@SingingThroughTheStorm:
Oh, sorry. It was Zeff.
I stated it was kid Sanji so I thought people would know Zeff.
Anime it was chain, Manga it was an eaten leg.
Is it possible to eat your body parts?
If you have the guts to do it, will it keep you from starving?
Well in the real world if you didnt die of blood loss you would most likely get a life threatening infection after cutting off one of your own limbs. But in shounen world, anything goes!
Even if you had some way of sterlizing and disinfecting the wound after chopping it off (and Zeff didnt even do that, he smashed the bone with a rock and just ripped his leg off I guess) youd have to be conscious afterwards to cauterize and sterilize the wound, laying unconscious and bleeding for a few hours would probably not leave you enough time to wake up and stop anything nasty from happening.