Study: Regular Coffee and Tea May Lower Dementia Risk, but More Is Not Better

At a Glance (China Coffee Network): A study on coffee, tea and dementia risk brings good news for middle-aged and older adults—regular moderate drinking of coffee or tea significantly lowers the risk of late-life cognitive decline, though more is not better.

As we reach middle age, many of us fear suddenly developing dementia one day. Memory declining off a cliff—misplacing keys, forgetting plans, drawing a blank on a friend’s name—is a chilling thought. Recently, a study on coffee and tea intake, dementia risk and cognitive function brought good news for middle-aged and older adults: drinking coffee or tea regularly can significantly reduce late-life cognitive decline and the probability of developing dementia.

The paper tracked long-term lifestyle and brain-health data from a large population and reached its core conclusion after excluding confounding variables such as age, underlying disease and daily routines. Compared with groups that rarely touch coffee or tea, subjects who drank both beverages in moderation daily showed lower risks of all-cause dementia and more stable performance on core cognitive indicators such as memory and logical thinking.

The brain-protective logic is not complicated: caffeine and chlorogenic acid in coffee, and tea polyphenols and catechins in tea—multiple antioxidants—can reduce neuroinflammation in the brain and decrease deposition of beta-amyloid protein that damages neurons; abnormal accumulation of this protein is a typical pathological feature of dementia. At the same time, the active compounds improve cerebral blood flow, maintain oxygen supply to brain cells, and delay cognitive aging.

But the study clearly debunks the myth that “the more you drink, the smarter you get.” When daily total intake of coffee and tea exceeds healthy limits, excess caffeine keeps stimulating the nerves, causing chronic insomnia, anxiety and blood-pressure swings; sleep deprivation directly accelerates the buildup of metabolic waste in the brain, completely reversing the original brain-protective advantage. Data show that 1–2 cups of coffee or 2–3 cups of light tea per day is the range with the highest benefit; mixing small amounts of coffee and tea can even work better than drinking just one.

The article also reminds the public that beverages are only an auxiliary protective measure. Avoid drinking strong tea or coffee on an empty stomach, add less high-sugar cream, and combine with regular exercise, a balanced diet and active mental engagement to comprehensively safeguard brain health. Relying solely on guzzling coffee and tea not only fails to avoid dementia risk but may add physical burden. In short, coffee and tea are affordable natural “brain helpers,” and only by following the principle of moderation can the benefit be maximized—sipping in moderation is the lasting way to treat your brain well.