讀後心得

Coffee and tea are popular worldwide and have garnered significant attention for their effects on cognitive function. Studies show that consuming 2 to 3 cups of green tea daily can significantly reduce the risk of cognitive decline, while an intake of 100 to 400 milligrams of caffeine can effectively reduce the risk of dementia. Physician 謝珮甄 points out that green tea is particularly effective in improving cognitive function, while the effects of black tea and oolong tea are relatively weaker. Regarding coffee, drinking 2.5 cups of coffee per day can lower the risk of Alzheimer's disease, but excessive consumption should still be approached with caution, especially for those with gastrointestinal issues.

Coffee and tea are very popular beverages worldwide, and their effects on cognitive function have garnered widespread attention. Research shows that drinking 2 to 3 cups of green tea daily can significantly reduce the risk of cognitive decline, while consuming 100 to 400 milligrams of caffeine each day is particularly helpful in lowering the risk of dementia.

Since the 1990s, the medical community has begun to explore the impact of coffee and tea on cognitive function. According to a systematic review published in 2020, moderate intake of coffee and tea helps reduce the risk of dementia. For individuals already experiencing cognitive impairment, such as those with mild cognitive impairment or dementia, caffeine may have a beneficial effect. For instance, in mild cognitive impairment patients with higher plasma caffeine levels, the risk of progressing to dementia was significantly lower; additionally, short-term consumption of green tea was associated with improvements in mild cognitive impairment.

Regarding tea selection, studies indicate that green tea has greater benefits. Consuming 2 to 3 cups of green tea daily is closely related to reducing the risk of cognitive decline; however, the protective effects of black tea and oolong tea are weaker, with most studies failing to show significant positive impacts. It is generally recommended to consume 2 to 4 cups of tea daily, which is considered an ideal range.

In terms of caffeine intake, studies show that moderate doses (100 to 400 milligrams) of caffeine have the most significant effect in reducing the risk of dementia, while amounts below 100 milligrams or above 400 milligrams typically do not have clear protective effects. The caffeine content varies among different coffee beverages; therefore, consumers are advised to check the labels to understand the content.

According to a systematic analysis in 2024, consuming 2.5 cups of coffee can minimize the risk of Alzheimer's disease, and drinking 1 cup of tea daily can reduce the risk of cognitive impairment by 11%. However, despite the potential benefits of coffee and tea on cognitive function, experts advise caution for those with gastrointestinal discomfort or ulcers, as excessive consumption may trigger adverse reactions.