Prunes and Aloo Bukhara Benefits: Bones, Digestion and Dose
Published on 11 September, 2026
Prunes, known across South Asia as aloo bukhara, have unusually good evidence behind them for a dried fruit. A 12-month randomized controlled trial found that 50 grams a day preserved hip bone mineral density in postmenopausal women, in a group whose controls lost bone over the same period. A separate trial found prunes performed comparably to psyllium for chronic constipation.
Both findings come with a specific and practical dose, which is the useful part.
Prune Nutrition
Per 100 grams of dried prunes, roughly ten:
| Nutrient | Per 100 g |
|---|---|
| Energy | 240 kcal |
| Carbohydrate | 63.9 g |
| Fiber | 7.1 g |
| Protein | 2.18 g |
| Potassium | 732 mg |
| Vitamin A | 39 mcg RAE |
| Magnesium | 41 mg |
| Calcium | 43 mg |
| Iron | 0.93 mg |
| Vitamin B6 | 0.205 mg |
Potassium is the standout at 732 mg, one of the higher figures in any fruit and relevant to blood pressure. Fiber at 7.1 grams per 100 grams is substantial, and prunes also contain sorbitol, a sugar alcohol the body absorbs slowly, which draws water into the bowel. Sorbitol and fiber together explain the laxative effect.
The energy density is the trade-off. At 240 kcal per 100 grams, prunes are concentrated, and a serving is smaller than most people assume.
Bone Density, Where the Evidence Is Strongest
A single-center randomized controlled trial published in the American Journal of Clinical Nutrition followed 235 postmenopausal women, average age 62, for twelve months. Participants were allocated to a control group, 50 grams of prunes daily, or 100 grams daily.
- Total hip bone mineral density fell by 1.1% in the control group over twelve months, which is the ordinary trajectory after menopause.
- The 50-gram group preserved it, changing by only 0.3%. The effect appeared by six months and held at twelve.
- Compliance was around 90% in the 50-gram group.
- Dropout was 41% in the 100-gram group, against 15% for 50 grams and 10% for the control.
That dropout figure is as useful as the bone result. Doubling the dose did not double the benefit, and most people could not sustain 100 grams of prunes a day. Fifty grams, about five or six prunes, is the amount that both worked and proved liveable.
A related trial reported that prunes also preserved cortical density and estimated strength at the tibia over the same twelve months. This is a real finding in a specific group, postmenopausal women, over one year. It is a useful dietary addition rather than a treatment for osteoporosis, and anyone diagnosed with low bone density should be following the plan their physician has set.
Constipation
Prunes are among the best-established foods for this, and a comparative trial gives a useful sense of scale. Researchers randomized adults with chronic constipation to green kiwifruit, prunes at 100 grams a day, or psyllium at 12 grams a day, for four weeks. The proportion of people responding was similar across all three.
Prunes therefore sit alongside psyllium rather than below it, which is a strong position given psyllium carries an authorized health claim. Prune juice has also been studied and improves symptoms, though whole prunes bring the fiber that juice leaves behind.
Start smaller than the trial dose. Going straight to 100 grams produces predictable results that most people would rather avoid. Three or four prunes daily for a week, then building, is a gentler way in.
Other Contributions
- Potassium. At 732 mg per 100 g, prunes contribute meaningfully toward an intake most people fall short of, which matters for blood pressure.
- Vitamin K and boron. Both are involved in bone metabolism and are among the components proposed to explain the bone findings.
- Polyphenols. Prunes are rich in them, and these are an active area of research rather than a settled benefit.
- Satiety. Fiber and chewiness make a small portion surprisingly filling, which is useful if you are managing appetite.
How Many, and Who Should Take Care
Five or six prunes a day, about 50 grams, is the dose with evidence behind it and the one most people can maintain.
- Build up gradually. Sorbitol and fiber together cause gas, cramping and loose stools if you increase suddenly. Add over one to two weeks and drink more water.
- Count the sugar if you are managing blood sugar. Prunes are concentrated. They have a lower glycemic response than the sugar content alone suggests, thanks to fiber and sorbitol, but portion still matters and they should sit within your carbohydrate plan.
- Watch the calories if that matters to you. 50 grams is around 120 kcal, easy to exceed while eating absent-mindedly.
- Kidney disease. The potassium content is high enough to matter if your intake is being managed. Ask your clinician.
- Irritable bowel syndrome. Prunes are high in sorbitol, one of the fermentable carbohydrates known as FODMAPs, and can aggravate symptoms in people sensitive to them.
- Dental care. Sticky dried fruit clings to teeth. Rinsing afterward is sensible.
