 [ Symptoms ] can food allergies cause weight gain  several people have told me this  that their seasonal allergies cause weight gain one other says that her celiac disease causes weight gain  celiac disease usually causes failure to thrive in infants  could it cause weight gain in either children or adults  thank you  sheila wall@gmail com [ Disease ] excessive calorie intake and lack of calorie burning are the main causes of weight gain allergies per se does not cause weight gain but changes in food quality switching from a food that is suspected of causing allergy to one of higher calories and amounts of food can be a subtle cause if the person is not aware they are actually eating more calories failure to thrive in infants is a lack of weight gain and would not be comparable