Meal replacements can be used in place of regular food to help an individual achieve their nutritional goals ideally under the guidance of a qualified professional. This can be determined based on an individual’s resting metabolic rate (RMR) which is measured by a high-tech, body composition analysis scale that calculates an individual’s resting metabolic rate. The resting metabolic rate is the number of calories burned in a 24-hour period of time. The body burns calories digesting foods, breathing, the heart pumping and during other vital functions the body performs to sustain life. If the person is desiring weight loss, weight gain or weight maintenance, it is determined most accurately by their RMR. Medical grade meal replacements also maintain muscle mass, particularly while losing weight since they provide adequate protein intake. The importance of sufficient protein intake and few carbohydrate intake is so the muscle will be spared from being used for energy and forced to burn fat for energy. Sufficient protein also produces satiety or satisfaction of fullness as protein is the most satiating macronutrient among carbohydrates, proteins, and fats. Finally, meal replacements often supply a well-balanced meal with adequate protein, sufficient but minimal carbohydrates, healthy fats and most likely the daily requirements of vitamins and minerals. Meal replacements are often a means to an end but can be used safely in any meal plan for any length of time and are often a convenient and easy way to ensure adequate nutrition when losing weight.