Buying and Storing
Choose plain dried prunes without added sugar, and check for sulfites if you react to them, though prunes are less commonly sulfited than lighter dried fruits. Pitted is more convenient; unpitted often tastes better and keeps longer.
Store in an airtight container in a cool place. Prunes that have hardened can be revived by soaking in hot water for a few minutes, which also makes them easier to eat and adds the soaking liquid, useful if digestion is the reason you are eating them.
Where They Fit
Prunes are one of the few everyday foods with two separate, well-designed trials behind two distinct uses. Neither result is dramatic, and both matter. Preserving bone density that would otherwise decline, and improving bowel regularity as effectively as a proven fiber supplement, are both meaningful outcomes for five or six pieces of fruit a day.
They work best as a habit rather than a course. The bone trial ran a full year, and the benefit tracked with people who kept eating them.
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YO1 Longevity & Health Resorts sits on 1,300 acres in the Catskills, New York. Guests begin with a personal wellness consultation with a Health Counselor, and our Digestive Health Management program combines dietary guidance with Ayurvedic and naturopathic therapies, yoga and meditation, delivered by trained practitioners. Meals are sattvic vegetarian cuisine served at regular times and built around whole foods, fiber and fresh produce. YO1 is a wellness resort rather than a medical facility, so bone density and digestive conditions stay with your own physician.
To learn more or plan your stay, visit yo1.com or get in touch with the YO1 team.
FAQs
Q: How many prunes should I eat a day?
A: Five or six, about 50 grams, is the dose used in the bone density trial and the one participants could sustain. The 100-gram arm of the same study had a 41% dropout rate, so more is not better. Build up over one to two weeks if you are not used to the fiber.
Q: Do prunes really help bone density?
A: In postmenopausal women, yes, according to a 12-month randomized trial of 235 participants. Total hip bone mineral density fell 1.1% in the control group while the 50-gram prune group essentially preserved it. It is a dietary addition, not a treatment for diagnosed osteoporosis.
Q: Are prunes better than psyllium for constipation?
A: A four-week comparative trial found prunes, psyllium and green kiwifruit produced similar response rates in adults with chronic constipation. Prunes are food and psyllium is cheaper per dose, so the choice comes down to preference and tolerance.
Q: How long do prunes take to work for constipation?
A: Usually within a day or two, though giving any change a week is fairer. Sorbitol draws water into the bowel and fiber adds bulk, and both act reasonably quickly.
Q: Is prune juice as good as whole prunes?
A: Prune juice improves symptoms in trials and is easier for some people to take, but juicing removes most of the fiber while concentrating the sugar. Whole prunes are the better default; juice is a reasonable alternative if chewing is difficult.
Q: Are prunes the same as aloo bukhara?
A: Aloo bukhara is the South Asian name for plums, and dried aloo bukhara are what English-speaking countries call prunes. Some Indian shops sell a tarter dried plum under the same name, which is a different variety but the same fruit family.
Q: Can diabetics eat prunes?
A: In measured portions counted within a carbohydrate plan. Prunes produce a lower glycemic response than their sugar content suggests, because of fiber and sorbitol, but they are concentrated. Discuss the amount with your dietitian.
Q: Why do prunes cause gas?
A: Sorbitol is a sugar alcohol that ferments in the colon, and prunes are also high in fiber. Both cause gas when intake rises suddenly. Increasing gradually over a week or two reduces it considerably.
Q: Do prunes help with weight loss?
A: They are filling for their size, which helps with appetite, but they are energy dense at around 240 kcal per 100 grams. They fit into a weight loss diet as a measured snack rather than as something to eat freely.
Q: Should I soak prunes?
A: It helps if they have hardened, makes them easier to eat, and gives you the soaking liquid as well, which is useful if you are eating them for digestion. It is not necessary otherwise.
Sources
- De Souza MJ, et al. Prunes preserve hip bone mineral density in a 12-month randomized controlled trial in postmenopausal women. The American Journal of Clinical Nutrition. 2022. PMID 35798020.
- Prunes preserve cortical density and estimated strength of the tibia in a 12-month randomized controlled trial. Osteoporosis International. 2024. PMID 38349471.
- Chey SW, et al. Exploratory Comparative Effectiveness Trial of Green Kiwifruit, Psyllium, or Prunes in US Patients With Chronic Constipation. The American Journal of Gastroenterology. 2021. PMID 34074830.
- Prune Juice Containing Sorbitol, Pectin, and Polyphenol Ameliorates Subjective Complaints of Constipation. The American Journal of Gastroenterology. 2022. PMID 35971232.
- US Department of Agriculture, FoodData Central. Plums, dried (prunes), uncooked. SR Legacy.
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