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Lol, more practically you could get something like this!

Or, if you live in a cold climate, you could make a thermo-electric generator vest to wear around town.

Good point, but given there are neurons in the belly, would you be unable to process emotions or be in a really fancy mood after charging your phone?

Is there any ongoing development of implants to "burn" fat in-place, converting it to something more readily metabolized ? (glucose?)