why pessimism shuts down your immune system

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Pessimism leads to depression, whether it is mild or deep. And when a person is depressed, certain brain hormones become depleted, creating a chain of biochemical events that end up slowing down the activity of the immune system. For example, two key players in our immune systems are T cells and NK cells.

T CELLS recognize invaders (like viruses) and make more copies of themselves to kill off the invaders. Pessimists’ T cells don’t multiply as quickly as optimists’, allowing invaders to get the upper hand.

NK CELLS circulate in the blood and kill whatever they come across that they identify as foreign (like cancer cells). Pessimists’ NK cells can identify foreign entities, but they don’t destroy them as well as the optimists’ NK cells.

Read more: Optimism Is Healthy and Optimism Interview

Author: Adam Khan
author of the books, Self-Help Stuff That Works and Antivirus For Your Mind
and creator of the blog:
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