I don't know if it's a direct correlation, but my hair has been growing much faster since the switch to Primal. I notice this because I need to color my roots every 4 weeks now, I used to be able to go for about 3 months between colorings.
Stumbled into Primal due to food allergies, and subsequent elimination of non-primal foods.
Start Gluten-Free/Soy-Free: December 2012; start weight 158lbs, Ladies size 6
Start Primal: March 2013, start weight 150lbs, Ladies size 6
Current: 132lbs, Ladies size 2
26lbs lost since cutting the crap.