Final answer:
Research indicates that increasing our daily energy expenditure is associated with longer life expectancy, related to selective optimization with compensation as we age.
Step-by-step explanation:
Research suggests that the more we expend energy in our daily lives, the longer we are expected to live. This concept is in line with the theory that as we age, our available energy diminishes, and we engage in a process called selection, where we choose personal goals that are most likely to optimize the returns for the effort we exert. This strategy is a form of compensation for the loss of our energy resources. This perceived increase in life expectancy is reflected in the statement that life becomes more exciting when we have more to expect, to look forward to, and to watch. The proactive engagement with life's activities helps improve our quality of life, including better eating habits and a more peaceful demeanor.