I have had a decrease in the frequency of migraines while following Atkins correctly. Now when I indulge in caffeine, sugar free products, ASPARTAME, or too much dairy it tends to trigger headaches for me.

Staying away from caffeine is probably one of the best things you can do as a migraine sufferer. Of course, when I take medication for it, it has caffeine, but you know. I think a lot of my migraines were triggered by blood sugar problems and food intolerances, so yeah, it's helped.