Stress is a phsyiological response...
When under chronic stress, the body releases chemicals that keep your metabolism in high gear and your brain in "fight or flight" mode. This in turn, affects your sleep, mood, appetite (sugar cravings), causes fatigue, increases overall body inflammation and muscle tension.
Neurofitness UK work with people who need help with stress management
Training the brain to be more efficient, focused and regulated problems and issues will roll off you like water on a duck's back. You will gain more objectivity, inner calm and feel happier within yourself because your mood improves and anxiety and depression that so often accompany stress begin to decrease.