The varieties of language you use in different areas of your life are known as speaking or writing styles. Some particularly specialized styles, such as those used in the courtroom, or poetry, or the operating room, are known as registers.
The United States National Institutes of Health recommends testing vitamin A levels in people with celiac disease at diagnosis. This is because vitamin A deficiency is common in celiac disease. Deficiency can result from incomplete digestion, absorption, or metabolism. Normal absorption of vitamin A first requires digestion, or releasing, from food protein in the stomach.
These structures help absorb nutrients. 1  When people with celiac disease eat foods with gluten, their immune system reacts by damaging the villi.  Because of the damage, the villi are unable to properly absorb iron, vitamins, and other nutrients.