Why is it that you need him to eat them? I just wonder because it wouldn't actually bother me. I know from your other posts that your family has a great diet so it won't effect him much will it?

My kids eat healthy foods and rarely have any 'junk' so if they go off something for a bit I don't worry because they aren't filling up on bad stuff or anything. I just continue to put it on their plate though and am pleasantly surprised when eventually they start eating it again.

I do think he's a little young to insist he tries it and it could just make meal times a battle so that's what I'd do.

HTH