I've fasted a similar amount to you spring echo, as well as a 30 day fast. I haven't noticed rapid hair growth. Prior to beginning fasting though I lived through winter on a small mountain here at 80 metres altitude continuing my barefoot shorts and tank top clothing habits. I did notice more body hair after doing that, and since then the change in temp from fasting I've hardly noticed. I'm think maybe the body hair growth some have during a longer fast is a reaction of the body to the lowered temperature.