Yes. On the opposite side of the blue form, there is a table for specifying your declaration (food items, or all items if you are over your allowed amount). Table has a spot to describe the item and for the amount. In practice, I think most people either don't realize its there.

For me, personally, I would rather answer yes to the food question and get the why are you wasting my time, go on, by an agent then get GE (well, Nexus) potentially revoked if they found it and I didn't.

Actually, I did have that happen to me about a year ago in pre-clearance YYZ, where I had cheese bagels (literally - bagels filled with cottage cheese as opposed to, say a Brueggers type bagel with a little cheese on top). I answered yes on the kiosk, and at secondary, said I had cheese bagels, and before I could say another word, the agent did the why are you wasting my time, get out of here, thing. I certainly had no interest in completing the explanation - I got told to go on, so that's what I did.