If you're sensitive to casein proteins, you should avoid the use of whey protein because of the chance of cross-contamination during the manufacturing process. Whey and casein proteins are the main proteins found in milk that can trigger an allergic reaction. If you have a milk allergy, you may be allergic to one or both proteins. Although you may be exclusively allergic to casein proteins, the chances of casein byproducts being present in whey protein are likely. Talk with your doctor before using any milk-based supplement or product if you've been diagnosed with casein sensitivity.
Milk Allergy
Milk allergies mostly affect young children, but can develop in anyone at any age. A milk allergy is the result of a hypersensitivity to whey, casein or both proteins. During the allergic reactio,n the immune system identifies the proteins as invaders in the body and unleashes a chemical attack to fight them off. During this chemical reaction, the immune system releases immunoglobulin E antibodies, histamine and other chemicals that cause most milk allergy symptoms, according to the Mayo Clinic. A milk allergy can cause life-threatening symptoms in rare cases.
Whey Protein
There is a chance that whey protein products and supplements may contain traces of casein proteins. The risk of ingesting casein proteins is too great and should be avoided. If you have a casein sensitivity, talk with your doctor about using other protein supplements that are milk-free, such as soy protein powders. Read the label of all foods before consuming because they may contain casein proteins. Avoid all foods and beverages that contain milk. The FDA requires that all packaged foods place an allergy warning on the product if it contains milk.
Lactose Consideration
Milk allergies are commonly confused with lactose intolerance. Both conditions cause digestive complications after consuming dairy products. If you're lactose intolerant, your symptoms may be the result of lactose and not a casein allergy. Lactose intolerance is a condition where your small intestines do not produce enough lactase, the enzyme that breaks down lactose, the sugar found in milk. Common symptoms from lactose intolerance include gas, bloating and diarrhea, according to the National Digestive Diseases Information Clearinghouse.
Warning
If you choose to ingest whey protein products and you develop the following symptoms, call 911 immediately: chest pain; hives; facial, lip or tongue swelling; confusion; rapid heart rate; faint pulse; and a drop in blood pressure. These are signs of a severe allergic reaction that will require an injection of epinephrine.
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