It gives me incredible headaches. It took me a long time to figure out what was causing them. I blamed it on nerves, anxiety, and anything else you can think of. I was popping Tylenol like candy. That was about 12 years ago. Since then, I've given up diet soda and sugar free almost everything. Now I drink water and herbal tea. If I want something sweet, I for the non diet stuff.

I've read that it can give you MS symptoms too - not sure if thats true or not. But its nasty stuff.