I put "Soda" (with proper sugar, none of this HFCS crap!). I'll usually have 1-2 cans of regular Coke per day. I try to keep it to 1, but tend to fail much more at this when working from home.
In addition, I'll often go for a late morning snack. Coffee scroll, Donut, Chocolate Bar, etc. It varies depending on where I'm working and what stores are nearby. I think the act of going out for a walk is as much a factor as the actual food.