Sorry to chime in when I'm not on IP yet, but another reason that most of the meal-replacement programs (From SlimFast to IP and all the others in-between) include a "real meal" is because a real food meal makes the plan safer.
The early meal-replacement diets included no "real" food just shakes, bars, soups, and/or puddings), and several were pulled from the market and liquid diets got a bad reputation overall, because of deaths and injuries resulting from the diets (usually heart damage related).
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