Women have long been warned that too much caffeine may be bad for their bones. A long-running study of older women has now taken another look at coffee, tea and bone density. The results offer some reassurance — and a useful reminder not to let one cup of coffee distract us from the much bigger picture of bone health.

There are pleasures in life that seem to acquire increasingly complicated terms and conditions as we get older.

Sunshine?

Lovely — but wear sunscreen.

Wine?

Perhaps not as heart-healthy as we once hoped.

Dessert?

We probably don't need to discuss it.

And then there is coffee.

For many women, the first cup of the morning is less a beverage than a small act of civilization.

So it is mildly alarming to hear that caffeine might be bad for our bones.

Particularly after menopause, when bone loss becomes a much more important health concern.

Should we be eyeing the coffee machine suspiciously?

Or replacing the morning latte with tea?

A recent study of thousands of older women offers a surprisingly reassuring answer.

But, as so often happens in nutrition research, the interesting part begins when the simple answer stops working.

First, Why Are Women's Bones Different After Menopause?

Bone may look permanent, but biologically it is anything but.

Throughout life, old bone is continually removed and new bone formed.

During youth, we generally build bone faster than we lose it. Later in life, that balance begins to shift.

For women, menopause matters because estrogen helps protect bone. As estrogen levels decline, bone loss can accelerate, particularly during the years around and after menopause. The National Institute on Aging notes that women can lose bone relatively quickly for several years around this transition.

If enough bone is lost, osteoporosis can develop.

And osteoporosis matters largely because of what comes next:

fractures.

A hip, wrist or spinal fracture in later life can mean pain, reduced mobility and loss of independence.

So researchers have naturally wondered whether everyday habits — including what we drink — might influence the process.

Which brings us back to the coffee pot.

Researchers Followed Older Women's Coffee, Tea and Bones

The 2025 study analyzed data from the Study of Osteoporotic Fractures, a long-running American cohort originally involving 9,704 women aged 65 and older.

At repeated visits over roughly a decade, researchers collected information about coffee and tea consumption.

They also repeatedly measured bone mineral density at the hip and femoral neck using DXA scanning — an objective clinical measurement rather than asking women how strong they thought their bones were.

That is one of the strengths of the research.

Instead of taking a dietary snapshot at one moment, the investigators could examine changes in beverage consumption and bone density over time.

They also statistically adjusted for factors including age, body weight, smoking, physical activity, calcium and protein intake, alcohol exposure, estrogen use and steroid medication.

So what happened?

Coffee Was Mostly… Uneventful

This may be excellent news for anyone reading with a mug in her hand.

In the main analysis, coffee consumption was not significantly associated with lower bone mineral density at either the femoral neck or total hip.

In other words, the researchers did not find convincing evidence that ordinary coffee drinking was associated with poorer bone density during the main follow-up period.

There was, however, an intriguing wrinkle.

When the researchers modeled coffee consumption by number of cups per day, their graphs suggested that consuming more than about five cups daily might be associated with lower bone density.

But this needs careful handling.

The formal statistical tests for a nonlinear relationship were not significant. The above-five-cup pattern was a visual suggestion from the model rather than proof of a scientifically established danger threshold.

So we cannot reasonably conclude:

Five cups are safe. Six cups damage your bones.

Biology rarely respects such convenient boundaries.

Tea Produced the More Interesting Result

Tea drinkers showed slightly higher total-hip bone mineral density than women who did not drink tea.

After extensive statistical adjustment, the difference was approximately:

0.003 grams per square centimeter.

That was statistically significant.

And it sounds rather encouraging.

Until we ask another question:

Was the difference actually large enough to matter to an individual woman?

The authors themselves say probably not.

They explicitly note that the approximately 0.003 g/cm² difference was below the threshold generally considered clinically meaningful for individual patient management.

This is an excellent example of something readers encounter constantly in health reporting.

“Statistically Significant” Doesn't Always Mean “Important”

Imagine measuring the height of several thousand women extremely precisely.

You might discover that one group is, on average, a few millimeters taller than another.

With enough participants, that difference could be statistically significant.

It might also be practically irrelevant.

The same principle applies here.

The study detected a small difference between tea drinkers and non-tea drinkers that was unlikely to be explained entirely by random chance within the statistical model.

But that does not mean drinking tea would produce enough additional bone density to change an individual woman's diagnosis, prevent her fracture or alter her treatment.

