Whey protein is mostly found in cheese, milk, certain dairy products and supplements. It is abundant in protein that encourages muscle gain and other nutritional value that assists in weight loss. Whey protein is also low in calories, fats and carbohydrates that are ideal for people vying for weight loss. However, whey protein can also trigger side effects to individuals using its products like whey protein shakes.

Generally, there are a number of whey protein shakes side effects identified today. These whey protein side effects range between simple loss of appetite to the most problematic issues of diarrhea and nerve damage. This is the reason why it is always most recommended to consult your doctor when using whey protein like the shake forms as a food alternative in your diet. For you will never learn as to what magnitude do these whey protein side effects can adversely influence your body and its functions.

Also, it is best to learn more concerning the whey protein side effects of shakes and related products before trying them. Here is a list of the common side effects that are known in some whey protein product brands.


Certain whey protein products such as whey protein shakes recipes are loaded with amino acids such as phenylalanine. Amino acids are identified to be associated with mood swings or abrupt changes. Indeed, the medical center in the University of Maryland states that amino acids can actually cause anxiety to children.
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Bloating and Gas

Bloating and gas in the stomach may be thought of just simple whey protein complications. However, they are still very inconvenient especially to those who are lactose intolerant.

Since whey protein products particularly the shakes have milk contents, using them as food replacements can cause difficulties to those who have less lactose tolerance. So as an alternative to using whey protein shakes for losing weight or similar products, it is most advised for them to choose other protein alternatives instead like soy, egg or hemp.


Due to the fact some whey protein products consist of high amounts of glutamine precursors that encourage the production of glutamine in the body, diarrhea is likely triggered especially to those that have low lactose tolerance. This diarrhea is probably the most bothersome adverse reactions of whey protein so it is a good idea to consult your doctor before you consume whey protein products.

Suppressed Appetite

Whey protein is normally used in dieting regimen as a supplement for developing muscles. Nevertheless, one of the whey protein side effects negatively influences ones food habit.  Relating to the findings of the “British Journal of Nutrition” in October 2010, whey protein is far more filling than the whole foods like egg, turkey and tuna and causes a suppressed appetite to individuals taking whey protein products. This appetite suppression can impede muscle building and development by discouraging calorie intake. Calorie intake is still essential to the body and without it; the muscle gaining tasks are hindered.


Some individuals actually find the intake of whey protein to cause them nausea. This is likely because of the lecithin ingredients of whey protein products. Lecithin is thought to aid in the remedy for high cholesterol levels and liver problems; but to those who have lactose intolerance, it can cause repeated nausea or even vomiting.


Whey protein shakes for weight loss and other derivative products contain soy lecithin, an ingredient usually used as an emulsifier. This content usually causes adverse reactions to people, particularly to those that are lactose intolerant. Samples of such reactions include the emergence of rashes or hives and also the swelling of the lips, tongue and face.

Nerve Damage

Most whey protein milk and shakes usually contain 90% of the daily allowable intake of vitamin B6 per serving. Thus it follows that multiple servings of whey protein might cause high consumption of the vitamin B6. Vitamin B6 is important for the body. It stimulates the metabolism of red blood cells and inhibits the proper performance of the immune system; but according to the National Institutes of health, an excessive intake of vitamin B6 may cause nerve damages to the limbs. Thus, if such detrimental whey protein side effects occur in your dieting, it is a must that you stop taking the supplements to change such effects.

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