Brain reserve refers to a brain that has formed many cellular connections and is rich in brain cell density. The power of brain reserve is that we believe it has the ability to delay the clinical onset of neurodegenerative diseases such as Alzheimer’s Disease (AD). Simply put, AD will have to work longer and harder to manifest itself if it invades a brain that has built up reserve.
I often use the example of a brain that looks like a jungle versus one that looks like an island with one palm tree. In this example, the brain that looks like a jungle is the healthy brain because it has tremendous cellular connections like the density of a jungle and therefore brain reserve. If you think of AD as a weed whacker, it will invade the brain and begin to do its damage by destroying brain cells. However, it will take AD a long time to show any impact if it has to destroy a jungle’s worth of brain cell connections. In contrast, AD will manifest quickly after infiltration into the brain if it simply needs to destroy only a relatively few cellular connections (the island with one plam tree).
Brain reserve is developed over the lifespan as one exposes his or her brain to the novel and complex, the enriched environment on a daily basis. A Brain Health Lifestyle that involves Mental Stimulation (e.g. brain games), Physical Activity, Spirituality, Socialization, and Nutrition can help to build up brain reserve and maintain a healthy brain.