Had cats all my life. The ex once bought me a T-shirt that says "Cat Whisperer" which I still have. If this is just the first time I'd keep an eye on it but not panic yet. More than that it's in the carrier and off to the vet. Eating is a good sign.
I'm sorry Streetwise...just re-read my response and it sounded like I'm calling him an "it". I didn't mean to and I know better. =o(
My girl Katie (lost to dementia at 18) once decided to eat the shiny tinsel off of the Christmas tree and left similar presents for me to find in the box for a week. I'd be vigilant but aware that it doesn't have to be serious.