so what is this he is a semi-pro ice hockey player and trains an awful lot but this last 10 months he has had various colds,sore throats,tummy pains, we changed his diet to gluten free but it didnt make a difference. now the consultant thinks its a problem with his low white blood cells, and issues with his immuineaglobins. why cant someone explain all of this for me. a worried hockeymummy.