Casein powder
While everyone's bodies may react to different protein powders in different ways, Best says that casein, in particular, is one that many people have difficulties with.
Casein is a type of protein that's found in milk and dairy products. Best notes that it's frequently used in protein powders due to its slow-digesting properties—which is why it's no surprise that it can also lead to digestive issues. The fact that your body breaks down this protein at a slow rate can put a strain on your digestive system.
"Some people may experience digestive discomfort, such as bloating, gas, or constipation, after consuming casein protein," Best warns.
You may be especially susceptible to digestive issues caused by casein protein powder if you struggle with a dairy sensitivity or gut lacks the enzymes necessary to digest the protein. This enzyme is called dipeptidyl peptidase IV, and while it's naturally produced in your intestines, Livestrong notes some people, such as those with celiac disease, have lower levels of it.
Overall, there are several reasons you may experience bloating and other digestive issues after consuming casein powder—but it's also possible that you won't run into any issues at all.
READ MORE: 4 Quick Ways To Reduce Bloating Fast, According To Experts
Other protein powders that may cause digestive issues
It's important to note that some people don't experience any digestive issues after consuming casein powder. Additionally, Best notes that there are several other types of protein powder on the market that may be more difficult for different people to digest.
"Whey protein, for example, is a common type of protein powder that is derived from milk and is generally considered easy to digest," she says. "On the other hand, some people may experience digestive issues with soy protein, which is derived from soybeans, or with protein powders that contain high amounts of added sugars or artificial sweeteners." Learn more about how artificial sweeteners can affect your body here.
The bottom line
Overall, it's important to pay attention to your own body's reaction in order to figure out what works for you. As Best notes, "Individual tolerance and sensitivity to different types of protein powders may vary, and what works well for one person may not work as well for another."
The best rule of thumb is to listen to your body. "If you experience digestive discomfort after consuming a particular type of protein powder, it may be best to switch to a different type or to speak with a healthcare professional for guidance," Best concludes.
READ MORE: Experts Agree: These ‘Healthy’ Foods Could Be To Blame For Your Frequent Bloating