Midlife coffee habits could play a role in ageing well, new research suggests. A study led by the Harvard T.H. Chan School of Public Health found that each extra cup of caffeinated coffee per day may slightly increase the chance of ageing without major health problems.
Longitudinal Study Assesses Caffeine’s Role in Later-Life
The study, based on over 30 years of dietary and health data from 47,513 U.S. women, was finalised in 2016. Its goal was to assess whether caffeine intake, particularly from coffee, had a measurable impact on health outcomes in later life.
Defining Healthy Ageing in Clinical Research
Researchers applied rigorous standards to measure healthy ageing. Participants had to survive to at least 70 years of age and remain free of 11 major chronic diseases, physical disabilities, cognitive impairments, mental health issues, and memory complaints.
Dietary data from 1984 and 1986 served as the baseline, with health outcomes tracked through questionnaires completed in 2014 and 2016. The analysis ultimately found that just over 3,700 of the women met the criteria for healthy ageing.
Caffeinated Coffee Emerges as the Primary Positive Variable
Caffeine consumption was analysed in increments of 80 milligrams—roughly the amount in a small cup of coffee. The median daily caffeine intake in the study was 315 mg, most of which came from coffee.
“We found that moderate intake of caffeinated coffee during midlife was modestly associated with healthy ageing later in life,” said Sara Mahdavi, study author and postdoctoral fellow at Harvard. “Each additional cup of coffee was linked to about a 2% higher chance of healthy ageing, while cola intake was associated with a 20% lower chance.”
The study found no significant association between healthy ageing and the consumption of tea, decaffeinated tea, or decaf coffee. Meanwhile, cola consumption stood out for its negative association with ageing well.
Health Guidance Requires a Personalised Approach
The researchers emphasised that coffee isn’t a universal solution. “Coffee is not universally beneficial,” Mahdavi cautioned. “Caffeine metabolism varies significantly based on both genetics and hormonal factors.”
She noted that prior research showed women with slower caffeine metabolism due to variations in the CYP1A2 gene might not benefit from high caffeine intake and could face adverse effects. “Personalised nutrition — taking into account both sex and genetic differences — will be key in future recommendations.”
Healthcare Experts Acknowledge Findings and Recommend Moderation
Medical professionals not involved in the study offered both praise and prudence. “Meta-analysis studies could further support the theory… We know that caffeinated coffee in moderation is safe for the general population,” said Bruce G. Rankin, DO.
Sherry Ross, MD, also supported the findings: “This study also shows that reducing the amount of sugary soft drinks should be encouraged for healthy ageing… Adding caffeinated coffee to your list of healthy lifestyle choices should be encouraged.”
While the findings do not prove causation, they provide a compelling case for including moderate coffee consumption as part of a balanced, healthy lifestyle for women. Future research will be key in confirming whether these benefits extend across more diverse populations and lifestyles.