Tea and Dementia: Can What You Drink Help Protect Brain Health?
According to the World Health Organization (WHO), more than 55 million people worldwide are living with dementia, and the number of new cases is projected to rise by around 10 million every year.
While aging, genetics, and chronic conditions such as high blood pressure remain major risk factors for cognitive decline, research suggests that lifestyle choices can still make a meaningful difference. The CDC notes that nearly 40% of dementia cases may be prevented or delayed through modifiable factors.
Among the habits receiving growing attention is tea drinking. Several studies suggest that regular tea intake may support cognitive function and may be linked to a lower risk of dementia.
In this article, we’ll look at the connection between tea and dementia prevention, the types of tea most often associated with better brain health, and other beverages that may also help support long-term cognitive function.
A Tea Habit May Lower Dementia Risk
A study published in the Journal of Nutrition, Health and Aging examined how lifestyle habits relate to neurocognitive disorders.
The research followed 957 older Chinese adults aged 55 and above and found that people who drank tea regularly had a 50% lower risk of cognitive decline.
The findings were even more striking among participants who carried the APOE e4 gene, a genetic variant associated with a higher likelihood of developing Alzheimer’s disease, the most common form of dementia. In this group, daily tea drinkers showed an 86% lower risk of cognitive impairment.
These results suggest that tea may offer important neuroprotective benefits, even for people with elevated genetic risk.
Which Teas Are Best for Cognitive Function?
One interesting point from the research is that the brain-supporting effects were not limited to one specific type of tea. Freshly brewed green tea, black tea, and oolong tea were all associated with protective effects on cognition.
That means you may not need one “perfect” tea to support brain health. Several varieties appear to offer similar benefits.
1. Green Tea
Green tea comes from the leaves of the Camellia sinensis plant and is widely regarded as one of the healthiest beverages in the world.
It is rich in antioxidants that may help promote healthy aging and lower the risk of chronic disease. Green tea is also known for helping with:
- Metabolism support
- Fat burning
- Reduced fatigue
- Mental clarity
For brain health, green tea stands out because it contains polyphenols, which may help lower inflammation, and L-theanine, an amino acid linked to calmness and relaxation without causing drowsiness.
Nearly half of green tea’s beneficial plant compounds are catechins, and the most abundant of these is epigallocatechin gallate (EGCG). Some experts believe EGCG may play a role in protecting against cognitive decline, although stronger research is still needed to confirm this directly.
Even so, a systematic review of cohort studies has supported the idea that green tea consumption may be associated with a reduced risk of:
- Alzheimer’s disease
- Mild cognitive impairment
- General cognitive decline
2. Black Tea
Like green tea, black tea also comes from the Camellia sinensis plant. Although it is processed differently, it still contains powerful plant compounds that may help protect the brain.
Black tea provides:
- Polyphenols
- Flavonoids
- Antioxidants
These compounds may help neutralize free radicals, reduce oxidative stress, and support protection against chronic disease.
Research has also linked black tea with additional health benefits beyond cognition. One study found that black tea intake may help lower LDL cholesterol, often called “bad” cholesterol.
In addition, a study from the University of Newcastle in England reported that both black tea and green tea may help reduce the risk of Alzheimer’s disease.
3. Rosemary Tea
Although rosemary is best known as a culinary herb, it can also be enjoyed as a tea and may offer promising benefits for the brain.
Some early research suggests that a low dose of rosemary intake (750 mg) may be associated with faster memory performance. While more studies are needed, rosemary tea is often included among herbal drinks believed to support mental sharpness and memory.
Other Teas That May Support Brain Health
In addition to green tea, black tea, and rosemary tea, several other teas are often discussed for their possible cognitive benefits.
Popular options include:
- Peppermint tea
- Ginkgo biloba tea
- Matcha
- White tea
- Oolong tea
Although the amount of evidence varies from one tea to another, these drinks are commonly valued for their antioxidants, plant compounds, and potential effects on memory and focus.
