True or False: A lack of mental exercise throughout life can lead to faster brain shrinkage.

The correct answer is true. Engaging in mental exercise throughout life has been shown to have a protective effect on brain health, potentially slowing down the natural decline that comes with aging. Regular cognitive activities, such as learning new skills, solving puzzles, or engaging in stimulating conversations, can help maintain neural connections and support brain plasticity. This continuous mental engagement is crucial in preserving brain volume and function, while a lack of such stimulation may lead to accelerated brain shrinkage and cognitive decline over time.

The other options suggest varying degrees of ambiguity regarding the relationship between mental exercise and brain shrinkage. However, extensive research supports the idea that consistent mental activity is beneficial, indicating a clear link in this context.