A research group led by Professor Kazutoshi Nakamura of the Niigata University Graduate School investigated the relationship between the intake of coffee, green tea, and caffeine in middle-aged and elderly Japanese and the risk of dementia. We obtained strong evidence of high intake and low risk of dementia.The effect of green tea was not clear.
Although many studies have shown that coffee has a preventive effect on lifestyle-related diseases (diabetes, etc.), the scientific support for the preventive effect on dementia has been insufficient.This time, we surveyed 40 Japanese (Murakami cohort study participants) aged 74 to 13,757 years.The intake of coffee, green tea, and caffeine (derived from multiple beverages) was calculated from the dietary and luxury items of the self-administered questionnaire, and new outbreak information of dementia (8-year follow-up) was obtained from the database of certification for long-term care. ..
As a result of the analysis, the incidence of dementia decreased as the coffee intake increased, and the incidence of the group who consumed the maximum daily intake of 3 cups or more was 0.53 times that of the non-drinking group.This association was found in all age groups and was more pronounced in men than in women.In addition, the incidence of dementia tended to decrease as the intake of green tea increased, but it was not a statistically definite decrease.
Furthermore, the higher the caffeine intake, the lower the incidence of dementia, and the incidence of the highest intake group (median 449 mg / day) was 58 times that of the lowest intake group (median 0.65 mg / day). Was similar to the case of coffee.
This study strongly suggests that coffee has a dementia-preventing effect.In particular, ingestion of 3 cups or more per day reduces the risk of dementia by about half, and caffeine may be involved in the preventive effect on dementia.However, other factors such as personality and behavior peculiar to coffee lovers may have an effect, and longer-term observation is required.
Paper information:[Journal of the American Geriatrics Society] Association of coffee, green tea, and caffeine with the risk of dementia in older Japanese people