Not hungry?

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This past week I have had zero appetite. There have been a couple of under 500 calorie days and today seems to be shaping up to be the same. I get buried in work and then suddenly it is 1:00 in the afternoon and I force myself to eat.

Anyone else have a rollercoaster like this? Yesterday I was famished and ate 100 calories over my daily; the day before I was under by 400+ and today I just have no appetite.

I am just rolling with it and feeding my body when it is hungry, but I'm wondering if anyone else has had this issue and if I should be worried?
Edit: Ironically, a few minutes after posting this, my stomach started to growl so I'm making myself some lunch. HA!