The person may lead to certain diseases that can shorten the lifespan. These diseases known as non-communicable diseases (NCDs) are not transmitted from a person to person, yet kill more than 36 million people each year. Also called chronic diseases, they are long of duration and are generally of sow progression. The four main types of NCDs are cardiovascular diseases , cancer, chronic respiratory diseases, and diabetes.
A person brimming with negativity will have a superhuman power to see that world behind the fake curtains of optimism. A pessimistic person will able to see things that a positive person will never see. For instance, a optimistic person may witness a group of friends having a laugh together. A highly trained pessimist will see a group of sociopaths bullying a manchild.