LEAN BODY BURN REVIEWS – DO LEAN BODY BURN PILLS REALLY WORK? Lean Body Burn comprises not just of muscles but also of essential organs, bone and bone marrow, connective tissue, and trunk food. Lean Body Burn = gross body weight minus lipid. The good operation of our bodies does not entirely depend upon lower fat content, but also on getting a higher proportion of Lean Body Burn, particularly in the older. As we identified earlier, the elderly absolutely want to keep their lean body mass for good life.