* Food intolerance reactions may vary the severity of the associated symptoms and the length of time for which they persist. * For example peanut allergy is often life long and can cause severe, even life threatening reactions to tiny amounts of peanut protein. * Cow’s milk intolerance may be severe in early life, but typically disappears as the child grows older. * Similarly, egg intolerance is usually a temporary phenomenon associated with early childhood. * Coeliac disease (gluten sensitivity) is normally life long and requires adherence to a diet that excludes all gluten. But in some people as the disease is mild and goes undiagnosed, the individual is not aware of any symptoms. Lactose intolerance occurs in individuals who lack or have low levels of the enzyme lactase, which is needed to digest the sugar lactose (found in milk) to its constituent sugars (glucose and galactose) for absorption in the small intestines. It is a condition seen in older children and