This is why I said "typically does not" instead of never. Some people's immune systems will go ape shit and get every possible symptom under the sun, and children's immune systems/reactions can be more stressed till they build some strength and have more exposures through life so their bodies learn how to handle them.
But if someone has a bad day that they're throwing up/have diarrhea (no stuffy nose, congestion, or other respiratory symptoms) then chances are they consumed something their body is trying to reject.
That's the difference between gray matter and white matter. Gray matter readily communicates with it's crowding neighbors and can retain information, while white matter is myelinated so it can send messages over distances. Gray matter extends from our brains down our spinal cords.
Muscles are dumb meat who take their orders from the nervous system. They have no capacity for memory. But training can create reflexes at the spinal cord level which some refer to as "muscle memory," except it's not the muscle that should get the credit here.