In a piece in LiveStrong, medically reviewed by Dr. Claudia Thompson, it's reiterated that protein shakes are great for weight loss, muscle growth, and even just simple fitness goals, but drinking them every day might not be necessary. It's all about your requirements, related to how much exercise you're doing, and what you're eating. You'll likely get much of your protein from meat, dairy, fish and eggs. But it's worth noting soy, beans, legumes, and whole-grains are also great sources of protein. 

It's recommended you get about 0.8 grams of protein per kilo of body weight daily, according to Harvard Health. If you feel as though you're not getting enough, protein shakes can definitely help. However, according to a study published in the American Journal of Clinical Nutrition, most Americans are getting more than enough protein. Only bodybuilders, for example, might want the extra protein on a daily basis.