I had my first of two seizures 9 years ago right after losing 30 pounds in 3 months on a diet filled with NutraSweet. The cause of my seizures was never figured out, but the neurologist said that NutraSweet can cause all kinds of neurological disturbances and to never touch the stuff again.
Once, a couple of years ago, I drank some tea with some in it, by accident and got light headed. Afterward, someone told me there was NutraSweet in it. So, I definitely hold stock in the NutraSweet theory. You should read up on NutraSweet. It basically is poison. Lose weight some other way, i.e. watch your fat intake!