Protein shakes are becoming increasingly popular in the U.S., even though most Americans already meet or exceed their daily protein needs. According to data from market research firm Statista, protein supplement sales rose by 9% in 2024, signaling a growing interest in this essential macronutrient—particularly among fitness enthusiasts and busy consumers looking for convenience.
While whole foods remain the nutritional gold standard, many people are turning to protein shakes as a quick and easy option. “If you’re concerned you’re not getting enough protein, shakes offer a simple, convenient way to get more,” says Amy Bragagnini, a registered dietitian and spokesperson for the Academy of Nutrition and Dietetics.
Protein shakes are especially popular post-workout, when the body is more receptive to protein intake. The National Academy of Sports Medicine notes that consuming protein shortly after exercise can aid in muscle repair and growth, and liquid shakes are a hydrating, digestible option during that critical recovery window.
In certain situations, shakes can be especially beneficial. For people undergoing intense medical treatments such as chemotherapy, or for those who are undernourished, protein shakes can provide an easy source of calories and nutrients to support weight gain and recovery, says Dr. Shannon Dowler of the American Academy of Family Physicians.
However, experts caution that protein shakes should not replace whole meals or a balanced diet. “I want to make sure people aren’t adding a protein shake to completely eliminate whole foods or meals,” Bragagnini says. Whole foods like Greek yogurt, flax seeds, or peanut butter offer additional nutrients and fiber that processed powders often lack.
There are also concerns about quality and transparency. Protein powders are classified as dietary supplements and are not regulated as strictly by the U.S. Food and Drug Administration. This means the contents may not always match what’s advertised on the label. Bottled shakes may also contain high levels of sugar, artificial sweeteners, or sugar alcohols, which can cause bloating, headaches, and other digestive discomforts.
Excessive protein intake poses risks as well. “You can actually damage your kidneys with too much protein if you have kidney challenges,” Dowler warns. Other possible side effects include constipation, bad breath, and dehydration, according to the Mayo Clinic.
To determine if you’re getting enough—or too much—protein, experts recommend tracking your intake. The American Heart Association advises a daily intake of 0.8 grams of protein per kilogram of body weight, though more active individuals may need more. Consulting a healthcare provider or registered dietitian can help tailor protein goals to your body type, activity level, and overall health needs.
In the end, while protein shakes can be a helpful supplement, experts agree they are best used in moderation—and not as a replacement for real, whole food.
