Food intolerances occur when the digestive system has difficulty processing a specific ingredient, causing symptoms. Food allergies happen when the body has an abnormal immune response to certain foods. Common food intolerances include gluten and lactose. Symptoms vary but can include digestive issues. Treatment involves identifying trigger foods and alternatives through an elimination diet or medication for allergies. It is important for those with intolerances or allergies to carefully check ingredient labels on foods.