No calorie counting, no special foods to buy -- just pop open a can and nutrition goes in and weight comes off. Are meal replacement shakes (MRS) really that simple and effective? And are they healthy? What are the pros and cons of using them? Do people really lose weight, and, if so, do they keep it off? This article will provide some answers to these questions. Meal replacement shakes are available at grocery, drug and health food stores. They contain approximately 200 calories per serving and ...