The source of most illness is stress
If you often feel tired, no matter how much sleep you get or how much caffeine you drink, if you experience tight muscles, mental fatigue, anxiety, or racing thoughts, stress might be the cause.
When the body is stressed, it secretes a hormone called cortisol into the bloodstream. This hormone excites the nervous system, shifting the whole body into a state of readiness and alertness. This is known as our stress response or the fight-or-flight response.
While this response is important and necessary for getting through everyday life, our bodies were not created to spend the majority of its time in this state. With time, our nervous system biases towards this heightened state, sensitizing the body to otherwise normal stimuli and making it difficult for the body to rest and recover properly. This raises the body’s overall energy consumption and feelings of fatigue and tiredness. Moreover, chronically elevated levels of stress may lead to increased blood pressure, hyperventilation, anxiety, and adrenal fatigue.
Elevated levels of stress and cortisol have also been linked to weight gain and obesity. Cortisol interferes with the body’s hunger hormones and can cause increased appetite and fat cell production.