Ditto on reliance on food.
And honestly, I smirk at people who do eat lunch. And it goes without saying what I think of leisure-lunchers.
I personally enjoy the pain of hunger as I code. That's why. I smirk in that I more fully realize my difference from others when I know they clearly do not enjoy that pain. I'm surely not saying it makes me better or smarter. I smirk in that I, in a way, come to know myself better: that I enjoy the pain of hunger, and what it looks like of others who do not, given the context.