Why use meal replacements? Meal replacement drinks are convenient, inexpensive meals that aid in weight loss or weight management. They are one of the most underestimated tools in a dieter's toolbox. Meal replacements provide you with a convenient meal that is high in protein, low in fat, low in carbohydrates, with 20-30% of your daily value of vitamins and minerals. You're able to a get high protein, vitamin rich, moderate-carb meal for less calories then your typical meal.