Food pills--open your eyes (Score 1)

Several of you have made a mistake of stating that it is a fundamental physical limitation that food cannot be taken in pill form. Granted, for an active adult male, it would take close to a half-pound of pure fat a day to meet energy requirements. Let's not forget, though, that the whole point of eating is to produce energy in form of ATP. Clearly, eating ATP pills ain't gonna do much, since you probably burn your body weight in ATP every day--it's made and used very rapidly. The solution--pills with enzymes that produce larger molecules--sugars, fats, maybe ATP itself--from carbon dioxide and water in the air. Yes, just like plants, a la photosynthesis. After all, skin is the largest organ, why not put it to work? It's perfect--we expell CO2 and H2O in respiration, so if we recycle it, all we need is sunlight, and we even would produce oxygen in the process. It goes further--since you don't need outside oxygen anymore, you can live underwater in bright sunlight. My guess is the pill will be eventually eliminated altogether, and photosynthetic enzymes simply incoroporated into human genome. Green-skinned humans, anyone? If that's too radical for you, consider the other scenario--"overpopulation and famine" . Modification of digestive enzymes will be needed, to allow humans to survive on things like cellulose (i.e. grass and trees). GM foods are already here, and GM humans are around the corner! Resistance is futile; you will be assimilated!