Why is gluten bad for weight loss
For centuries, gluten-free foods have provided people with protein, soluble fiber, and nutrients. 
Gluten, especially gluten found in whole grains, is not bad for healthy people whose bodies can tolerate it.
It's common in bread, pasta, pizza, and cereal. Gluten provides no essential nutrients, and people with celiac disease have an immune reaction triggered by eating gluten.
But if you eat a gluten-free diet, you may make healthier food choices because you're more aware of how to read food labels.