Gluten-containing Foods
Some people suffer from a condition known as gluten intolerance [2] or Celiac disease, and so their immune system reacts by attacking their gut anytime they consume foods that contain gluten. These people tend to experience severe constipation when they take foods that contain gluten.
Gluten is found in foods like wheat, barley, spelt, triticale, kamut, rye, etc. People with this condition must adhere strictly to a gluten-free diet.
Dairy Products
Milk and other dairy products like cheese are a cause of constipation in some people. This has been observed in some children. Milk can always be replaced with soymilk and dairy products should be taken in small quantity if it causes constipation for you.