answer:Well, if such technology was widespread, it would effectively eliminate famine and starvation. I think also that if we didn’t need to eat to live, we would eat mainly for enjoyment and for the non-energy benefits of food (like fiber). Thus, good-tasting food would be in high demand, and nutritious food would be unnecessary. Other than that, I’m not sure what the impact on the food industry would be, but I’m sure it would be massive. Not having to spend money on food would also free funds up for other items, and would go a long way towards alleviating poverty (you have more money to spend on, say, education when you don’t have to worry about putting food on the table), as well as the obesity and malnutrition problems many people suffer from. So, although I don’t know how feasible human photosynthesis would actually be, I think the benefits it would deliver (supposing it were widely available) would outweigh whatever downsides it would have.