13 Side Effects of Whey Protein

Side Effects of Whey Protein

There are many different types of whey protein supplements on the market today. They come in a variety of flavors, and can be taken any time of day. Whey protein is considered to be one of the best sources for building muscle, but it also has some side effects that you should know about before taking a supplement. In this blog post, we will discuss 13 side effects that have been observed by scientists when studying whey protein!

Whey protein can cause bloating, gas, and stomach pain. This is because the body treats it as a foreign substance that should be rejected. The most common side effect of whey is to become constipated or even have diarrhea from consuming the supplement too often.


Bloating: After taking in proteins such as by eating meat, soybeans, salmon or other high quality protein source you are likely going to experience bloating. This is because the body perceives these proteins as a foreign substance and they need to be digested before your system can process them fully.


Constipation: The most common side effect of whey protein are constipation or diarrhea from consuming it too often, especially if you have an already sensitive stomach and don’t take in enough water while taking this supplement. Too much protein intake may lead to dehydration which will make your symptoms worse!


Fatigue: If you start including more fats, carbohydrates and water into your diet then fatigue should not happen at all but some people notice feeling fatigued after taking Whey Protein due to cutting out carbs or fat sources without replacing them with nutritious foods like vegetables! Don’t forget you need to drink more water!


Itchy skin: Whey Protein contains no sugar at all so any fatigue may be due to cutting out carbs or fat sources without replacing them with more nutritious foods like vegetables but don’t forget you need water for proper hydration. You may start noticing itchiness on your skin after taking whey protein supplements. This can be due to the body treating it as a foreign substance that should be rejected, or because of not enough water intake while the supplement is being consumed.


Difficulty sleeping: Consuming Whey Protein may cause difficulty with sleep and headaches but this side effect will occur only if you are consuming too much! Be sure to limit how often you take in these high-calorie food sources so that they do not lead to any other negative symptoms for your health.


Lactose intolerance: If Lactose triggers stomach pain, diarrhea or nausea then make note of this reaction before continuing consumption and consult with a doctor about cutting out all dairy products until the symptoms clear up! Whey Protein contains the natural milk sugar Lactose found in many dairy products such as cheese or ice cream. If this causes you to suffer from stomach pain, nausea and diarrhea then it may not be safe for your body anymore so take caution when consuming anything with high levels of Lactose!


Weight gain: While taking whey protein supplements there are higher risks for weight gain due to its increased calorie content but if you substitute these calories by eating more vegetables and whole grains while staying hydrated then fat intake will still stay low. It’s also important that a person who is trying to lose pounds does exercise on top of their supplement usage because getting rid of all extra fats can create other problems like not being able to produce enough testosterone which can lead to low libido.


Kidney problems: There are no reports of studies on the long term effects of whey protein and kidney problems. There is a possibility that when taking it in high doses over an extended period of time, there could be some damage to your kidneys but this has not been proven yet!


Decrease libido: High amounts of fats without enough exercise will lead to low testosterone levels which affects sex drive as well as many other male functions such as growing muscle mass.


Liver problems: Again, There are no studies on the long term effects of whey protein and liver problems. Whey Protein is often used for bodybuilders to help build muscle mass but it has not been proven that any damage would occur from this supplement which could lead to kidney or liver problems.


Diarrhea: Taking in too much whey protein will give you diarrhea. Drinking enough water will help with this symptom and make sure not to overdo it on the whey or your body may reject it!


Nausea: Taking in too much whey protein can cause nausea but if you drink more water then symptoms should diminish within a day. Be aware of how much whey protein is safe for you and don’t go over that amount to avoid any other unwanted symptoms.


Vomiting: If you take in too much whey protein then you may start vomiting so if this happens drink water or fluids and try some crackers as well!


Gas: If you experience gas or bloating then try cutting back on your whey protein intake and drinking more water.


Thirst: Whey Protein is not a sugar so it will cause thirst because of the lack of carbohydrates in this supplement but if you drink enough fluids to compensate for that then all should be well!


Nutritional imbalance: Whey Protein is not a replacement for whole foods so be sure to take in your vitamins and minerals from other healthy sources as well!


Joint pain: Whey protein supplements are high in phosphorus which can lead to joint pains. This usually won’t cause any severe damage but it may be uncomfortable so exercising will help with this symptom!



  • Be cautious with using whey protein if you suffer from lactose intolerance, weight gain and kidney problems.
  • Drink more fluids when taking in high amounts of whey protein to avoid any other side effects like vomiting or diarrhea!
  • Take care of your body by exercising on top of supplementing with whey protein so that you can lose weight and have a healthy libido.
  • Whey protein is not enough, don’t substitute this supplement for whole foods in your diet!
  • Generally speaking, whey protein has many benefits but it also comes with some side effects which are explained above. Be careful when consuming anything high in lactose or fats because your body may reject it and you will experience many unpleasant symptoms! If all is well then enjoy your whey protein supplement but do not rely on this as a replacement for whole foods in your diet. Whey protein can help with weight loss, muscle building or any other specific goal so don’t let the side effects stop you from enjoying what it has to offer.