Interesting post. BTW, there was a TV program I watched a while back on discovery/history talking about many models are (term for food-hating problem???) and live a degrading life pressured by public interest in a slim look. Don't do it! It's unhealthy to rip nutrient off your body to make certain parts look slim, which should be storing some healthy fats as backup batteries.
Oh, the project is only half the story of energy problem. You need efficient storage, and efficient charging/discharging methods. Batteries are good for slow discharge rates and charge rates while gas is good for fast rates. How are you going to charge fat? Going to a pig farm for more fat or having a fuel cell eat corn for a while and poop?!