He'll keep you busy... and honest. It is probably time to move on to saying "I don't think the slurpee is a healthy choice for today and we are not going to buy it."
Weeelll, I left part of the conversation out for dramatic effect.
If DW had said that, then he would have cataloged what he ate that day, asked which was healthy or not, and why, then argued about each one, then still kept pushing. Then, tomorrow, he would have eaten what we considered healthy and announced that since he ate healthy we should go to racetrac and get a slurpee.
He gets his oral interrogative skills from both DW and me.