Ticklish, DD also doesn't eat a lot a dinner and most afternoons she wont have afternoon tea. I have swapped her meals because she does eat a lot for breakfast and lunch.

The difficult thing though is to try not to make a big deal about it. If he refuses to eat, let him. If you are worried about him not eating anything, offer something plain but still healthy like yogurt. DD eats reasonably well most the time but she does go through phases were she doesn't want to eat anything. I try not to react and just let her hope down from the table and don't offer her anything until the next planned meal. It seems to work and we dont' really have any meal time 'battles'
Good luck