You know, it's not enough for you to subsist entirely on society's waste. In a way, you realize, that makes you kind of a parasite. You need to make your own food! You'll always benefit from society, you know, but you need as much self-esteem as possible, living alone down here. So you decide to become a fearsome sewer hunter in addition to a skilled sewer forager. Now that you think about it a little more, you can't image what kind of horrible chemicals and toxins you're taking in through your current diet of discarded junk food and restaurant left-overs. Genetically modified corn, high fructose corn syrup... your diet needs more fresh, wild, organic meat. Too bad you've mostly seen rats down here.