'When a tree falls it resounds with a thundering crash; and yet a whole forest grows in silence.'
― Jocelyn Murray
Unfortunately, mainly bad news makes the headlines on TV nowadays. Positive events rarely make the headlines. Therefore, watching and listening to news 24/7 is like listening and watching trees falling all the time. You do not get a chance to enjoy the beauty of the growing forest. You get to see everything falling apart. And it is bad for your health.
In response to stress, your brain region called the hypothalamus sends a signal that triggers the adrenal glands secrete glucocorticoids, aka cortisol, which are steroid hormones that produce a number of effects on your body. It mobilizes energy into the bloodstream from storage sites in your body, increasing cardiovascular function and delaying long-term processes in the body that are not essential during a crisis, such as immune system, feeding, digestion, and growth, in order to survive immediate threats.
Therefore, glucocorticoids help the body respond to stress and, in fact, are essential for survival. However, long-term cortisol secretion and excessive levels of cortisol in the blood--due to chronic stress created by being exposed to bad news on regular basis--result in significant physiological changes, such as weakened immune system, cells damage, reduction in calcium absorption, increased blood pressure, nervousness, fear, and sometimes even aggression.
Thus, excessive exposure to bad news has a toxic effect on your body. So, stop consuming news 24/7. Stay up-to-date as much as you need and want during the day but limit the consumption. It will make you not only healthier--it will make you happier.