Coffee or tea? It’s a question that sparks lively debate in kitchens, offices, and cafés around the world. Both drinks have devoted fans, but beyond taste, what does science say about their effects on our health? Two nutrition experts recently spoke with Damon Syson at The Telegraph UK to weigh in on the benefits of these beloved beverages, exploring how they support bone, gut, heart and brain health.
Coffee versus tea: A global perspective
Tea holds the title as the most popular drink on the planet after water, with an estimated three cups consumed globally for every cup of coffee. But tastes are shifting. Recent figures reveal that 63% of adults regularly drink coffee, slightly ahead of the 59% who enjoy tea.
Coffee’s rising popularity is partly driven by recognition of its health benefits, particularly its role in digestion. “Coffee is one of the main sources of polyphenols in Western diets, and these plant compounds act as food for your gut microbes, leading to better metabolic health and lower inflammation,” explains Professor Tim Spector, epidemiologist, author, and co-founder of science and nutrition company Zoe. Black tea also contains beneficial polyphenols, but usually at lower levels per cup.
So which is better for your health? Let’s break it down.
Bone health: Tea takes the lead
When it comes to bones, tea has the edge. Research suggests that regular tea drinkers may have a lower risk of developing osteoporosis. A decade-long study of nearly 10,000 women aged 65 and older, conducted by Flinders University in Adelaide, found that daily tea drinkers had slightly higher bone mineral density (BMD) in their hips than non-tea drinkers. Moderate coffee intake doesn’t appear harmful, but consuming more than five cups daily is linked to reduced bone density, especially among women with higher alcohol intake.
Registered dietitian Aisling Pigott recommends limiting caffeine to three drinks per day, whether tea or coffee. “High intakes of caffeine can negatively affect bone health,” she says. “Tea has lower caffeine than coffee, making it potentially less detrimental. Tea also contains flavonoids, which may support bone metabolism.”
Flavonoids are natural plant-based antioxidants that promote the formation of new bone while slowing the breakdown of existing bone. Found in tea, fruits, vegetables, and herbs, they help manage oxidative stress and inflammation. “While there’s still a lot we don’t fully understand about flavonoids, diets rich in these compounds seem to have a positive impact on health,” adds Pigott.
Gut health: Coffee steals the spotlight
For gut health, coffee comes out ahead. Both coffee and tea are rich in polyphenols or plant compounds that support the gut microbiome, but coffee generally contains higher levels. Green tea has more polyphenols than black tea, but coffee remains the richer source overall.
“Polyphenols are broken down by gut microbes in the colon into smaller, active substances,” explains Spector. “These substances can help reduce inflammation, support blood sugar control and maintain healthy blood vessels. Different microbes prefer different polyphenols, so a mix of coffee, tea, fruits, vegetables, herbs and spices helps nurture a healthier gut ecosystem over time.”
Coffee also provides dietary fibre, primarily soluble fibre, which feeds gut microbes. A typical cup of filter coffee contains about 1.5 grams of fibre, roughly the same as a tangerine, contributing toward the recommended 30 grams per day.
However, Pigott warns that caffeine can aggravate gut issues in sensitive individuals. “For those with existing digestive conditions, high caffeine intake may worsen symptoms. Decaffeinated coffee still delivers gut-friendly fibre and polyphenols, making it a good alternative.”
Heart health: Tea has the edge
Both tea and coffee may protect cardiovascular health, but tea comes slightly ahead. Antioxidants and polyphenols in tea, particularly flavan-3-ols, help maintain flexible, healthy blood vessels, which supports blood flow and reduces blood pressure. Regular green tea consumption has been associated with lower cardiovascular risk factors, including cholesterol levels and blood pressure, according to a 2022 review of studies.
“While moderate coffee consumption may support heart health, tea appears to offer a slight edge in cardiovascular benefits,” says Pigott. “The polyphenols in tea can positively influence risk markers, but how much benefit you gain depends on how much and how you drink it.”
Concentration: coffee wins
Caffeine boosts alertness and concentration, and brewed coffee generally contains about twice as much caffeine as tea. This makes coffee particularly effective for short-term focus and productivity. However, overconsumption can lead to anxiety, overstimulation and sleep disturbances, which ultimately undermine concentration.
“Coffee can give a notable boost in alertness due to higher caffeine levels,” Pigott notes. “But it’s important to remember the potential for a post-caffeine slump and excessive intake can disrupt sleep, which harms brain function.”
Spector adds, “Most positive evidence for coffee benefits revolves around two to four cups per day. Beyond that, the limiting factor is usually sleep and nervous system effects rather than the gut.”
Brain health: A draw
When it comes to long-term brain health, coffee and tea are on par. Both drinks are linked to a reduced risk of dementia and stroke. Harvard Medical School research on over 130,000 people found that drinking two to three cups of caffeinated coffee daily or one to two cups of tea reduced the risk of cognitive decline by 15–20%. Decaffeinated versions did not show the same benefit, highlighting caffeine’s potential neuroprotective effect.
A 2025 study tracking over 200,000 UK midlifers for nine years found regular coffee drinkers were 34% less likely to develop Alzheimer’s disease, 37% less likely to develop Parkinson’s, and 47% less likely to die from neurodegenerative conditions. Tea shows similar benefits, especially when consumed regularly and unsweetened.
Pigott emphasizes that most studies are observational. “We can see a connection between coffee or tea and brain health, but it’s not a direct causal link. Caffeine and antioxidants may play a role, but further research is needed.”
The verdict: Coffee slightly ahead
If judged purely on research, coffee slightly edges out tea, mainly because more studies have focused on coffee’s long-term effects. “Coffee has the strongest evidence for benefits including metabolic health, cardiovascular health, and a more favourable microbiome,” Spector explains. “Black tea is still a very good choice with polyphenols and gentler caffeine, but the healthiest option depends on your biology. If coffee makes you jittery or disrupts sleep, tea is better. If you tolerate coffee, there’s no reason not to enjoy it.”
Pigott agrees: “There’s no stark difference. Both drinks provide nutrients and plant compounds that may support health. Whether it’s a morning coffee or a tea with friends, hot beverages are part of a comforting routine. Choose the one you enjoy most.”
