You will also receive emails from Mayo Clinic on the latest health news, research, and care. Lactose intolerance occurs when your small intestine doesn't produce enough of an enzyme lactase to digest milk sugar lactose.
Normally, lactase turns milk sugar into two simple sugars — glucose and galactose — which are absorbed into the bloodstream through the intestinal lining. If you're lactase deficient, lactose in your food moves into the colon instead of being processed and absorbed.
In the colon, normal bacteria interact with undigested lactose, causing the signs and symptoms of lactose intolerance. There are three types of lactose intolerance. Different factors cause the lactase deficiency underlying each type.
People who develop primary lactose intolerance — the most common type — start life producing enough lactase. Infants, who get all their nutrition from milk, need lactase. As children replace milk with other foods, the amount of lactase they produce normally drops, but usually remains high enough to digest the amount of dairy in a typical adult diet.
In primary lactose intolerance, lactase production falls off sharply by adulthood, making milk products difficult to digest. This form of lactose intolerance occurs when your small intestine decreases lactase production after an illness, injury or surgery involving your small intestine.
Diseases associated with secondary lactose intolerance include intestinal infection, celiac disease, bacterial overgrowth and Crohn's disease. Treatment of the underlying disorder might restore lactase levels and improve signs and symptoms, though it can take time. It's possible, but rare, for babies to be born with lactose intolerance caused by a lack of lactase.
A Dairy Intolerance is considered more of a sensitivity to the proteins found in dairy products. This may cause symptoms to occur immediately few minutes , or the symptoms can occur a few hours and up to a few days later, this is called a delayed reaction. Dairy protein intolerance produces a non-IgE antibody and is not detected by allergy blood tests. The symptoms can vary and will affect the respiratory, gastrointestinal and dermatological systems, these can be bloating, nausea, constipation, diarrhea, indigestion, constant runny nose, blocked nose, constant cough, recurrent sinus infections and chest infections, skin conditions such as eczema, hives or acne, headaches and tiredness.
Sufferers may only have one or several of these symptoms. To test a dairy intolerance it is best to eliminate for at least 2 weeks then you can reintroduce dairy and observe any symptoms that you may have suspected are caused from dairy.
It is best to keep a diet diary to determine any reactions. A Reboot is an excellent time to avoid any possible suspected food allergens including dairy products.
You can use this time to observe any health changes or improvements; I highly recommend keeping a journal of any symptoms before, during and after a Reboot. A blood test looks for elevated blood glucose levels after the patient consumes a standard amount of lactose. Secondary lactose intolerance may go away after the intestinal tract heals and begins to function normally again, which could take weeks or months. Managing this intolerance is usually a matter of making diet changes, but some medications may be helpful.
Many doctors agree that the best way to treat an intolerance is to avoid consuming lactose to begin with. Lactose is in dairy products and non-dairy products, so reading food and medication labels is important.
Barry Sears, Ph. Sears recommends lactose-free milk products as a source of high-quality protein. Health food stores will typically carry these types of foods, and regular grocery stores are starting to stock up on things like lactose-free milk as consumer demands go up. Substitutes have become quite trendy. In the milk aisle, you might find soy, rice, almond, coconut, macadamia, and oat milk alternatives. Fatty fishes, eggs, mushrooms, green leafy vegetables, and nuts are all great sources of calcium and vitamin D.
Some medicines help the digestive system process lactose. Over-the-counter drops and tablets that contain the lactase can help with digestion. Adding drops of lactase to milk before drinking it, or taking a tablet before eating dairy products can make a big difference.
Check the label on foods you eat and see if you feel ill after eating them. Those with lactose intolerance often feel the unpleasant symptoms a few hours after consuming lactose.
If you consistently feel ill shortly after eating dairy, you could have lactose intolerance. Embarrassing and uncomfortable symptoms include painful gas and bloating.
Try a vegan challenge and remove lactose from your diet completely for several weeks. If you notice that your stomach problems subside and that you feel better, you have a sign that the dairy products are probably causing your pain. To confirm your lactose intolerant diagnosis, there are several tests you can perform. One is the hydrogen breath test measures the amount of hydrogen in your breath after you drink a lactose-loaded beverage several times during a few hours.
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