Japanese anesthesiologist "Ta-chan" died at the age of 51. He once invested 500,000 yen and accumulated more than 8 billion yen in assets.

2026/09/23 11:32

Japan's well-known anesthesiologist and billionaire investor "Ta-chan" (たーちゃん) recently passed away at the age of 51. (photographed from the Internet)

[Health Channel/Comprehensive Report] Japan's well-known anesthesiologist and billionaire investor "Ta-chan" (たーちゃん) wrote "Teachings from a father who became an investor from 500,000 yen to 5 billion yen" to his daughter. Unfortunately, he died of illness at the age of 51. He was diagnosed with rectal cancer in 2022. Family medicine physician Wang Ziyun reminds that risk factors for rectal cancer include: increasing age, first-degree relatives with colorectal cancer or advanced adenoma, past history of adenoma or colorectal cancer, ulcerative colitis and other chronic inflammatory bowel diseases, especially staying up late to watch stocks is similar to night shift work. Studies have confirmed that it may cause rectal cancer, colon cancer and other cancers.

During his lifetime, Tajiang invested 500,000 yen (approximately NT$100,000) in stocks. Even though he suffered from fourth-stage rectal cancer, he continued to invest, accumulating more than 8 billion yen (approximately NT$1.6 billion) in assets. His investment experience and philosophy attracted the attention of the Japanese investment circle.

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Wang Ziyun shared on Facebook "Dr. Wang Ziyun. My ageless secret." I saw this famous Japanese doctor who started playing stocks when he was a medical student. He accumulated assets of NT$20 million through investment at the age of 30, and accumulated NT$200 million at the age of 38. After annual dividends of NT$6 million, he quit his job as a doctor to become a full-time investor, but returned to the medical field about half a year later. He believed that "a life with too much time on weekdays" was not suitable for him. However, he was diagnosed with rectal cancer at the age of 47, metastasized 2 years later, and died 2 years after that. In other words, 1.6 billion cannot buy a healthy body.

Wang Ziyun said that rectal cancer is usually studied together with colon cancer as colorectal cancer (CRC). Relatively clear risk factors include: increasing age, first-degree relatives with colorectal cancer or advanced adenoma, genetic diseases such as Lynch syndrome/FAP, past adenoma or colorectal cancer, chronic inflammatory bowel disease such as ulcerative colitis or Crohn’s colitis; lifestyle aspects include obesity, lack of exercise, smoking, higher alcohol intake, and a diet with more red meat/processed meat and less dietary fiber.

Will staying up late to read stocks affect your health?

What would be the problem if we stay up late every night for "years" and are exposed to light at night, resulting in persistent circadian rhythm disorders? Wang Ziyun said that the International Agency for Research on Cancer (IARC) has classified night shift work as Group 2A: it may cause human cancer. The limited evidence from human studies includes breast cancer, prostate cancer, colon cancer, and rectal cancer. Reasons may include: changes in melatonin rhythm caused by nighttime light exposure, changes in circadian rhythm, and subsequent metabolic, immune, and inflammatory changes.

She then cited prospective data published in the journal "Cancer Epidemiol Biomarkers & Prevention" in 2023 and found that those who worked night shifts for ≥10 years had a 1.64 times risk of colorectal cancer compared with those who had never worked night shifts, but the author also emphasized that larger studies are still needed for confirmation.

Wang Ziyun reminded that investment must have risks. There is no investment in this world that is guaranteed to make money without losing money. If you make money, you may lose your health. She also bluntly said that on July 12 this year, he posted a message on the platform to celebrate his 51st birthday, and mentioned that "this is a 51st birthday that the attending physician once said was difficult for me to celebrate." She felt that he was still optimistic and did not regret the choices he made along the way.

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The principal of 100,000 is rolled out to 1.6 billion! A famous Japanese anesthesiologist died of illness, but he still picked stocks until the last minute despite terminal cancer

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