The researchers themselves say future studies need to examine actual fractures, rather than simply small differences in BMD, before we can know whether the association has meaningful clinical consequences.

So tea receives a promising footnote.

Not yet a superhero cape.

Why Might Tea Be Different?

Tea contains a mixture of biologically active compounds, including polyphenols known as catechins.

Laboratory and animal research has suggested that some of these compounds may influence cells involved in building and breaking down bone.

Previous human studies have also sometimes found associations between habitual tea drinking and higher bone density.

But the evidence is not consistent.

Some studies and meta-analyses have suggested benefits.

A randomized trial of green-tea extract in postmenopausal women found no meaningful change in bone mineral density.

Another meta-analysis also found no clear BMD benefit.

That inconsistency is important.

It suggests we should not leap from:

“Tea drinkers in this cohort had slightly higher hip BMD”

to:

“Tea strengthens bones.”

The first statement describes an observation.

The second claims causation.

We don't have that evidence.

Nutrition Research Has a People Problem

There is a wonderfully irritating problem with studying food.

People eat it.

And people who consume one thing often behave differently from people who consume another.

In this study, for example, coffee drinkers reported greater lifetime alcohol exposure than non-coffee drinkers, and smoking patterns also differed between some beverage groups.

Researchers can adjust statistically for those differences.

They did.

But statistical adjustment is not magic.

Perhaps tea drinkers have other dietary habits researchers did not measure.

Perhaps coffee drinkers exercise differently.

Perhaps cup size differs.

Perhaps one woman considers a tiny espresso a “cup” while another regards a mug large enough to bathe a small dog as one cup.

The study did not collect detailed information about cup size, beverage strength or specific coffee and tea varieties. The authors also acknowledge self-reporting, missing data and residual confounding as limitations.

This is why observational nutrition research can identify clues much more easily than it can establish causes.

Perhaps the Splash of Milk Deserves Some Credit

Caffeine has attracted suspicion partly because it can have a small effect on calcium balance.

But the size of that effect appears to be modest.

The study's discussion cites earlier human experimental work suggesting that, particularly when calcium intake is inadequate, caffeine can slightly reduce calcium absorption — an effect small enough that a modest amount of milk may compensate for it.

That does not mean every cup of coffee requires compulsory dairy accompaniment.

Milk is not a pharmaceutical antidote to espresso.

But it helps put the caffeine question into perspective.

Bone health is influenced by the whole diet and the whole person, not merely one molecule in one morning beverage.

Which brings us to a much more important point.

Coffee Probably Isn't the Biggest Bone Question

If a woman is genuinely concerned about osteoporosis, whether she drinks two cups of coffee or two cups of tea may be considerably less important than several much better-established factors.

Major bone-health organizations emphasize:

adequate calcium;

adequate vitamin D;

a balanced diet;

regular weight-bearing and muscle-strengthening physical activity;

not smoking;

and avoiding excessive alcohol.

Age, menopause, family history, low body weight, certain medical conditions and some medications can also increase osteoporosis risk.

And unlike the tiny tea association in this study, some of these factors have a substantial body of evidence behind them.

So if we are thinking about our bones over morning coffee, perhaps the better question isn't:

“Should I stop drinking this?”

It might be:

“When did I last think seriously about my bone health at all?”

Bone Loss Can Be Quiet

Osteoporosis is sometimes called a silent condition because bone loss itself usually doesn't hurt.

A woman can feel perfectly well while her bones gradually become less dense.

Sometimes the first obvious sign is a fracture.

That is one reason screening matters.

Current US Preventive Services Task Force guidance recommends osteoporosis screening for women aged 65 and older. It also recommends screening postmenopausal women younger than 65 who are at increased fracture risk after clinical risk assessment.

That is much more consequential information for an older woman than whether Earl Grey scored marginally better than coffee in one observational study.

And Bone Density Isn't the Whole Story Either

Bone mineral density is important.

But fractures depend on more than bone density alone.

Falls matter.

Muscle strength matters.

Balance matters.

Vision matters.

Medication can matter.

The physical environment matters.

A woman with somewhat stronger bones who falls repeatedly may be at greater practical fracture risk than someone with lower BMD who has excellent strength and balance.

This is another reason exercise matters.

Weight-bearing and muscle-strengthening activity help maintain bone and muscle, while balance and appropriate physical activity can also help reduce falls.

