27 diseases linked to vitamin D deficiencies, and counting.
http://www.health.com/mind-body/vitamin-d-health-risks
Obesity
Diabetes
Insulin resistance
Heart disease
Lupus
Preterm birth
Multiple Sclerosis
PMS
Inflammatory bowel disease
Alopecia and hair loss
Eczema
Tooth decay in infants and toddlers
Gum disease and tooth loss
Alzheimer's and dementia
Schizophrenia
Depression
Urinary Tract infections
Female incontinence
Asthma
Colorectal cancer
Breast cancer
Pancreatic cancer
Prostate cancer
Osteoporosis
Rickets
Erectile dysfunction
Childhood language impairmant