The functional fruit Ayurveda called first.
Jamun — Java plum, jambolan, neredu, naval pazham — has been the diabetic-friendly fruit of choice in Indian medicine for over a thousand years. Modern nutrition science is, finally, catching up.
A small fruit. A long list.
Per 100 g, fresh jamun delivers anthocyanins, polyphenols, vitamin C, fibre, and the bioactive compound jamboline — the last of which has been studied for its glucose-modulating effect for nearly a century.
The Indian Council of Medical Research, NIN Hyderabad, and dozens of peer-reviewed nutritional studies have documented jamun's profile. The traditional knowledge was right — we now have the spectrometry to prove it.
Per 100 g of fresh jamun.
Composite figures from USDA FoodData Central, Indian Food Composition Tables (NIN, 2017), and peer-reviewed analyses of Syzygium cumini. Values vary slightly by cultivar and ripeness; Konkan Bahadoli sits at the higher end of pulp and TSS.
| Nutrient | Amount per 100 g |
|---|---|
| Energy | 60 kcal |
| Water | 83.1 g |
| Carbohydrates | 15.5 g |
| — of which sugars | 14.0 g (mostly fructose & glucose) |
| Dietary fibre | 0.6 – 1.5 g |
| Protein | 0.7 g |
| Fat | 0.2 g |
| Vitamin C | 14 – 18 mg |
| Vitamin B6 | 0.04 mg |
| Folate | 3 µg |
| Calcium | 15 mg |
| Iron | 1.4 mg |
| Magnesium | 15 mg |
| Potassium | 79 mg |
| Anthocyanins (skin) | ~ 230 mg |
| Total polyphenols | ~ 540 mg GAE |
| Glycemic Index (estimated) | 25 – 35 (low) |
The six functional claims.
Glucose modulation
Jamboline and jambosine — bioactives in the seed and pulp — slow the conversion of starch to sugar. Jamun seed powder has been used in Ayurvedic and Unani diabetes management for centuries.
Antioxidant load
The deep purple comes from anthocyanins — among the most potent dietary antioxidants known. Jamun's polyphenol content rivals blueberry on multiple assays.
Low glycemic index
Despite the sweetness, jamun's GI sits between 25 and 35 — comfortably below most table fruit. Helpful for blood-sugar-conscious diets.
Heart-supportive
Potassium, dietary fibre, and polyphenolic compounds together support healthy blood pressure and lipid profiles in observational studies.
Digestive astringent
Traditionally used to settle the gut. Modern phytochemistry attributes this to tannins and gallic acid in the pulp and skin.
Immune-system support
Vitamin C plus iron in a single low-calorie fruit — useful seasonally, and a clean ingredient for functional-beverage formulators.
A thousand-year prescription.
In Ayurveda, jamun (jambū) is classified as kashaya (astringent) and madhura (sweet) — cooling, drying, and stabilising. The Charaka Samhita and Sushruta Samhita both reference jambū in formulations for prameha — the family of metabolic disorders that includes what we now call diabetes.
Three parts of the plant are used:
- Fruit pulp — fresh consumption, juice, kashaya.
- Seed powder — the most studied form for glycemic support.
- Bark and leaf decoction — astringent, antidiarrheal formulations.
Reading list.
For buyers and formulators who like primary sources.
- Ayyanar M, Subash-Babu P. Syzygium cumini (L.) Skeels: A review of its phytochemical constituents and traditional uses. Asian Pacific Journal of Tropical Biomedicine, 2012.
- Chaudhary B, Mukhopadhyay K. Syzygium cumini (L.) Skeels: A potential source of nutraceuticals. International Journal of Pharmacy and Biological Sciences, 2012.
- Indian Council of Medical Research – NIN. Indian Food Composition Tables. Hyderabad, 2017.
- Kumar A, Ilavarasan R, et al. Anti-diabetic activity of Syzygium cumini and its isolated compound against streptozotocin-induced diabetic rats. Journal of Medicinal Plants Research, 2008.
- Sharma B, Balomajumder C, Roy P. Hypoglycemic and hypolipidemic effects of flavonoid rich extract from Eugenia jambolana seeds. Food and Chemical Toxicology, 2008.
Nothing on this page is medical advice. Always consult a registered medical practitioner for clinical questions, especially around diabetes management.