Harvard‑backed study reveals each cup of coffee boosts healthy aging odds by 5%; How many cups should you have per day?
Coffee doesn't need any more good press than it already has.
Thanks to its rich source of antioxidants and certain compounds like caffeine, coffee can be beneficial for health. Moderate consumption of coffee has often been linked to reduced risks of type 2 diabetes, heart disease, liver and endometrial cancers, Parkinson's disease, and depression.
Moreover, coffee can also improve mood, enhance cognitive function, and boost physical performance. So, having your daily cuppa not only comes with great benefits, but also preps you for the hustle and bustle! But could your daily coffee habit be a secret to aging gracefully?
Turns out, the answer is yes.
A major new study, backed by Harvard's T.H. Chan School of Public Health, suggests so, and it might have you brewing another cup.
What does the study say?
In a massive study of nearly 50,000 women over a time frame of 30 years, researchers found that drinking more coffee – to a point – during midlife was linked to less chronic disease, physical mobility issues and cognitive decline in later years.
However, other caffeinated products, plus decaffeinated coffee, did not garner the same results.
The aforementioned
study
tracked 47,513 women from the US Nurses' Health Study, beginning between 1984 and 1986, when participants were aged 45–60.
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This wasn't superficial: to qualify, participants had to live past 70 and remain free of 11 major chronic diseases (including heart disease, cancer, stroke, diabetes), while maintaining robust mental, cognitive, and physical health.
Researchers followed them for over three decades, ending in 2016, and identified 3,706 women who met the criteria for "healthy aging."
Coffee intake – both in type and quantity – was tracked through rigorous questionnaires.
Researchers converted it into caffeine intake (measured per 80 mg unit, roughly the amount in a single espresso shot). On average, healthy agers consumed 315 mg of caffeine daily, the equivalent of three small cups of coffee.
What are the findings?
Dr Sara Mahdavi, from the Harvard T.H. Chan School of Public Health, as reported by New Atlas, stated, 'Our study has several key strengths,' adding, 'In addition to the large sample size and 30 years of follow-up, we assessed several different aspects of longevity and healthy aging as well as very comprehensive information on nutritional and lifestyle habits that were collected every four years after the initiation of the study.
'
What is the key takeaway?
Each extra cup of brewed caffeinated coffee—up to about five cups a day—was linked with a 2% to 5% increased chance of healthy aging.
Why does this matter?
Over time, modest gains stack up. For someone drinking three cups daily, versus none, that's around a 15% to 25% increased likelihood of aging healthily – a substantial difference.
As Dr Mahdavi stated, 'While past studies have linked coffee to individual health outcomes, our study is the first to assess coffee's impact across multiple domains of aging over three decades.'
As per her, 'The findings suggest that caffeinated coffee – not tea or decaf – may uniquely support aging trajectories that preserve both mental and physical function.'
More than caffeine: Coffee's unique blend
What's fascinating is that this benefit wasn't observed with tea, decaf, soda, or other caffeine sources. In fact, cola intake was linked to 19% to 26% lower odds of healthy aging per daily glass. This suggests that coffee's bioactive compounds, like chlorogenic acids, polyphenols, and diterpenes, play a starring role, beyond caffeine itself.
Harvard Health echoes this, noting that coffee's antioxidant components may improve insulin sensitivity and reduce inflammation.
According to Dr Madhavi, 'These results, while preliminary, suggest that small, consistent habits can shape long-term health.'
The bitter/sweet spot: 2 to 4 cups a day
As Dr Madhavi quoted, 'Moderate coffee intake may offer some protective benefits when combined with other healthy behaviors such as regular exercise, a healthy diet, and avoiding smoking.
While this study adds to prior evidence suggesting coffee intake may be linked with healthy aging, the benefits from coffee are relatively modest compared to the impact of overall healthy lifestyle habits and warrant further investigation.
'
What's the ideal number of cups, then?
Most health benefits plateau after 3 to 4 cups daily. Even Harvard Health states moderate intake (2 to 4 cups) is beneficial for longevity and cardiovascular health. The Mayo Clinic recommends up to 400 mg/day – about four cups – as a safe limit.
Moreover, drinking more than 5 cups daily has shown diminishing returns, and could bring downsides like anxiety, insomnia, digestive issues, or elevated cholesterol (especially from unfiltered brews). Besides, genetics also matters in this case, as individuals with slower caffeine metabolism may not experience the same benefits, and could be more sensitive to harm.
Coffee drinkers undergo lower risks of death as compared to non-coffee drinkers: Study
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