What Is Lactose Intolerance?
Lactose intolerance is a condition in which the body does not produce enough of the enzyme lactase to break down the sugars in dairy products (lactose). Lactose intolerance is more common among Asian, Native American, and black people.
Lactose intolerance is not the same as a food allergy, in which the body’s immune system reacts to the protein in dairy products, rather than the sugars.
What Causes Lactose Intolerance?
Lactose intolerance is caused by an inability of the body to absorb lactose, the naturally occurring sugar in dairy products. The small intestine produces low levels of the enzyme lactase which breaks down lactose, so people without it are unable to digest all the lactose they consume.
The causes of an inability to produce adequate lactase include
- Certain genetic conditions
- Lactase nonpersistence (also called primary lactase deficiency), the most common cause of low lactase levels
- Congenital lactase deficiency, starts at birth (rare)
- Injury to the small intestine (secondary lactose intolerance)
- Infections, diseases, or other conditions that injure the small intestine
- Crohn’s disease
- Celiac disease
- Certain treatments
- Premature birth
How Is Lactose Intolerance Diagnosed?
There are two ways doctor’s test for lactose intolerance.
- Lactose hydrogen breath test
- Patients drink a liquid with lactose in it and then breathe into a special machine every 30 minutes.
- The machine measures how much hydrogen is exhaled.
- People with lactose intolerance breathe out more hydrogen than normal.
- Lactose tolerance test
What Are the Side Effects of Lactose Intolerance Pills?
Treatment for lactose intolerance includes:
- Limiting or avoiding dairy products
- Supplementing nutrients such as calcium, vitamin D, and protein with non-dairy sources
- Taking an enzyme supplement to help break down the lactose in dairy foods
- Lactaid (tablets or liquid), Lactrase, LactAce, Dairy Ease, and Lactrol
- Take enzyme supplements right before eating
- It can be taken during a meal, but it might not work as well
- These products can’t always break down all the lactose so some people may still have symptoms even if they take a supplement
- Most people do not have side effects from lactose intolerance pills
- Talk to your doctor before using enzyme supplements, as they may not be recommended for some people, such as children and pregnant or breastfeeding women
What Are Complications of Lactose Intolerance?
Complications of lactose intolerance include:
- Nutrient deficiencies such as calcium or vitamin D, in patients who avoid dairy and do not get these nutrients in other foods
- Osteoporosis from low levels of calcium