The Light As a Driver for Metabolism In 2012 Dr Jack Kruse presented his TED Talk in Nashville on how he lost over 150lb using the leptin rx protocol and cold thermogenesis. As the idea of light being a driver for metabolism, that leptin was a circadian hormone and that the wrong light could make you fat was not mainstream back then The talk was controversial but there were other deeper aspects due to the $$ interest in leptin as an anti-obesity drug……