"Last week, Starbucks jumped on the protein bandwagon and started offering protein-boosted milk as an option for your lattes. Tick this on the app or tell the barista, and you'll get an extra 27 to 36 grams of protein in your drink and your diet. Sounds great, right? Well, here's the thing: as people started ordering these protein-pumped drinks, they ran into a pretty gross problem: the foam started curdling so badly that it actually became a solid chunk on top of the drink."
"People have been bringing their drinks home only to discover a " protein float" on top of their coffee with a texture that looks unsettlingly like mashed potatoes. In some particularly nasty cases, like one viral TikTok, the protein foam congealed so much that the person had to literally spoon out their drink one scoop at a time. One Redditor (who was one of the earliest to flag the problem) shared to Starbucks' subreddit a photo of their thickened protein latte and described theirs as having the consistency of oatmeal."
High-protein milk added to hot Starbucks beverages is separating and clumping, producing a thick, congealed foam layer that many users compare to mashed potatoes or oatmeal. The fortified option adds roughly 27 to 36 grams of protein, and when that protein meets heat the proteins denature, warp, separate and aggregate into visible lumps. The congealed foam can become so dense that sipping through a straw becomes impossible and customers sometimes spoon out the solidified top. Social media posts and photos document widespread instances of these curdled protein floats appearing primarily on hot lattes.
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