What implies the phrase "use it or lose it" related to brain cells?

The phrase "use it or lose it," in the context of brain cells, highlights the principle that cognitive stimulation and activity are crucial for maintaining neural health. When brain cells and their connections are not actively engaged or used, they may undergo a process of pruning, where unused neural pathways and connections become weakened or die off. This process demonstrates the brain's efficiency, as it tends to eliminate connections that are not beneficial or frequently utilized, thereby supporting the growth and maintenance of those that are actively used. Therefore, the understanding that active engagement is necessary to keep brain cells and their connections healthy underlines the correct interpretation of this phrase. This serves as a reminder of the importance of cognitive activities and learning throughout life to foster brain health and development.