There's an interview with J.C.Staff founder Tomoyuki Miyata making the rounds right now (Japanese language original: https://animan634.com/interview/231215_int_

There's an interview with J.C.Staff founder Tomoyuki Miyata making the rounds right now (Japanese language original: https://animan634.com/interview/231215_int_2_1.html https://animan634.com/interview/231215_int_2_1.html; English language summary: https://www.cbr.com/jc-staff-anime-studio-founder-work-stress-stomach-remove/ https://www.cbr.com/jc-staff-anime-studio-founder-work-stres...) where he talks about how he developed a severe stomach ulcer from work-related stress, had to have 2/3 of his stomach removed, and was back at work 10 days after surgery.