years. He then developed erectile dysfunction and gynecomastia. On an examination in our department in May, blood tests showed low gonadotropin and testosterone levels, indicative of secondary hypogonadism. He stopped drinking soy milk on his own in June of that year. When he was admitted in August, blood tests showed an improved gonadal function. Secondary hypogonadism caused by the excessive intake of isoflavones in soy milk was diagnosed. In men, an excessive intake of isoflavones may cause feminization and secondary hypogonadism.