Plums

Plums (genus Prunus) are a small, juicy stone fruit that come in a startling range of colors — red, gold, green, deep blue, and an almost-black purple — each wrapped around a single hard pit. They are close cousins of peaches, cherries, and apricots, and they are best known for two things: being a light, refreshing, low-calorie fruit, and having some of the richest antioxidant color of any common fruit in their dark skins. This page is about fresh plums. Their dried form, the prune, is a different food with its own concentrated strengths — the famous laxative effect and the best food-and-bone evidence anywhere — and it has its own page, so we will point you there rather than repeat it. Honesty matters here: most of the strongest health research is on prunes, not fresh plums, and a lot of the fresh-plum evidence is laboratory or animal work. What is fair to say is that plums are a genuinely good whole fruit — hydrating, colorful, gently good for digestion, and easy on blood sugar. This page covers what plums actually are, what is inside them, the antioxidants in their skin, their mild digestive effect, the honest truth about bones, heart, and blood sugar, how they compare with prunes, and how to pick and store them.

Table of Contents

1. What Plums Are
2. Nutritional Profile
3. Antioxidants & Polyphenols
4. Digestion & Sorbitol
5. Bone Health: An Honest Look
6. Heart Health & Blood Pressure
7. Blood Sugar & Glycemic Load
8. Fresh Plums vs Prunes
9. How to Select, Ripen & Store
10. Safety & the Pit
11. Research Papers
12. Connections
13. Featured Videos

What Plums Are

A plum is the fruit of several closely related trees in the genus Prunus, part of the rose family (Rosaceae). Botanically it is a drupe, or stone fruit — a soft, fleshy fruit built around one hard central pit — which makes it a sibling of peaches, nectarines, cherries, apricots, and almonds. What sets plums apart is their sheer variety. There are hundreds of cultivars, but two great groups cover most of what you will find in a market:

• Japanese plums (Prunus salicina). Despite the name, these were domesticated in China and later developed in Japan. They are the large, round or heart-shaped, very juicy plums you usually eat out of hand — think of the bright red, crimson, and near-black “Santa Rosa,” “Black Beauty,” and “Friar” types, plus yellow and green ones. They are softer, sweeter-tart, and are almost always eaten fresh rather than dried.
• European plums (Prunus domestica). These are typically smaller, oval, and denser, often a deep blue-purple with a dusty bloom. This group includes the prune plums (such as Italian and damson types) whose high sugar and firm flesh make them ideal for drying into prunes or cooking into jams and bakes. Greengages and mirabelles — small, intensely sweet green and golden plums — belong here too.

You may also meet pluots, plumcots, and apriums — hybrids of plum and apricot, bred for sweetness and unusual color. And you will see the whole rainbow of skin colors: gold and green plums on one end, and on the other the dark red, purple, and black-skinned plums that carry the most pigment. That color is not just for looks. The deep hues come from anthocyanins, and the darker the skin, the more of these antioxidants it tends to hold — which is why the antioxidant content of plums ranges so widely from one variety to the next. A pale-yellow plum and a black-skinned one are the same fruit nutritionally in most respects, but very different in the pigment antioxidants of their skin.

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Nutritional Profile

Fresh plums are a light, hydrating, low-calorie fruit rather than a nutrient powerhouse. A medium plum (about 65 grams) is only around 30 calories and roughly 87% water, with very little fat or protein. Two small plums make a satisfying snack for under 70 calories. Their value comes from being low in calories and generous in water, plus a modest, useful spread of vitamins, potassium, fiber, and skin-borne plant compounds. Here is what a couple of typical plums, eaten with the skin, provide:

