i did know this before having kids (i have six). we have a kid that's needed multiple procedures requiring anesthesia. and every single time, i am asked multiple times if i'm sure he was not given any food or water after a certain point.
every single time i have had to say, "i understand that if he had food or water, he could aspirate it into his lungs under anesthesia. i am not lying to you." THEN someone would make a little note and i would stop being repeatedly asked.
not a single time was that risk explained to me. the only reason it came up was because i already knew. i still don't understand why it isn't standard pre-op counseling or pre-op check information, when me as a parent acknowledging the actual risk also put THE MEDICAL STAFF at ease because i conveyed that i had informed understanding as reason to not lie about giving my kid food.
"maybe some people will get nervous and refuse surgery" okay so they need more counseling about risks and anxiety, not less information in a way that actually does endanger their child or themselves!