[quote=@Lolita Complex]
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Soul Gems are what contain the girl's consciousness. Magical Girls can survive even if their head is completely destroyed, as long as they're properly repaired with magic. 

I mean, they're basically liches. As long as their phylactery is intact and they're not witchified, they can't die.
[/quote]

Me and some friends have also extrapolated that magical girls also don't need to eat or sleep, though going to such lengths would require knowing the lich bomb, and probably wouldn't feel all that good at first given how your brain is hardwired to do that stuff. Also, it's questionable whether magical girls can become drunk. Magic is one hell of a drug. 

Not that it's relevant, just noting it. :lol