Health contains seven chapters which present methods to find the Healthy Life Years Lost and the gender differences in the risk of depression. The “Direct” Healthy Life Years Lost (HLYL) methodology (Skiadas & Skiadas, 2018a, 2018b, 2020a, 2020b, 2020c) was based on averaging the Health State of a Population by taking into account the deaths/population from the mortality qx and the alive part of the population. A geometric approach of the methodology is presented where both mortality and survival are presented as corresponding areas.