Medically reviewed by Soma Mandal, MD A vitamin D test is a blood test that measures the level of vitamin D (calciferol) in ...

Celiac disease is a digestive and immune disorder that can keep the body from absorbing necessary nutrients. "Our conception and awareness of celiac disease has evolved over the past few decades, but ...

If you feel sick or uncomfortable after eating foods like bread or pasta, you're not alone. Millions of people struggle with ...