• Water (about 87%) — this is why a ripe plum is so refreshing and filling for so few calories, and part of why it gently helps with hydration and digestion.
• Vitamin C (about 10 mg per 100 grams, roughly 10% of a day's target in two plums) — a modest but real source that supports collagen and antioxidant defense. Note that most of this vitamin C is lost when plums are dried into prunes, so fresh plums have the edge here.
• Vitamin K — plums supply a small amount of vitamin K (around 6 mcg per 100 grams), which matters for both blood clotting and bone.
• Potassium (about 155 mg per 100 grams) — a modest amount of this heart- and blood-pressure-friendly mineral, paired with almost no sodium.
• Fiber (about 1.4 grams per 100 grams; roughly 2 grams in a couple of plums) — a modest mix of soluble fiber (pectin) and insoluble fiber, a real contribution to the 25–38 grams most people fall short of. Much of it sits in the skin.
• Sorbitol — plums naturally contain sorbitol, a sugar alcohol the gut absorbs slowly. Fresh plums carry far less than prunes, so the effect is mild, but it is the reason a few plums can gently loosen the bowels (see below).
• Natural sugars (about 10 grams per 100 grams) — a mix of glucose, fructose, and sucrose. Because the total is small and comes bundled with fiber and water, the effect on blood sugar is gentle.
• Anthocyanins & chlorogenic acid — the antioxidant plant compounds, concentrated in the skin (see the next section). These, not the vitamins, are what make a dark plum nutritionally interesting.
• Small amounts of many others — copper, manganese, magnesium, and B vitamins including some folate all appear in minor but real quantities.

The single most useful nutrition point about plums: the polyphenols and pigments are concentrated in the skin, not the pale flesh. So wash them and eat them whole — peeling a plum throws much of its antioxidant value away.

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Antioxidants & Polyphenols

Antioxidants are where plums genuinely shine. Dark-skinned plums rank among the higher-antioxidant common fruits, and the reason is their rich mix of polyphenols, again concentrated in and just under the skin.

• Anthocyanins. These are the red, purple, and blue-black pigments that give dark plums their color — the same family of antioxidants found in blueberries, cherries, and red cabbage. They live in the skin, so a deep-purple or black plum carries far more of them than a pale yellow or green one. This single fact explains the wide antioxidant range between plum varieties. For the fuller story of these pigments, see Anthocyanins.
• Chlorogenic and neochlorogenic acids. These are the dominant phenolic acids in plum flesh and skin — the same family found in coffee and many other fruits — and they are major contributors to a plum's antioxidant activity, present even in the paler flesh.
• Flavonols and other polyphenols. Quercetin, catechins, and rutin round out the mix, adding to the overall antioxidant capacity.

Two honest caveats keep this in perspective. First, the numbers vary enormously by variety, ripeness, and growing conditions: surveys of plum and peach germplasm have found antioxidant content differing several-fold between cultivars, and some dark plum varieties measure among the richest phenolic fruits tested — so there is no single “plum” antioxidant value. Second, a high antioxidant reading in a laboratory dish is not the same as a proven health benefit in people. Plum and peach polyphenols have shown promising effects in test-tube and cell studies, but that is a long way from proving plums prevent disease. What is fair to say: plums, especially dark ones eaten with the skin, deliver a genuine and varied dose of antioxidants as part of a whole-fruit diet.

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Digestion & Sorbitol

Fresh plums have a gentle, natural reputation for helping keep you regular, and unlike many folk beliefs this one has a clear mechanism behind it. Three things do the work, and one of them is the key:

• Sorbitol — the main reason. Plums contain sorbitol, a sugar alcohol the small intestine absorbs slowly and incompletely. The unabsorbed part acts as a mild osmotic laxative: it draws water into the bowel, which softens the stool and encourages the urge to go. Fresh plums hold much less sorbitol than dried prunes do, so the effect is gentle — a few plums nudge things along without the strong push of prunes.
• Fiber. The soluble and insoluble fiber in plums adds a little bulk and holds water, supporting comfortable, regular bowel movements as part of your overall fiber intake. Eating the skin gives you more.
• Water. A ripe plum is mostly water, which on its own helps keep things moving and stool soft.

If your real goal is relieving constipation, prunes (dried plums) are the stronger, better-studied tool — in a randomized trial they even outperformed the fiber supplement psyllium — because drying concentrates the sorbitol and fiber. Fresh plums are the gentler, everyday version of the same idea. The full guide to the mechanism, the trial evidence, and how many to eat is on the Prunes page; for the condition itself see Constipation, and pears work through the same sorbitol route.

The flip side is worth knowing: the very sorbitol and fiber that help can cause gas, bloating, or loose stools if you eat a lot of plums at once. Because plums contain both sorbitol and excess fructose, they are a FODMAP fruit, so people with irritable bowel syndrome or fructose malabsorption may find large servings trigger symptoms. If that is you, keep portions small and see how you do.

