I can’t have anything diet without a migraine attack lasting several days. The last time was a piece of gum with NutraSweet. I was in bed 2 days. I’d say there’s a link, but that’s based only on my own experience.
I know that I can’t take much NutraSweet. It gives me headaches big time! There has been research on it and I know for a fact that pilots are strongly advised NOT to drink/eat any NutraSweet before a flight.
I don’t think it is good stuff for a lot of people.