Comment by photoJ

Dehydration and an electrolyte imbalance (in particular lack of sodium) causes both "foggyness" and general confusion in people of all ages. In otherwise healthy American's its rare to have a lack of sodium, but in the ketosis community especially at the start, its something even they have to pay attention to. This is part of the problem with trying treat such diseases is that there are many things co-occurring. Along the same lines, lack of magnesium is very common. Both coffee and booze leach it from ones system, many american adults are encouraged to take a supplement. Lethargy(i.e. lack of focus), rather than disorientation tends to be symptomatic.