Untreated celiac disease damages the digestive tract. This affects the body's ability to absorb critical nutrients from food that help it function normally and recover from injury or infection. Over time, this can lead to malnutrition and weight loss and can also stunt children's growth and delay their development. While non-celiac gluten intolerance does not directly damage the digestive tract, its IBS-like symptoms (like chronic diarrhea) can have similar effects in severe cases. Treatment for weight loss caused by malnutrition requires the guidance of a medical professional and includes dietary supplements and increasing daily caloric intake.

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