Antifoam agent

Why is the defoamer called "industrial monosodium glutamate (MSG)"? MSG is a delicious compound that can be said to be omnipresent in everyone's nutritional life. I think that in industrial production, it is a compound similar to monosodium glutamate (MSG), and the demand is not too high, but the role is very peculiar, and it is "defoamer". In the vast majority of applications, there is no need to...