Although a gluten-free diet is an important part of treating celiac disease, it is not designed for weight loss, nutrition experts say. Margaret Weiss of the Kogan Celiac Center in Livingston, N.J., says ingredients that often replace gluten tend to add fat and calories, and replacement foods may be lower in fiber. Those who do lose weight while eating gluten-free are often making generally healthy choices such as embracing lean proteins and produce. "You clean up your eating habits by taking away white flour, sugar, junk food and other things you should be limiting anyway," said dietitian Jennifer Neily.