Why do I feel drunk after eating?

Lately after I eat I've been feeling drunk. The room doesn't spin or anything like that, but I definitely feel like I just chugged down a few beers. This has been occurring for about the last week now. I had some blood work done a few weeks ago for something unrelated, and the results came back fine. Other than my iron being a little low, my blood work was fine. I'm not diabetic, I don't have any serious vitamin or mineral deficiencies, my blood pressure is normal, I don't have any food allergies other than shell fish, and I'm not experiencing any pain or other symptoms.  This doesn't happen all the time, typically when I eat after a workout (I wait 2 or 2 1/2 hours), or after a large meal. Any idea what might cause this?