Prunes may be among the most surprising fruits when it comes to nutrition for strong bones. Research from Penn State University shows that eating four to six prunes daily can help postmenopausal women maintain their bone density and strength. This may significantly reduce the risk of bone fractures.
Researchers used advanced 3D techniques to show that women who regularly ate prunes experienced less loss of bone structure in weight-bearing areas — such as hips and lower back — than women who did not eat prunes. The presence of anti-inflammatory compounds makes this dried fruit a potential ally in slowing bone loss.
The 5 Key Takeaways
- Want to keep your bones strong after menopause? Discover how a handful of these sweet fruits can make a difference.
- Curious how a simple dietary addition can keep your bones in top condition? Read on and discover the surprising power of prunes.
- Wondering if there’s a natural alternative to medication for bone loss? This article is worth your time.
- Want to know how advanced 3D technology can measure your bone quality? Discover the latest insights and the role of prunes.
- Looking for a simple way to lower your risk of bone fractures? Learn how this flavorful fruit can support you.
Prunes for Bone Strength in Women
Milk has long been seen as the go-to source of calcium, but it’s certainly not the only food that contributes to strong bones. Researchers at Penn State University report that prunes can help maintain bone structure and strength in postmenopausal women. Their study, published in Osteoporosis International, showed that daily prune consumption can slow age-related bone loss and reduce fracture risk. It’s a familiar pattern in how we approach nutrition: something as simple as a fruit turns out to have significant value.
“This is the first randomized, controlled study to examine bone structure, geometry, and estimated strength in three dimensions,” says Mary Jane De Souza, professor of kinesiology and physiology at Penn State. “We found that daily prune consumption influenced factors that affect fracture risk. That’s clinically very relevant.” This statement underscores the importance of the study for physicians and lifestyle advisors.
Eating healthy is one thing — sticking with it is another.
Aging and Bone Remodeling
Bone tissue is constantly in motion. Through a process called bone remodeling, specialized cells — osteoblasts and osteoclasts — replace old bone tissue with new material. As we age, that balance becomes disrupted: breakdown happens faster than buildup. This makes the skeleton more fragile and susceptible to fractures. What once seemed automatic requires more attention later in life.
When this process accelerates, bone loss occurs. Bone density decreases and bone becomes more porous. According to the Centers for Disease Control and Prevention, more than 10 million Americans experience this to some degree — particularly women and older adults are at risk. It’s therefore important to gain timely insight into the causes of accelerated bone loss and find ways to slow it down.
Glossary
- Osteoblasts: Cells responsible for building new bone tissue.
- Osteoclasts: Cells responsible for breaking down old bone tissue.
- Bone loss: A condition in which bone becomes brittle and breaks more easily.
- Cortical bone: The compact, outer part of bone that provides strength and load-bearing capacity.
- Tibia: The shinbone, a weight-bearing bone in the lower leg.
Prunes as Natural Bone Strengtheners
Bone loss is particularly a concern for postmenopausal women. During this life stage, estrogen production declines — a hormone that has a protective effect on the skeleton. Less estrogen typically means faster bone mass loss. While medications exist to slow this process, many women choose not to use them. In my own circle of friends, I recognize this hesitation: you want to do something, but preferably without pills.
According to De Souza, prunes could offer an accessible alternative. They contain polyphenols — bioactive compounds with anti-inflammatory properties. These compounds may influence processes that contribute to bone loss. Polyphenols in prunes are linked in multiple studies to the maintenance of healthy bone structures.
Traditional studies often used DXA scans (dual-energy X-ray absorptiometry) to measure bone mineral density in 2D. This method is suitable for a general indication but lacks information about bone structure and quality. The researchers emphasize that more insight is needed into how strong and resilient bone actually is — something that DXA alone cannot reveal.
“In our study, we found that daily prune consumption influenced factors related to fracture risk. That is clinically invaluable.”
