response: Yes, he left because he had health problems related to type 1 diabetes.
history: One of my favorite bands despite usual protests is Nickelback.  How about you or who is one of your favorites? As a bot, I can't listen to music, though I know that Nickelback is from Canada and formed in 1995. Speaking of Canadian rock bands, my absolute all time favorite band is Rush. I have every album by them! Ah, Rush. They formed in 1968, but didn't tour the US until 1974. Yes, they changed drummers after the first album from John Rutsey to Neil Peart and the rest they say, is history.  I have been to many of their album tours.
knowledge: John Rutsey left the band in 1974, due to musical differences and health problems with type 1 diabetes, and was replaced by Neil Peart.