A lot of people report headaches the first week or so. A real lack of energy, too.
1. Make sure to eat enough food, particularly fat, in the first week or two. Your body is adjusting and needs the time and energy. I'm not sure why the headaches are a there, but that seems to go with the change from higher carbs to low carbing.
2. If you cut out coffee in an attempt to get healthy, start drinking it again. You'd be surprised how often people revamp their whole lifestyle at once...
