Gluten free diet is usually followed by people intolerant to gluten or have recently used this fad diet to lose weight. Intolerance to gluten, commonly known as celiac disease, but also discussed other names, such as gluten-sensitive enteropathy or celiac sprue, is a disease that affects somewhere between 0.5 and 1% of Americans, and the only treatment known for the patient to maintain a Gluten free diet and the rest of their lives.