There are many pros and cons of meal replacement shakes, here we’ll break them down: The pros of meal replacement shakes include that they don’t require any cooking, they’re quick, they’re an easy way to add more calories to your diet, they make it easy to manage your calorie intake and they could help you manage your weight. However the cons of meal replacements include that they can be low in essential nutrients, they’re not always vegan, they’re not a long-term solution, they can be expensive and they can contain preservatives or chemicals.