Expert Debunks "Unhealthy" Claims About Popular Protein Shakes

A recent viral claim labeling Fairlife Corepower protein shakes as the "most unhealthy bottled beverage in America" has been addressed by dietitian Abbey Sharp. In a video released on June 19, 2025, Sharp systematically debunked four key arguments presented against the product, aiming to clarify misinformation for consumers. Sharp first addressed concerns regarding hormones and antibiotics in the shakes. She stated that all milk undergoes stringent testing to be antibiotic-free, and bovine somatotropin (bST), a hormone sometimes mentioned, is inactivated in the human digestive tract, posing no biological activity in humans. Secondly, the dietitian tackled the claim that carrageenan, a thickening agent, is linked to gut inflammation. Sharp distinguished between food-grade carrageenan, used in products like Corepower, and degraded carrageenan, which has been associated with cancer in animal studies. She emphasized that the food-grade variant is safe, and any potential irritation from excess fiber, not specific to carrageenan, would be minimal in typical consumption. The video also addressed the impact of artificial sweeteners on the gut microbiome. While acknowledging some animal research suggests sweeteners like sucralose and saccharin may deplete certain gut bacteria at very high doses, Sharp noted these effects are not universal and are dependent on individual gut microbiomes. She concluded that the amounts found in an occasional protein shake are not concerning. Finally, Sharp clarified the term "natural flavors," explaining that while their components aren't fully disclosed on labels, they are free of the top nine allergens and are safe. She concluded by stating that Corepower shakes are a convenient source of high-quality protein, calcium, and vitamin D, and are a healthier alternative compared to sugar-sweetened beverages that lack protein or fiber to regulate blood sugar.