I just started Phase I for the first time ever on Monday. I had headaches too. I figured it was a sugar withdrawal type thing, so I had some Crystal Light (contains sugar alcohols instead of sugar/corn syrup) along with my regular 64 oz. of water. It's day 5 for me and I feel fine. My headaches lasted 3-4 days...I had a very mild one yesterday but not nearly what I had on Tuesday.
Honestly, the only reason I stuck it out was because I've already started seeing a difference on the scale...a drastic one compared to pre-SBD. It's so very worth it.
