I lost 50lbs on IP 3 years ago. I did experience noticeable (to me) hair loss as I started to phase off after 4 months on program with no cheats. I too had normal labwork. Search Dr. Michael Eades, kimkin's diet, hair loss. He has an explanation which he wrote a while back in response to hair loss with a diet called the Kimkin's Diet., also low carb, low calorie. This makes perfect sense to me. The bad news is there is probably nothing we can do to stop it. The good news is all my hair grew back. No one else noticed my hair. It was unnerving to me to have long strands fall out. I understand it now and it was totally worth it. Remember, Dr. Chan says this is an unbalanced diet, and it is! But it works.