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.
The villi create a large surface that absorbs vitamins, sugars, and other nutrients as food passes through the small intestine. When a person who has celiac disease eats gluten, the villi flatten out and the intestinal lining becomes damaged. This decreases the area that can absorb nutrients.