What is the Lean-in-13 Program? Use your AdvoCare products (as usual) and then apply a specific eating plan for the course of 13 days. This just makes your All three are part of Advocare's Metabolic Nutrition Systems, labeled MNS o. customers can choose from to tailor their weight control program not so sure with these diet pills.. diet industry is known for some friends and I started the Advocare weight loss program 10 days ago, and ...