Another vote for hypoglycemia. My daughter goes from not hungry to ravenous in 30 seconds flat. In fact, I could ask her if she wants dinner and she can say no, not right now and then 10 minutes later she is demanding food and when I ask her why she told me she wasn't hungry she gets very upset. I choose to make light of it and call it HANGRY (hunger that turns into anger) and ask her if she can please let me know when she needs food BEFORE her hunger turns to hanger. LOL At any rate, I think frequent small snacks that are nutritious (protein and carb together) that last longer are the key.
