You are confusing overweight with having a healthy amount of subcutaneous fat. The ripped gym bro that many regard as optimal is someone in severe stress that works hard to maintain muscle. If you have good general health with proper SC fat you maintain large and strong muscles doing very little. Posture is of great importance to achieve this, and hard gym exercise is a good way to harm posture if you are not conscious of doing it correctly.Expecting scarcity is expecting stress, which is a stressor already in itself. A healthy body does not pack fat in preparation for hardship. A healthy person has no need for fat storage, because the optimally efficient metabolism of a healthy person does not need much food to begin with. Only a sick person needs a lot of food! Thus only a sick person will easily put on weight -- the healthy person will simply increase their metabolic rate. Furthermore, a fat person will not be able to elevate their CO2 tolerance beyond a certain point until they reach normal body weight. The conclusion is that carrying excess fat offers no health benefits and is innately stressful.