Brain teasers can and do help keep the mind stay sharp. Like the muscles in your body, your mind strengthens with daily stimulation and can atrophy if neglected and not used. This is why it is important to use the mind and continually challenge it. Being involved in leisure activities that help stimulate your brain can help you live a longer and happier life. Studies have shown that time spent stimulating the brain may help prevent developing dementia and Alzheimer's disease.