then how because i am genuinely clueless
Celiac disease is an auto-immune disease, where your immune system has a response to gluten.
The effects are feeling bloated, having diarrhea, constipation, indigestion, flatulence, fatigue and stomach pains.
Gluten isn't the cause of any behavioural issues. It won't make you 'hyper' or moody, as you might get with sugar or caffeine.