Complaining Rewires Your Brain for Negativity. Research shows that most people complain once a minute during a typical conversation. Complaining is tempting because it feels good, but like many other things that are enjoyable — such as smoking or eating a pound of bacon for breakfast — complaining isn’t good for you.
Your brain loves efficiency and doesn’t like to work any harder than it has to. When you repeat behaviour, such as complaining, your neurons branch out to each other to ease the flow of information. This makes it much easier to repeat that behaviour in the future — so easy, in fact, that you might not even realize you’re doing it.
You can’t blame your brain. Who’d want to build a temporary bridge every time you need to cross a river? It makes a lot more sense to construct a permanent bridge. So, your neurons grow closer together, and the connections between them become more permanent. Scientists like to describe this process as, “Neurons that fire together, wire together.”