How Many Calories and How Much Protein Are in Plums, and How They Fit Into a Diet

Plums are one of those fruits people either eat by the kilo in season or ignore completely. The numbers are simple: a fresh plum is cheap in calories, while a prune is concentrated sugar that disappears in ten seconds. Here is exactly what is in each and how to fit it into your daily intake.

Calories: fresh plums

Per 100 grams of fresh plums you get roughly:

• 46 kcal
• 11.4 g carbohydrates, of which about 10 g sugar
• 1.4 g fiber
• 0.7 g protein
• 0.3 g fat

One medium plum weighs 60-70 g, so 28-32 kcal. A handful of five plums (about 330 g) is roughly 150 kcal. For comparison, 100 g of apple is 52 kcal and 100 g of banana is 89 kcal. Fresh plums sit near the bottom of the calorie-density scale, and it is hard to overdo them: half a kilo is still only 230 kcal, but it is also half a kilo of food in your stomach.

Prunes are a different story

Drying removes about 80% of the water, so 100 g of prunes comes to 240 kcal, 64 g carbohydrates (about 38 g sugar) and 7 g fiber. One prune is 9-10 g, so about 24 kcal. The problem is that fifteen of them go down with a coffee without you noticing — that is 360 kcal, a whole meal. Count out 4-6 pieces (100-145 kcal) and put the bag back in the cupboard.

Protein: essentially none

A fresh plum has 0.7 g protein per 100 g, a prune 2.2 g. One fresh plum gives you half a gram. To pull 20 g of protein out of plums — the amount that belongs in one decent meal — you would need close to 3 kilograms of them and over 1,300 kcal. Not an option.

So plums do not count toward your protein intake. If you eat them as a snack, attach a protein source:

• 200 g Greek yogurt or skyr — 18-20 g protein
• 100 g cottage cheese — 11-13 g protein
• 30 g protein powder in water — 22-25 g protein
• 30 g almonds — 6 g protein, but also 170 kcal, so budget for it

Fiber and sorbitol

Prunes carry about 7 g fiber and about 15 g sorbitol per 100 g. Sorbitol is a sugar alcohol that pulls water into the gut, and that is why prunes help with constipation — not magic. Trials used a dose of 100 g per day (10-11 prunes) over three weeks.

If you jump from zero straight to 100 g, you get bloating and cramps. More practical: start with 4 prunes a day plus at least 2 liters of water, hold that for 5 days, then increase if you need to. People with irritable bowel syndrome often do not tolerate sorbitol even in small amounts.

How it fits into a diet

In a deficit, fresh plums are useful because you get a lot of volume for few calories. A few concrete ways to slot them in:

• Deficit snack: 300 g fresh plums (140 kcal) with 150 g skyr (90 kcal, 15 g protein) — a 230 kcal snack that actually holds you.
• 45-60 minutes before training: 2-3 fresh plums (60-90 kcal) or 3 prunes (70 kcal). More than that and the fiber sits in your gut right as you start your third set of squats.
• After training: 5 prunes (120 kcal, 30 g carbs) alongside 30 g protein — easy to get down when you have no appetite.
• In a bulk: prunes are a painless way to add 200-300 kcal a day without feeling stuffed.

A rule that works: keep fruit at 15-20% of daily calories. On 2,400 kcal that is 350-480 kcal, roughly 400 g of fresh plums plus one other piece of fruit. Anything above that eats the space meant for protein.

Jam, compote and brandy

Homemade plum jam with no added sugar runs 200-250 kcal per 100 g; one tablespoon is 20 g, so 40-50 kcal. Store-bought versions with sugar reach 270 kcal. Compote is deceptive — the fruit is fine, but 100 ml of the syrup carries 15-20 g sugar, so drain it. Plum brandy at 40% is about 220 kcal per 100 ml; a 50 ml shot is 110 kcal with zero nutrients, and alcohol in larger amounts blunts recovery after training.

Blood sugar

The glycemic index is around 40 for fresh plums and around 29 for prunes — both low, because fiber and sorbitol slow absorption. That does not mean unlimited: 100 g of fresh plums is about 10 g of sugar. If you have type 2 diabetes, the practical move is 2-3 fresh plums with a protein or fat source, then check your glucose 90 minutes later to see your own response instead of trusting a table.

Choosing between 100 g of fresh plums and 100 g of prunes is choosing between 46 and 240 kcal. Same plant, five times the number.

When to see a doctor

• Constipation lasting more than 3 weeks despite 25-30 g of fiber and 2 liters of water a day.
• Blood in your stool, black stool, or unintentional loss of 5 kg or more over a few months — this is not a diet experiment, go now.
• You have kidney disease: 100 g of prunes carries about 730 mg of potassium, a serious number if your intake is restricted.
• You take warfarin: prunes have about 60 mcg of vitamin K per 100 g. You do not have to avoid them, but keep intake steady week to week and tell your doctor.
• Itching of the lips, throat or tongue after fresh plums — usually oral allergy syndrome, a cross-reaction with birch pollen. If swelling or breathing trouble appears, treat it as an emergency.

The short version

• Fresh plums: 46 kcal and 0.7 g protein per 100 g; one medium plum is about 30 kcal.
• Prunes: 240 kcal per 100 g, about 24 kcal each — count out 4-6, do not eat from the bag.
• Protein is negligible, so pair them with yogurt, cottage cheese or protein powder.
• For constipation, start with 4 prunes a day and 2 liters of water, working up to 100 g if needed.
• Keep fruit at 15-20% of daily calories; jam and brandy count, and they count expensively.