Many habits contribute to poor brain health, but four areas can have the most influence. 

They are too much sitting, lack of socializing, inadequate sleep, and chronic stress. 

"The good news is that they also can be the easiest to change," says Rudolph Tanzi, director of the Genetics and Aging Research Unit and co-director of the McCance Center for Brain Health at Harvard-affiliated Massachusetts General Hospital.

You can read more about it here: https://www.health.harvard.edu/mind-and-mood/the-worst-habits-for-your-brain