How stress becomes physical
For millions of years, humans were forced to protect themselves from environmental factors. From the earliest days of dinosaurs and cavemen, nature has proven its ability to put fear in human beings. Life and death circumstances have evolved around the ability to understand danger, and seek protection and survival. If you were being chased by a predator, your adrenal glands initiated a “fight or flight” response, releasing adrenaline and cortisol into the body. These hormones provided extra physical energy and strength from stored carbohydrates and fats.
While most of our stressors are not the same a our earliest ancestors, the body’s natural course of evolution has maintained this original fight-or-flight stress response. But whether we are being physically threatened or not, with any increased stress our body looks to its stored fuel, and then replenishes it when used. Also, with increased levels of cortisol, our body also does not respond as well to leptin, the hormone that makes us feel full, so we eat more.
Modern-day stress may be more psychological than physiological, but it is also more constant. Many of us face chronic stress as a way of life, which means we have consistently elevated levels of cortisol. Now the body thinks it continually needs extra fuel, and typically stores that as fat around the abdomen, or as it’s commonly referred to, the old “spare tire.”