My grandma alleges that she's thirsty after a meal that doesn't taste salty, if and only if the food contains MSG (monosodium glutamate). Is she correct?
She doesn't believe the answers in this Quora post that NaCl is the cause for two reasons:
during the meal, she's not thirsty and she doesn't taste anything salty.
she hardly uses NaCl in her home cooking. So if there were salt, she'd taste it and react.