Occupational therapy is a client-centered health profession concerned with promoting health and well-being through occupation. As occupation has an effect on each person's health and well-being, occupation-based programs are implemented in the area of preventative care. The present self is said to exist through the accumulation of past occupations. Occupation is defined as an activity that a person "wants to do", "needs to do", or "is expected to do". The formula for occupation and health is d+b3=sh (doing, being, becoming, and belonging=survival and health). It means that by doing one's occupation, one is present, becomes their ideal self, and belongs, which makes survival and health possible. People's occupations are essential for their health since they enable engagement with others and society. A decline in social connectivity leads to a decline in cognitive, physical, and mental functions, and it has been the focus of attention in preventative care. To realize preventative care, it is necessary to maintain or acquire new social connections. In this article, we introduce and discuss occupational challenges and the practice of incorporating cognitive stimulation into one's occupation to reduce the decline in cognitive function in older adults. Interventions using highly individualized occupations should be considered for future preventative care strategies.
 Author's abstract