As he said that he is not on drugs or take pills still he got this disease that very likely because of genetic issue.
For majority it is because of unhealthy lifestyle. This case of Yahoo is different, it is genetic. He cannot do much about it other than following his doctors advice seriously.
As I attempted to suggest earlier, I doubt that it would be possible to rule all aspects of various conditions that any of us have, including Yahoo, in terms of genetics, which kind of seem to suggest that there is nothing that we did or that we could have done to have had improved our situation, whether it is clean lifestyle in terms of eating, sleep and exercise or whether there might have been some things that doctors could have done in terms of detecting issue, medicines and or surgeries in order to nip the situation in the bud or to perhaps mitigate aspects of the problem getting worse.
Since Yahoo surgery is inevitable at the moment, we all wish Yahoo best of luck for his surgery and a healthy future. His services for this platform are huge and we pray for his quick recovery.