Just received this interesting information from a fellow mom friend, Betsy.
Up to 50% of autism kids test positive for pyroluria, her pediatrician had never even heard of it. Basically it sounds like it causes too much Kryptopyrrole in the blood which leads to a dramatic decrease in zinc and B-6. Some of the symptoms that I read were:
poor tolerance of physical and emotional stress, mood swings, depression, sensitivity to light, noise and other tactile sensitivities.
If interested you can ask your pediatrician to run a Kryptopyrrole test done via urine. Betsy's son's levels were indeed elevated.
I will keep everyone posted if I hear anything more on this and I plan on having boy's levels tested as well.
Some interesting reads:
http://kryptopyrrole.com/
http://www.nutritional-healing.com.au/content/articles-content.php?heading=Pyroluria
Thank you again Betsy for sharing this information!!!