Fasting can prevent puking, what would you puke if there isn't anything in your stomach? I'm not 100% sure that would stop it entirely.
Someone already mentioned what I was going to say about drinking and attempting, it's going to mess with how you can function, which is what I meant by "depending on your method."
It wouldn't affect jumping, but it could affect your ability to hang or OD. At least that's how I think.