The present study focused on senescence delay and examined the effects of Japanese diets from different years to identify which Japanese diet is most effective in enhancing life expectancy and delaying senescence.

In the group that ingested the typical 1975 Japanese diet, life span was prolonged, senescence was delayed, and learning and memory capacities were maintained compared with the group fed the Japanese diet popular in 2005.

This suggests that the traditional Japanese diet is more effective in enhancing life expectancy and delaying senescence than the current Japanese diet.