Bone health is not merely about producing a better number on a DXA scan.

It is about remaining upright, mobile and independent.

So Should You Switch From Coffee to Tea?

The evidence from this study does not justify recommending that women do so.

Tea consumption was associated with slightly higher hip BMD.

The effect was small.

Coffee showed no significant overall association with BMD in the main analysis.

Very high coffee consumption may deserve further research, but this study did not establish a precise harmful threshold.

And because the study was observational, it cannot prove that either beverage caused the differences observed.

There is another limitation worth mentioning.

The Study of Osteoporotic Fractures population consisted almost entirely of older White women in the United States.

The authors specifically caution against assuming that the same findings apply equally across racial and ethnic groups, where bone density, fracture patterns and dietary habits can differ.

So perhaps the most defensible conclusion is also the least dramatic:

For most women, an ordinary cup of coffee is probably not where the bone-health conversation should begin.

A Better Way to Read Nutrition Headlines

Studies like this one are useful partly because they teach us how to read health news.

When a headline says:

Tea linked to stronger bones

ask:

How large was the difference?

Was it clinically important?

Was the study observational or randomized?

Did researchers measure fractures or only BMD?

Was the population similar to me?

Does other research agree?

And perhaps most importantly:

Is this one small factor distracting me from something much more important?

Those questions work for coffee.

They also work for almost every “miracle food” we will encounter next week.

Lydia's™ Take

There is an appealing fantasy that health might eventually become simple.

Drink the right tea.

Avoid the wrong coffee.

Eat the correct berry.

Take the correct supplement.

And somehow the complicated business of aging will cooperate.

Unfortunately, the human body has shown little enthusiasm for that arrangement.

The new research on coffee, tea and women's bones is interesting precisely because it is not dramatic.

Tea drinkers had slightly higher hip bone density.

Ordinary coffee consumption did not appear to harm bone density overall.

Very heavy coffee consumption raised a question worth studying further.

And none of this means that tea is an osteoporosis treatment or coffee is a bone-health hazard.

Perhaps that is reassuring.

You probably don't need to reorganize your breakfast around one new paper.

A cup of coffee can remain a cup of coffee.

A cup of tea can remain a cup of tea.

And if either one accompanies a life that includes good nutrition, movement, appropriate screening and attention to the things that genuinely matter for bone health, so much the better.

Sometimes the healthiest response to a nutrition headline is not to change what is in the cup.

It is simply to keep the cup in perspective.

Medical Disclaimer

This article is for general informational and educational purposes only and does not constitute medical advice, diagnosis or treatment.

Coffee and tea consumption are only small components of overall bone health. Osteoporosis risk varies according to age, menopause history, previous fractures, family history, body weight, nutrition, physical activity, medications, medical conditions and other factors.

Women concerned about osteoporosis, bone density, fracture risk, calcium or vitamin D intake, or whether they should alter caffeine consumption should discuss their individual circumstances with an appropriate healthcare professional. Readers should not stop prescribed osteoporosis medication or substitute dietary changes for recommended screening or treatment on the basis of this article.

Research & Trusted Sources

Liu RY, Liu E. “Longitudinal Association of Coffee and Tea Consumption with Bone Mineral Density in Older Women: A 10-Year Repeated-Measures Analysis in the Study of Osteoporotic Fractures.” Nutrients. 2025;17:3660.

The principal study behind this article used repeated measurements of coffee and tea consumption and hip/femoral-neck BMD in older women. Tea drinking was associated with a very small increase in total-hip BMD, while ordinary coffee consumption showed no significant overall association with BMD.

The authors explicitly note that the tea-related BMD difference was below the threshold ordinarily considered clinically meaningful for an individual and that further research using actual fractures as an endpoint is needed.

U.S. Preventive Services Task Force — Osteoporosis Screening Recommendation (2025).

The USPSTF recommends osteoporosis screening for women aged 65 and older and for postmenopausal women younger than 65 who are at increased risk after clinical risk assessment.

National Institute on Aging — Osteoporosis.

NIA explains that bone loss can accelerate around menopause and outlines major osteoporosis risk factors, diagnosis and prevention considerations.

Bone Health & Osteoporosis Foundation — Prevention and Healthy Living.

BHOF emphasizes adequate calcium and vitamin D, appropriate exercise, balanced nutrition, avoiding smoking and limiting excessive alcohol as central components of lifelong bone health.