The ideal frequency of protein shakes depends on your fitness goals, diet, and lifestyle, but most people benefit from 1–2 shakes per day as a supplement to whole food, not a replacement. A typical approach is to have one shake post-workout to aid muscle recovery, or one with breakfast if you're short on time. Some athletes doing heavy training may have two—perhaps one after a workout and another as a meal replacement—but this should still be paired with whole foods like chicken, fish, eggs, and legumes. Consuming more than two per day is unnecessary for most people and can make it harder to eat nutrient-dense whole foods that provide fiber, micronutrients, and satiety that shakes don't fully replicate. Individual needs vary: someone doing light exercise might prefer none, while someone with high protein requirements (like competitive athletes) might have two regularly. Quality matters too—whole foods should form the foundation of your diet, with shakes as a convenient addition. If you have specific fitness goals, a healthcare provider or nutritionist can recommend a personalized frequency based on your training intensity, body composition goals, and current diet.