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Bone Health: An Honest Look

Bone health is the one plum-related benefit with genuinely strong human evidence — but here honesty is essential, because that evidence is for dried plums (prunes), not fresh plums. It would be misleading to let a page about fresh plums quietly borrow the credit, so here is the straight story.

Several well-conducted human trials show that eating about 50 grams of prunes a day (5–6 prunes) helps preserve bone mineral density in postmenopausal women. In the 12-month “Prune Study,” women who ate prunes held on to hip bone density while the no-prune group lost bone over the same year. This is one of the strongest food-and-bone evidence bases in all of nutrition. Prunes appear to work mainly by slowing the breakdown of bone, helped by their polyphenols plus bone-relevant nutrients like boron, vitamin K, potassium, and copper — all of which drying concentrates.

Why doesn't the same apply to fresh plums? Because the trials used dried plums specifically, and drying multiplies the dose of the very compounds thought to matter. No one has run the equivalent long-term bone trials on fresh plums, so it would be a stretch to claim a proven bone benefit for them. Fresh plums do supply small amounts of the same bone-supporting nutrients (vitamin K, potassium, copper, polyphenols), so they fit a bone-friendly diet — but if bone protection is your specific aim, the evidence points to prunes. Read the details on the Prunes page, and see Osteoporosis for the bigger picture. As always, food complements — not replaces — calcium, vitamin D, exercise, and any prescribed treatment.

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Heart Health & Blood Pressure

Plums fit comfortably into a heart-healthy way of eating, but it is worth being straight about how strong the evidence actually is — and for fresh plums specifically, it is modest.

The plausible reasons plums should be heart-friendly are the same ones that make most whole fruits a good idea. Their potassium paired with almost no sodium supports healthy blood pressure — potassium helps the body relax blood vessels and shed excess sodium. Their fiber and abundant skin polyphenols add anti-inflammatory and cholesterol-nudging value. And they are filling for very few calories, which helps with weight, itself a major driver of heart risk.

The honest limitation is that there are essentially no large human trials showing that eating fresh plums, on their own, lowers heart disease. The most direct experimental evidence is an animal study: in obese, diabetes-prone rats, polyphenol-rich plum and peach juice reduced several cardiovascular and metabolic risk factors. That is genuinely encouraging — but it is rats drinking concentrated juice, not people eating fruit, so it cannot be treated as proof. Broader research on diets rich in whole fruit and flavonoids points in a favorable direction, and plums belong in that pattern. The fair conclusion is simple: plums are a sensible part of a heart-healthy diet, not a heart medicine.

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Blood Sugar & Glycemic Load

Plums taste sweet, which leads some people to assume they spike blood sugar — but a whole fresh plum actually has a low glycemic load. There are two reasons. First, the total sugar in a plum is small (only about 6–7 grams each). Second, that sugar comes wrapped in fiber, sorbitol, and a lot of water, all of which slow how quickly it is absorbed. The result is a gentle, gradual rise rather than a sharp spike.

The key distinction, as with most fruit, is whole fruit versus juice. In large studies following tens of thousands of people over many years, eating whole fruit — with plums, peaches, and apricots among the fruits examined — was linked to a lower risk of type 2 diabetes, while drinking fruit juice, which strips out the fiber and concentrates the sugar, was linked to a higher risk. A whole plum and a glass of plum juice are not the same thing for your blood sugar.

Practical takeaways for anyone watching blood sugar: a fresh plum is a reasonable fruit choice; pairing it with a little protein or healthy fat (nuts, cheese, yogurt) steadies the response further; and it is best to favor whole plums over juices. Keep in mind that prunes, being dried, are far more sugar- and calorie-dense per bite — still a low-to-moderate glycemic food, but eaten by the handful they add up fast, so portion matters more with the dried form.

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Fresh Plums vs Prunes

A prune is simply a plum with most of its water removed — usually a European prune-plum variety bred for the job. Same fruit, very different food, and it helps to know which one you want:

• Fresh plums are hydrating and light: about 87% water, only ~30 calories each, with more vitamin C (drying degrades it) and a milder, gentler effect on digestion and blood sugar. They are the everyday, eat-out-of-hand fruit.
• Prunes (dried plums) concentrate everything the water leaves behind: far more sorbitol and fiber (making them a stronger, well-proven remedy for constipation), more potassium and boron, and the standout, trial-backed bone-density benefit. The trade-off is that drying also concentrates the sugar and calories, so a serving is a few prunes, not an open bag.

