The AB Design can be used to quickly assess the effects of an experimental variable. Its main disadvantage its inability to distinguish the experimental effect from possible confounds that might occur coincident with the change of condition.
ceÂ·liÂ·ac disÂ·ease. A disease occurring in children and adults characterized by sensitivity to gluten, with chronic inflammation and atrophy of the mucosa of the upper small intestine; manifestations include diarrhea, malabsorption, steatorrhea, and nutritional and vitamin deficiencies.
Gluten intolerance symptoms: Some people with celiac disease may not have symptoms, but internally malabsorption and malnutrition can ruin health over many years. Both celiac disease and gluten intolerance can be made worse by emotional and physical stress including infection, surgery, pregnancy and childbirth.