Steak 'n Shake, the fast-food chain embracing Health and Human Services Secretary Robert F. Kennedy Jr.'s Make America Healthy Again (MAHA) movement, announced that it will launch a new "Protein Steakburger" next month.The restaurant chain unveiled the Protein Steakburger, along with a Double Steakburger Double Cheese, with both menu items set to launch Sept. 1."Real ingredients. Real food. The Protein Steakburger consists of two 100% grass-fed, grass-finished Steakburgers," the company wrote. "It's the perfect meal after a hard workout."The announcement comes amid Steak 'n Shake's broader pus...