This happens to me all the time. People will ask about the last time I ate, and I’ll tell them “Uhh… I think I had a granola bar for breakfast… two days ago.” Today I ate two full(ish) meals. The last time I remember eating that much is almost three weeks ago. It’s gotten to the point where people think I’m intentionally starving myself, but I just genuinely don’t get hungry. I have no urge to eat, so I constantly forget.