In the US, milk allergies are the most common allergies among children, estimating that between 2 and 3% of children under the age of 3 are allergic to milk, according to the American College of Allergy, Asthma & Immunology.1 While most outgrow their allergy by age 4, some may not, and it may have an impact on their bone health. A study released in 2016 found that 6% of children with an allergy to cow's milk had a lower bone mineral density in their lumbar spine than those that consumed milk. Calcium intake was significantly lower in those with a milk allergy and few subjects supplemented their diet with calcium and vitamin D, two important nutrients for children obtained from milk.2
What is a milk allergy?
Not to be confused with lactose intolerance, the inability for the enzyme lactase to break down sufficient lactose into monosaccharides, a milk allergy is an immunological hypersensitivity to the proteins, whey and casein, in milk. This can elicit a mild to severe adverse reaction when even the slightest bit of food is ingested, including life-threatening anaphylactic shock.3
Bone Health in Adolescence
The youth years are an extremely important time for bone development. In adolescents, growing bone is in the modeling stage, sculpted through the construction of new bone and removal of older bone. Calcium, being the most abundant mineral in the human body, is the key mineral during this process and mainly stored in the bones and teeth. Consuming adequate calcium in adolescence is crucial for bone growth and for long-term bone health in adult years. A calcium deficiency in children can lead to improper bone development among other bone health issues later in life.4