Cats just don't have a significantly diminished appetite for no reason at all. It's been two days, if this continues tomorrow morning, you should be making a vet appointment. I'd try to get a dose of hairball remedy into him tonight.
A cat that eats less than half of it's normal intake for more than a day or two is at risk for fatty liver disease, especially if the cat is overweight.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...