The protein shakes that health supplement stores sell, which people sometimes buy as a dietary aid to build muscle mass, may not actually be safe for health in the long run according to a new study in mice.
Many fitness protein powders that are commercially available consist primarily of whey proteins, which contain high levels of branched-chain amino acids (BCAAs).
Statistical reports show that in 2017 alone, the global whey protein market had a financial value of about $9.4 billion, with estimates suggesting that this may rise to around $14.5 billion by 2023.
BCAAs, which are three essential amino acids called leucine, valine, and isoleucine, are meant to help increase muscle mass in people who are interested in bodybuilding, though some scientists believe this claim to be “unwarranted.”
Now, research in mice goes even further, suggesting that a diet that is high in BCCA-containing protein but relatively low in other essential nutrients can have many negative effects on long-term health and lifespan.