Neither is “better” — they simply do different jobs. Reach for fresh plums as a refreshing, low-calorie fruit, and for prunes when you specifically want their digestive or bone benefits. The full detail on the dried form lives on the Prunes page.

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How to Select, Ripen & Store

A little know-how makes the difference between a hard, sour disappointment and a plum worth the season.

• Choosing. A good plum is plump, has a rich, even color for its variety, and yields slightly to gentle pressure, especially at the stem and tip. It should feel heavy for its size and smell faintly sweet. Avoid rock-hard fruit (picked too early), and skip any with bruises, cracks, or shriveled skin. That dusty, silvery-white coating on dark plums — the bloom — is a natural, harmless wax the fruit makes itself; it is actually a sign of freshness and gentle handling, not something to worry about.
• Ripening. Plums ripen and soften after picking, so it is fine to buy them slightly firm. Leave them at room temperature, out of direct sun, for a few days until they give to a gentle squeeze. To speed things up, put them in a loosely closed paper bag, which traps the fruit's natural ethylene gas. Ripe plums grow juicier and more fragrant — though, like most stone fruit, they do not get much sweeter once off the tree, so tree-ripe fruit in season is the tastiest.
• Do not refrigerate unripe plums. Cold storage before they are ripe can cause chilling injury — a mealy, dry texture. Refrigerate plums only once they are ripe, to slow them down, and eat within about three to five days.
• Washing and eating. Rinse just before eating (washing early invites mold) and eat the skin — that is where the anthocyanins and much of the fiber live.
• Ways to enjoy. Fresh and whole; sliced into yogurt, oatmeal, or salads; roasted or grilled until jammy; simmered into a compote; or baked into tarts and cakes. Ripe halves freeze well for smoothies, a good way to rescue a glut before it turns.

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Safety & the Pit

Plums are very safe for almost everyone — a simple whole-food fruit. A few specific points are worth knowing:

• Digestive sensitivity. Because of their sorbitol and fructose, plums are a FODMAP fruit. Eaten in large amounts they can cause gas, bloating, or loose stools, and people with irritable bowel syndrome may be more sensitive. For most people a couple of plums is simply an easy, gut-friendly snack; if you are prone to symptoms, start with a small portion.
• The pit and its kernel. The hard stone at a plum's center holds a single seed, or kernel. Like the kernels of apricots, peaches, and bitter almonds — all close relatives — it contains amygdalin, a natural cyanogenic glycoside the body can convert into cyanide. Laboratory measurements confirm meaningful amygdalin in these kernels, so do not eat the kernel inside the pit, and keep them away from children, who are affected by smaller amounts. (This is also why “laetrile,” marketed as “vitamin B17,” a supposed cancer remedy made from such kernels, is both unproven and dangerous.)
• Two reassurances. Accidentally swallowing a whole, intact pit is not a cyanide danger — the hard shell passes through undigested — but it is a choking hazard, so cut the fruit off the pit for small children. And the flesh of the plum is completely safe; this caution applies only to the seed hidden inside the stone.
• Oral allergy syndrome. People allergic to birch pollen sometimes get an itchy mouth, lips, or throat from raw plums and other stone fruits, because a plum protein resembles the main birch-pollen allergen. It is usually mild and limited to the raw fruit. Anyone whose reaction goes beyond a mild itchy mouth — hives, swelling, trouble breathing — should see an allergist.

