Protein-heavy Rock smoothie may not suit everyone after workout

A South Carolina dietitian says the massive protein smoothie Dwayne "The Rock" Johnson showcased on social media isn't a one-size-fits-all recipe. Lauren Manaker, a registered dietitian based in Charleston, reviewed the actor and former professional wrestler's post-workout drink for Fox News Digital, noting that its unusual components suit his size and training demands. Johnson posted the recipe on Instagram on Oct. 5. It calls for 70 grams of protein powder along with an ingredient most people wouldn't expect in a smoothie.

Protein Content Remains Uncertain

Exactly how much protein that 70-gram serving delivers is unknown. The powder is a prototype Johnson is testing as research for a supplement line he hopes to release in the coming years. Even so, Manaker told Fox News Digital it's safe to assume the protein content is high. The drink also packs 10–15 grams of creatine. Manaker noted that this dose is reasonable for someone of Johnson's stature and weight — 236 pounds, according to his Instagram post — but it might be a bit high for someone who weighs less or is at a different fitness level. According to the Mayo Clinic, creatine is a compound derived from amino acids, which are the building blocks of protein. The body produces creatine naturally, and most of it is stored in muscles, but physically active people may take creatine supplements to help with muscle growth or recovery after a workout.

Rice Fills the Carb Slot

Jasmine rice, which might not seem like a typical smoothie addition, is most likely included to fill the carbohydrate portion of the smoothie's macronutrient, or "macro," composition, Manaker said. Johnson eats about 4,000 calories per day, according to the post's caption.