The important thing about meal replacement shake for weight reduction is you can lose as much weight as you need. Unlike many eating methods that are for 21 days, 30 days, 90 days or whatever, you can replace maybe a couple meals a day for whatever length of time that it takes you to get to your right weight. You can hope to lose 1-2 lbs. a week for the specified duration of time. When you achieve your optimal weight, just stop the meal replacement shake and eat typical, healthy meals once more. Maintain your new weight by occasionally replacing a dinner for a shake.