Coffee as an Alternative Brain-Boosting Beverage
If tea is not your favorite, coffee may be another smart choice for cognitive support.
Scientific studies have shown that coffee may help improve:
- Alertness
- Focus
- Mental performance
- Clarity
Researchers at the Krembil Brain Institute explored the possible link between coffee consumption and a lower risk of Alzheimer’s disease. They analyzed compounds found in different coffee beans and found that coffee contains substances with possible neuroprotective effects that may help slow cognitive decline.
One notable compound in coffee is quercetin, a flavonoid with antioxidant properties that may help reduce inflammation and oxidative stress.
The researchers also identified compounds called phenylindanes, which form during roasting. These compounds may help interfere with the buildup of proteins associated with Alzheimer’s disease. Because dark roast coffee contains higher levels of phenylindanes, the researchers suggested it may offer stronger protective effects.
What About Caffeine and Dementia Risk?
Tea and coffee have something important in common: caffeine.
Since both beverages are often associated with better mental performance, researchers have also looked at whether caffeine itself may be connected to a lower risk of dementia or age-related cognitive decline.
Several studies have linked caffeine with improvements in thinking skills and cognition. One study published in the Journal of Nutrition suggested that caffeine intake from coffee may have long-term effects on mental performance.
That same research also found a relationship between alcohol intake and improved mental performance, although the researchers were not able to recommend a specific amount for memory benefits.
In the Baltimore Longitudinal Study of Aging, researchers from the National Institute on Aging examined caffeine, alcohol, and nutrient intake in 727 men and women. Participants who scored highest for both healthy diet quality and caffeine intake performed better on 10 memory tests than those with lower diet scores.
This suggests that caffeine may be helpful, but it likely works best as part of an overall nutrient-rich, healthy lifestyle.
How Caffeine May Affect the Brain
Caffeine is a well-known brain stimulant, but its effects go beyond simply making you feel awake.
It works partly by blocking adenosine receptors, which can reduce feelings of tiredness and increase alertness. This may lead to:
- Better concentration
- Faster mental processing
- Improved short-term cognitive performance
- Possibly more physical activity and engagement
However, the research is still evolving. At this point, there is not enough strong evidence to say with certainty that caffeine alone reduces the overall incidence of dementia.
Final Thoughts
Dementia risk is influenced by many factors, including age, genetics, and chronic illness, but lifestyle choices still matter. Research suggests that regularly drinking tea, especially varieties such as green tea, black tea, and oolong tea, may help support brain health and lower the risk of cognitive decline.
Other drinks, including rosemary tea and coffee, may also offer benefits thanks to their antioxidant and anti-inflammatory compounds.
The biggest takeaway is that no single beverage is a cure or guaranteed prevention strategy. But as part of a healthy routine that includes a balanced diet, physical activity, blood pressure control, and good sleep, choosing brain-friendly drinks may be one simple step toward protecting cognitive function as you age.
References
- World Health Organization. Dementia fact sheet.
- Centers for Disease Control and Prevention. Dementia is not normal aging.
- Feng L, Chong MS, Lim WS, et al. Tea consumption reduces the incidence of neurocognitive disorders: Findings from the Singapore longitudinal aging study. Journal of Nutrition, Health and Aging. 2016;20:1002–1009.
- Rao TP, Ozeki M, Juneja LR. In Search of a Safe Natural Sleep Aid. Journal of the American College of Nutrition. 2015;34(5):436–447.
- Research cited on black tea and LDL cholesterol reduction.
- Pengelly A, Snow J, Mills SY, Scholey A, Wesnes K, Butler LR. Rosemary and cognitive performance. Journal of Medicinal Food. 2012:10–17.
- Research from the Krembil Brain Institute on coffee compounds and Alzheimer’s-related brain changes.
- Journal of Nutrition study on caffeine, diet quality, and long-term cognitive performance.
