"The amounts in the studies don't conform to my culinary preferences" doesn't amount to "MSG doesn't cause headaches".
If the small amounts of MSG that you prefer caused headaches in a significant fraction of the general population, it would not be usable at all, and we wouldn't be here talking about it.
There is a combination of circumstances: most people seem to tolerate larger amounts, whereas a few people don't. And, outside of carefully controlled name-brand processed foods, misuse can happen: the problematic quantities are not that far-fetched. A stray teaspoon here or there can be critical.
It's a recipe, pardon the pun, for a controversial issue.
If the small amounts of MSG that you prefer caused headaches in a significant fraction of the general population, it would not be usable at all, and we wouldn't be here talking about it.
There is a combination of circumstances: most people seem to tolerate larger amounts, whereas a few people don't. And, outside of carefully controlled name-brand processed foods, misuse can happen: the problematic quantities are not that far-fetched. A stray teaspoon here or there can be critical.
It's a recipe, pardon the pun, for a controversial issue.