Some individuals have an inability to digest specific types of carbohydrates due to a lack of one or more intestinal enzymes. This carb intolerance is a type of malabsorption syndrome sometimes referred to as Carbohydrate Intolerance Disorder (CID). It can be congenital (fairly rare), acquired, or secondary to conditions that damage the small-intestine (e.g., celiac disease, tropical sprue, acute intestinal infections a child, symptoms may include diarrhea and failure to gain weight appropriately. In an adult, symptoms may include watery diarrhea, abdominal cramps and bloating, excessive flatus or gas, and nausea, borborygmi or stomach rumbling. No surprise, this malabsorption is often readily controlled by avoiding dietary sugars that cannot be absorbed; for example, by following a lactose-free diet in cases of lactase deficiency.