8 Nutritionist-Approved Ways to Add Protein to a Smoothie (Without Those Expensive Powders)

Greek yogurt

You might already use yogurt as a base, but upgrading to a thicker Greek-style version will make your smoothie a protein powerhouse. One six-ounce cup of plain Greek yogurt packs in a whopping 18 grams of protein. Flavored versions can be surprisingly high in sugar, so stick with plain, says registered dietitian nutritionist and culinary specialist Sara Haas, RDN, LDN, spokesperson for the American Academy of Nutrition and Dietetics. “You can control the sugar,” she says. “If you want something a little sweeter, add a little honey or fruit.”