That's not Yoshiki quoting his mom, his mother told this story in We Are X herself, in her own voice, that Yoshiki was born a very weak baby and doctors told her he would
likely not reach adulthood.
I think, drumming helped to improve his overall health (and ironically, ruined it later on). You really need to be in good physical condition to drum, especially speed metal that he did when he was younger. We have seen people survive stuff doctors said would be not possible, so I am not surprised that he did survive, despite what doctors predicted. He has an exceptionally strong willpower, he can
rule his body. That's an amazing feat. I don't know how to do that, I am trying to learn to do it. Whenever I am crazy suffering at the gym at failure/break point with repetitions, I remind myself that my body is giving me fake signals to stop because I am used to a low pain tolerance level (minor headache? Pop a painkiller immediately...). Yoshiki actually inspires me to endure the pain in gym and not think like "omg it's painful so I must stop otherwise my arm will fall off"
Because it won't, of course.
off: Yoshiki obviously has fake teeth.
But most Western stars do, too. I know Japanese kind of like the messy teeth like Toshi has, but Yoshiki has been living in the US for so long. I don't mind teeth implants. I myself had my teeth straightened out with braces, so...