This article provides an evidence-based review of whey protein’s safety and side effects. Eating a high-protein meal can raise the pressure inside the kidneys and cause them to filter more blood than usual (14, 15). Our website services, content, and products are for informational purposes only. Whey protein is also a complete source of protein, meaning it contains all the essential amino acids. During this process, some of the lactose and fat is removed to render a product that’s about 90-95 percent protein. The key difference between them is how they are processed (1). This becomes an issue because consumers are led to believe that whey is akin to a superfood, when in reality it could damage their liver over time. If you are lactose intolerant, try switching to a whey protein isolate powder. One case report implied that a 27-year old male could have suffered liver damage after taking whey protein supplements (23). However, an intolerance is caused by an enzyme deficiency and does not involve the immune system (10). However, constipation is more likely caused when people eat fewer fruits and vegetables in favour of Whey Protein, especially when they’re on a low-carb diet. In some cases, a cow’s milk allergy may trigger anaphylaxis, a severe, life-threatening allergic reaction. What is a “Pain Cave” and How Do You Power Through It in a Workout or Race? Studies show that a high-protein diet in those with kidney disease may further damage the kidneys (19, 20). *This article is reprinted with permission from Switch4Good. Even powdered protein supplements often contain milk powder or other derivatives. If you have liver disease, check with your doctor before taking whey protein. People who are lactose intolerant don’t produce enough of the enzyme lactase, which your body needs to digest lactose (5). Allergy: If a person is lactose intolerant, then it is recommended that the person should not consume whey protein.Although it contains only about 8% to 10% lactose, it might still trigger allergies in certain people. Whey protein can be found in meal replacement shakes and other diet-related food products that promise weight loss or increased muscle mass through food alone. Benefits. Whey protein is a popular choice among athletes, fitness enthusiasts and people wanting to build muscle or lose weight. However, it may cause digestive symptoms in those with lactose intolerance, and those allergic to cow’s milk may be allergic to it. Poses a Potential Threat to the Immune System for Those with Dairy Allergy. Another reason why replacing whole foods with whey protein is a bad idea is because it may increase your risk of nutrient deficiencies. Whey is a safe source of protein. You can reduce your muscle mass by doing the opposite of what you would do to increase muscle mass: Consume fewer calories, use lighter weights and…. Do this before and after the workout, and take into consideration any whey-based bars or other dairy they consume throughout the day, and they’ve far exceeded the normal amount. Despite its health benefits, some people are concerned about its safety. Some people have problems digesting whey protein and experience symptoms such as … Whey Protein Dangers to Your Health. While whey protein is considered safe for healthy adults, the purity and safety of any supplement is not regulated by the FDA, and consumers use at their own risk. To make whey-based protein supplements, the liquid whey is processed into a powder form. In turn, the body would release more calcium from bones to act as a buffer and neutralize the acidic effects (31). 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