But the diarrhoea produced by this reaction may, in turn, cause lactase deficiency.

Researchers have identified a possible genetic link to primary lactase deficiency.

This type of lactase deficiency can occur at any age but is more common in infancy.

More complicated tests can distinguish the two, and these show that primary lactase deficiency is actually very rare.

Drinking milk makes the situation worse, because there is often a transient lactase deficiency (see p 202).

Some people inherit a gene from their parents that makes it likely they will develop primary lactase deficiency.

"For most people with lactase deficiency, it's a discomfort."

Lactase deficiency ranks as one of the most common types of food intolerance.

Doctors refer to this as secondary lactase deficiency.

Lactase deficiency can also have the following causes:

Food intolerance and lactase deficiency may also be confused with food allergies.

The cause of lactose intolerance is best explained by describing how a person develops lactase deficiency.

Lactase deficiency has a number of causes and is classified as one of three types:

The mechanism by which congenital lactase deficiency induces hypercalcemia is uncertain.

Most children who have lactase deficiency do not experience symptoms of lactose intolerance until late adolescence or adulthood.

These people are said to have "lactase deficiency" and are called "lactose intolerant."

Lactose intolerance is a consequence of lactase deficiency, which may be genetic or environmentally induced.

This is called lactase deficiency.

Not all people with lactase deficiency have digestive symptoms, but those who do may have lactose intolerance.

Primary lactase deficiency develops over time and begins after about age 2 when the body begins to produce less lactase.

Response of patients with irritable bowel syndrome and lactase deficiency using unfermented acidophilus milk.

Lactase deficiency: prevalence in osteoporosis.

Although lactose intolerance is viewed as a disorder, about 75% of all people around the globe have some degree of lactase deficiency.

Efficacy of addition of exogenous lactase to milk in adult lactase deficiency.

An intestinal biopsy can confirm lactase deficiency following discovery of elevated hydrogen in the hydrogen breath test.