Mary Jane De Souza, leading professor of kinesiology and physiology
Viewing Bone Quality in 3D
“With a DXA scan, we see how much bone someone has,” De Souza explains, “but that tells us little about its quality. Thanks to three-dimensional imaging, we do get information about bone structure, geometry, and micro-architecture. In other words: how well the bone is able to handle load.” A bone that looks solid is not automatically a strong bone.
To investigate the effect of prunes on bone quality, the team conducted a 12-month randomized study with 235 postmenopausal women. Participants were divided into three groups: no prunes; a daily serving of 50 grams (approximately four to six pieces); or 100 grams (approximately ten to twelve pieces). Every six months, measurements were taken with a peripheral quantitative CT scan (pQCT), which provides a three-dimensional image of bone density and bone strength. The researchers carefully examined changes over time.
Results: Prunes Support Bone Health
After twelve months, women in the control group — who ate no prunes — showed a measurable decrease in bone density and bone strength in the shinbone (tibia). Participants who ate four to six prunes per day maintained their bone structure, especially in cortical bone, the outer, weight-bearing part of the skeleton. A small daily adjustment proved to have a major impact.
Although the group eating ten to twelve prunes per day also saw improvements, this higher dose proved harder to maintain. Many women dropped out due to taste fatigue. Four to six prunes per day appears to be not only effective but also more sustainable long-term. Finding the right amount is essential — nutrition only truly works when it fits your lifestyle.
Preventing Bone Fractures with Prunes
“These are pretty exciting data for a 12-month study,” De Souza says. “We saw preservation of bone mass in cortical bone — the part that bears the body’s weight. That’s exactly what’s crucial to reducing fracture risk.” This finding supports the claim that daily prune consumption can be effective in maintaining bone health.
According to De Souza, prune consumption might also help reduce the risk of bone loss, though she emphasizes that further research is needed. Health is rarely black and white — more often a series of steps in the right direction.
“We were able to preserve and maintain bone in the cortical bone that bears weight, and preservation of cortical bone and bone strength is essential to avoiding bone fractures.”
Mary Jane De Souza, leading professor of kinesiology and physiology
This study builds on earlier research into the relationship between prunes and bone health. In a previous publication, eating prunes for a year also led to preservation of bone mass in the hip. In later studies, researchers have delved deeper into possible mechanisms of action — for example, how the bioactive compounds in prunes affect the gut microbiome. The research team indicates they want to pursue these lines further. Further research on prunes and bone health remains desirable.
Verified Sources
“Prunes preserve cortical density and estimated strength of the tibia in a 12-month randomized controlled trial in postmenopausal women: The Prune Study” by Kristen J. Koltun, Nicole C. A. Strock, Connie Weaver, Hang Lee, Nancy I. Williams, Connie J. Rogers, Janhavi Damani, Mario G. Ferruzzi, Cindy H. Nakatsu, and Mary Jane De Souza, February 13, 2024, Osteoporosis International. DOI: 10.1007/s00198-024-07031-6
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Frequently Asked Questions
How healthy are prunes?
Prunes are rich in fiber, vitamins, potassium, and antioxidants. They support good digestion, boost the immune system, and can have anti-inflammatory effects. It’s a compact fruit with surprisingly significant health value.
Do prunes help you have good bowel movements?
Yes. Thanks to the combination of soluble fiber and the natural sugar alcohol sorbitol, prunes are known for their mild laxative effect. They stimulate bowel movement and can provide relief for sluggish digestion.
How many prunes can you eat per day?
A serving of four to six dried prunes per day is often considered effective and safe. Larger amounts can cause gas or diarrhea in some people. Most importantly, listen to your own body and build up gradually.
What month are prunes ripe?
Fresh prunes are typically ripe and available from July through September. The exact harvest time can vary by variety and climate. Dried prunes, on the other hand, are available year-round.
How many prunes can a person eat per day?
For most adults, four to six dried prunes per day is manageable. You can eat more in principle, but consider your digestion. Excess can have a laxative effect.
Can prunes reduce belly fat?
Prunes are low in calories, high in fiber, and provide a feeling of fullness. While they’re not a direct fat burner, they can contribute to weight management through healthy eating within a balanced lifestyle.
