What does this mean in practice?

If you're drinking 4-5 cups of coffee daily thinking it's good for your brain, you might want to cut back. The research suggests there's a tipping point where coffee stops helping and starts hurting.

What should you do next?

Stick to 2-3 cups of coffee per day max if cognitive health is a goal. That's about two standard mugs. If you currently drink more, try swapping your afternoon cups for tea — you'll get caffeine without the potential downside. Add at least one cup of tea daily. Green tea is well-studied, but black tea and other types showed benefits too.

Your Daily Coffee Habit Might Protect Your Brain — If You Get the Dose Right

Drink too little coffee and you might miss out on brain protection. Drink too much and you could increase your risk. A new analysis of over 450,000 people tracked for more than a decade reveals the sweet spot.

Bottom line: Coffee helps your brain at 2-3 cups daily, but more than that might backfire. Tea shows benefits at any amount.

What the Research Found

Researchers analyzed 10 studies following 450,000 dementia-free adults for an average of 11.5 years. Coffee drinkers who had 2-3 cups daily (about 300-450 mL) showed the lowest dementia risk. But here's the catch: people drinking 3 or more cups per day actually had higher rates of Alzheimer's disease.

Tea told a different story — the more people drank, the lower their dementia risk, with no upper limit found. This protection was consistent across black, green, and other tea types.

The study combined data from cohort studies — not the gold standard, but with nearly half a million people, the patterns are hard to ignore.

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