2. Unexplained Weight Loss
Losing weight from undiagnosed gluten intolerance can stem from a couple of factors. One is that discomfort upon eating means you simply eat less. Belly pain can make it very difficult to go about your day.
The other is that gluten intolerance is a factor in poor nutrient absorption, so even when you do eat, your cells are not getting the fuel they need, leading them to burn fat instead.