I don't think your body "knows". I think your mind is very, very good at pattern recognition. It knows that when certain signals exist, a certain condition ex

I don't think your body "knows". I think your mind is very, very good at pattern recognition. It knows that when certain signals exist, a certain condition exists, and when certain foods are eaten, those signals are lessened. It doesn't know what foods will do what until after you've eaten them, possibly multiple times.