Why do I feel drowsy after I eat?

Anonymous
Recently, I've been starting to get very drowsy after I eat. I'm not fat though. I'm far from fat due to my superhuman metabolism. Eating has made me feel tired at all in the past several years. I'm at work just ate a big dinner because I was starving and now as I'm typing this question my hands feel heavy as well as my eyes. I'm not even full from the dinner but I feel drowsy and this happened a few days ago and even then it wasn't even a big meal.
Why do I feel drowsy after I eat?
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