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Research Papers

1. Igwe EO, Charlton KE. A systematic review on the health effects of plums (Prunus domestica and Prunus salicina). Phytotherapy Research. 2016;30(5):701–731. doi:10.1002/ptr.5581 — The most comprehensive review of plum-specific research, covering antioxidants, bone, heart, and digestion, with honest notes on how much is still preliminary.
2. Kim DO, Chun OK, Kim YJ, Moon HY, Lee CY. Quantification of polyphenolics and their antioxidant capacity in fresh plums. Journal of Agricultural and Food Chemistry. 2003;51(22):6509–6515. doi:10.1021/jf0343074 — Measured the polyphenol content and antioxidant capacity of fresh plums, confirming they are a meaningful antioxidant source.
3. Gil MI, Tomás-Barberán FA, Hess-Pierce B, Kader AA. Antioxidant capacities, phenolic compounds, carotenoids, and vitamin C contents of nectarine, peach, and plum cultivars from California. Journal of Agricultural and Food Chemistry. 2002;50(17):4976–4982. doi:10.1021/jf020136b — A foundational measurement of the vitamin C, carotenoids, and phenolics in plums and their stone-fruit cousins.
4. Tomás-Barberán FA, Gil MI, Cremin P, Waterhouse AL, Hess-Pierce B, Kader AA. HPLC-DAD-ESIMS analysis of phenolic compounds in nectarines, peaches, and plums. Journal of Agricultural and Food Chemistry. 2001;49(10):4748–4760. doi:10.1021/jf0104681 — Identifies chlorogenic and neochlorogenic acids as the dominant polyphenols and anthocyanins as the pigments of dark plum skin.
5. Cevallos-Casals BA, Byrne D, Okie WR, Cisneros-Zevallos L. Selecting new peach and plum genotypes rich in phenolic compounds and enhanced functional properties. Food Chemistry. 2006;96(2):273–280. doi:10.1016/j.foodchem.2005.02.032 — Found dark-skinned plum varieties among the richest in phenolics and anthocyanins, explaining the wide range between cultivars.
6. Vizzotto M, Cisneros-Zevallos L, Byrne DH, et al. Large variation found in the phytochemical and antioxidant activity of peach and plum germplasm. Journal of the American Society for Horticultural Science. 2007;132(3):334–340. doi:10.21273/JASHS.132.3.334 — Shows antioxidant content varies several-fold between plum varieties, so there is no single “plum” number.
7. Usenik V, Kastelec D, Veberič R, Štampar F. Quality changes during ripening of plums (Prunus domestica L.). Food Chemistry. 2008;111(4):830–836. doi:10.1016/j.foodchem.2008.04.057 — Tracks how sugars, acids, and anthocyanins change as plums ripen — the science behind picking and storing them well.
8. Noratto G, Martino HS, Simbo S, Byrne D, Mertens-Talcott SU. Consumption of polyphenol-rich peach and plum juice prevents risk factors for obesity-related metabolic disorders and cardiovascular disease in Zucker rats. The Journal of Nutritional Biochemistry. 2015;26(6):633–641. doi:10.1016/j.jnutbio.2014.12.014 — The animal study behind the honest, modest heart claim: plum and peach juice lowered cardiovascular risk factors in obese rats (rats, not people).
9. Muraki I, Imamura F, Manson JE, et al. Fruit consumption and risk of type 2 diabetes: results from three prospective longitudinal cohort studies. BMJ. 2013;347:f5001. doi:10.1136/bmj.f5001 — Whole fruits (plums, peaches, and apricots among them) were linked to lower type 2 diabetes risk; fruit juice to higher risk.
10. De Souza MJ, et al. Prunes preserve hip bone mineral density in a 12-month randomized controlled trial in postmenopausal women: the Prune Study. The American Journal of Clinical Nutrition. 2022;116(4):897–910. doi:10.1093/ajcn/nqac189 — The strongest bone evidence is for dried plums (prunes): about 50 g/day preserved hip bone density over a year, not fresh plums.
11. Wallace TC. Dried plums, prunes and bone health: a comprehensive review. Nutrients. 2017;9(4):401. doi:10.3390/nu9040401 — Reviews why the bone-protective evidence belongs to prunes (dried plums) rather than fresh plums.
12. Bolarinwa IF, Orfila C, Morgan MRA. Amygdalin content of seeds, kernels and food products commercially-available in the UK. Food Chemistry. 2014;152:133–139. doi:10.1016/j.foodchem.2013.11.002 — Measures the cyanide-releasing amygdalin in stone-fruit kernels, the basis for the warning not to eat the seed inside the pit.

PubMed Topic Searches

• PubMed: Plum polyphenols, anthocyanins & health
• PubMed: Plum sorbitol & digestion
• PubMed: Dried plums (prunes) & bone mineral density
• PubMed: Stone-fruit kernels, amygdalin & cyanide

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Connections

• Prunes (Dried Plums)
• Peaches
• Cherries
• Pears
• Apples
• Grapes
• Blueberries
• Anthocyanins
• Vitamin C
• Vitamin K
• Potassium
• Constipation
• Osteoporosis
• Irritable Bowel Syndrome (IBS)
• All Foods

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