I took the “no Aspartame test” some ten years ago now after hearing that it caused headaches and depression. I was in the middle of a major depressive episode, and had been drinking some 6-8 Diet Cokes per day (I was in college; it was available at meals and I was trying to watch my weight). After a couple of months off of the soda, I was at a speaking competition and doing very well, so in a good mood and functioning well.
I purchased a can of diet soda and drank it; within minutes I felt teary and was shaking. I’ve not had so much as a stick of NutraSweet gum since that time and have had no more depressive episodes. I attribute this to staying off of NutraSweet.
Thanks for spreading around the information–I’ve passed it on to friends and family too.