Among the various allergies that affect humans, dairy allergies are one of the most common. It is found in over 98% of all allergy cases. No mammal other than human beings consumes milk after they grow out of childhood. Further, as a person grows, his ability to digest lactose reduces. Several children tend to be allergic towards cow’s milk while being able to consume mother’s milk without any problem Lactose is the enzyme that causes this allergy.