How many prunes a day do you need for bones?

About 50 g a day — roughly 5 to 6 prunes. A 100 g dose was tested in the same trial and gave no extra benefit, while far more women dropped out of that arm, so 50 g is the sensible, effective amount.

Is the prune bone research funded by industry?

Yes, and it is fair to know that. Most prune-and-bone research, including the main 12-month trial, is funded by the California Prune Board, though the funder had no role in the analysis. We still rate the evidence strong because independent university groups ran the trials and the results replicate across separate labs — but the funding is worth stating plainly.

Home · The Evidence Index · Perimenopause · Bone

Do prunes protect bone density?

Q: Do prunes protect bone density?

Yes, in postmenopausal women. In a confirmed 12-month randomised trial of 235 postmenopausal women with low bone density, about 50 g of prunes a day (5–6 prunes) preserved total hip bone density — it fell only 0.3% — while the group eating no prunes lost 1.1%. The effect is preserving bone, not rebuilding it: prunes appear to slow the loss that follows menopause rather than restore bone already gone.

Verdict — Strong (postmenopausal)

Reviewed against the AntiAgingGreens evidence standard · 12-month RCT, 235 postmenopausal women · Last reviewed July 2026

Yes — about 5 to 6 prunes a day preserved hip bone density over a year in postmenopausal women, while women eating none lost bone. Two honest framings: it prevents loss rather than rebuilding bone, and most of the research is funded by the prune industry.

You eat

~50 g prunes (5–6), daily

What's in them

Polyphenols, vitamin K, potassium and boron

In the body

Less bone breakdown (resorption)

Result

Hip bone density held steady over a year, instead of falling

The measured effect is preserving bone — keeping density from dropping — not adding bone back. After menopause, holding the line on hip bone is itself worthwhile.

What the evidence supports

✓ Preserved total hip bone density over 12 months (−0.3% vs −1.1% with none)¹
✓ 50 g/day (5–6 prunes) is the effective dose — 100 g gave no more
✓ Independent trials and a review agree

What it doesn't do

✗ Rebuild or reverse bone loss — it prevents loss, not restores
✗ Shown beyond postmenopausal women
✗ Come from blinded trials — a whole food can't be masked (open-label)

Where this comes from

Not supported Emerging Moderate Strong

Why it works: Prunes are rich in polyphenols and also supply vitamin K, potassium and boron — nutrients tied to bone. In cell and animal work these appear to slow bone resorption, the breakdown side of bone turnover, and support formation a little. After menopause, falling oestrogen tips that balance towards loss, so anything that slows the breakdown helps hold density steady.
What the human evidence shows: The anchor is a confirmed 12-month randomised trial in 235 postmenopausal women with low bone density. Total hip bone density fell 1.1% in the control group over the year, but only 0.3% in the group eating 50 g of prunes a day — a significant difference, and hip-fracture risk on the FRAX tool worsened in the controls while holding in the prune group.¹ A 100 g dose was no better and had far more dropouts, so 50 g is the effective amount. Earlier trials (Hooshmand 2011, using 100 g against dried apple) and a comprehensive review reach the same conclusion.²
Where the evidence stops — and a funding note: The effect is preserving bone, not reversing loss, and it is shown in postmenopausal women, so don't extend it further. Because a whole food can't be disguised, the trials are open-label. And the honest disclosure: most prune-and-bone research, including this trial, is funded by the California Prune Board. The funder had no role in the analysis, independent university groups ran the studies, and the results replicate across separate labs — which is why the rating stays strong — but you should know where the money came from.

Why we tell you who funded it: a result can be real and industry-funded at the same time, and hiding the funding would be the dishonest move. Here the trials were run by independent academics and replicate across labs, so we rate it strong — but we would rather you weigh that yourself than not know. We sell nothing and recommend no product; prunes are simply the food the evidence points to.

At a glance

Claim assessedEating prunes protects bone density

VerdictStrong in postmenopausal women — preserves hip bone density (does not rebuild)

Food & doseWhole prunes (dried plums), 50 g/day (~5–6); 100 g no better

PopulationPostmenopausal women with low bone density — 12-month RCT, 235 participants

Evidence typeOpen-label RCT + earlier trials + review

Funding noteLargely California Prune Board-funded; funder had no role in analysis; replicates across independent labs

Last reviewedJuly 2026

Sources

Prunes preserve hip bone mineral density in postmenopausal women: a 12-month randomized controlled trial (The Prune Study). American Journal of Clinical Nutrition, 2022. ajcn.nutrition.org
Dried plums, prunes and bone health: a comprehensive review. Nutrients, 2017. mdpi.com

Earlier corroboration: Hooshmand et al. (2011), 100 g dried plums vs dried apple, improved forearm and spine bone density in postmenopausal women.

Bottom line for you

If you're postmenopausal, a small daily habit of 5 to 6 prunes is a well-evidenced way to help hold onto hip bone density — the group that ate them kept their bone over a year while the group that didn't lost measurable ground. There's no benefit to eating more than about 50 g, and it pairs naturally with well-loaded strength training, which builds bone rather than just preserving it.

Keep the framing honest: prunes slow bone loss, they don't rebuild bone, the evidence is in postmenopausal women, and most of the research is prune-industry funded — run by independent academics and replicated, but funded all the same. A sensible, low-cost habit, not a treatment for diagnosed osteoporosis.

Educational information based on peer-reviewed human studies. Not medical advice — prunes support bone but do not replace treatment for diagnosed osteoporosis; speak to your clinician. AntiAgingGreens never sells or recommends supplements. We report what the evidence shows — and where it stops.