Question: how do you know you should not eat gluten?
Answer: Bloating. Bloating is when you feel as if your belly is swollen or full of gas after you've eaten. ... 
Diarrhea, Constipation and Smelly Feces. ... 
Abdominal Pain. ... 
Headaches. ... 
Feeling Tired. ... 
Skin Problems. ... 
Depression. ... 
Unexplained Weight Loss.