Elaine
I believe the disease caused by too little sun and lack of Vitamin D is Rickets- Too much sun CAN cause cancer- I have fair skin and blue eyes and was badly sun-burned as a teen. Recently I had two cancerous lesions taken off my face- caused by the bad sun burn years ago. However, there is a happy medium. I limit my stay in the sun to 20 minutes. Vitamin D should only be prescribed by a doctor- that is important. It sounds like your school is looking out for you.