I watch my blood sugar - so it does matter to me. If I need a snack before going home I just eat the same stuff I snack on throughout the day. On my desk now I have raisins, a bag of mini-bagels, apples, two bananas rapidly going bad, and of course peanut butter. I always keep a couple Cliff Bars in my bag, but rarely use them.
Before leaving I always have yogurt.