💎 Key Nutrients
What Is Kumquats? Origin and Varieties
Kumquats (genus Fortunella) are among the smallest citrus fruits cultivated worldwide, distinguished by their edible sweet peel and tart pulp, a contrast to most citrus whose rinds are discarded. They originated in southern China and Southeast Asia where they were cultivated for centuries before spreading to Japan, Europe, and more recently to the United States (notably Florida and California) where they thrive in warm temperate climates. (维基百科) Botanically related to oranges, lemons, and limes (family Rutaceae), kumquats are unique in that the entire fruit—skin and flesh—is eaten, maximizing nutrient intake and flavor complexity. The name “kumquat” is believed to be derived from the Cantonese words for “gold” and “orange,” reflecting both its color and cultural symbolism of wealth and good fortune. (Klarity Health Library) There are several widely recognized varieties that differ in size, sweetness, and shape: • Nagami kumquat (Fortunella margarita): The most common commercial variety. It’s oval, with a tart interior balanced by a sweet peel and typically has only a few seeds, making it ideal for fresh snacking. (Nutrition And You.com) • Marumi kumquat (Fortunella japonica): Rounder and sweeter than Nagami, often favored for desserts or fresh eating. (Nutrition And You.com) • Meiwa kumquat (Fortunella crassifolia): Larger and generally sweeter than other types, with extra peel sweetness. It’s widely appreciated in Japan where it’s commonly eaten fresh. (Nutrition And You.com) • Hong Kong kumquat (Fortunella hindsii): Smaller and more primitive, with a higher seed-to-flesh ratio and a more intense citrus flavor used both as an ornamental and culinary fruit. (Nutrition And You.com) Kumquats grow on evergreen shrubs or small trees with glossy dark green leaves that flourish in full sun. They are surprisingly cold-hardy compared to many citrus relatives, tolerating temperatures down to about 18°F (–8°C) in USDA hardiness zones 9–10. (Nutrition And You.com)(维基百科) Harvest is typically in the winter to early spring, offering vibrant citrus flavor at a time of year when fresh fruit is prized for both culinary and nutritional use. Their high essential oil content—rich in limonene and other terpenes—gives kumquats robust aroma and potential antimicrobial properties in extracts. (Nutrition And You.com) While research specifically on kumquat varieties is emerging, their long history of traditional use and increasing cultivation reflects their valued culinary versatility and nutrient-rich profile, enjoyed fresh, candied, preserved, or incorporated in beverages and sauces.
Nutrition Profile: A Detailed Breakdown
Despite their small size, kumquats are nutrient-dense when considered per calorie. A typical single fruit (~19g) contains only about 13 kcal, making them a low-calorie, high-fiber snack relative to energy content. The water content is high (~80%), contributing to hydration and volume without adding many calories. (Nutrition And You.com)(My Food Data) Carbohydrates and Fiber: The carbohydrate content (~3g per fruit) includes about 1.24g of dietary fiber, providing roughly 4% of daily fiber needs per fruit. This fiber is a mix of soluble and insoluble types, which can support slower glucose absorption and improved digestive regularity. High fiber for a citrus fruit distinguishes kumquats from similar-sized citrus such as clementines or mandarins on a per-weight basis. (Nutrition And You.com)(My Food Data) Vitamin C: Kumquats are particularly notable for their vitamin C content, providing ~8.3 mg per fruit (~14% DV per ~100g equivalent). Vitamin C is a potent antioxidant critical for immune function, collagen production, and cellular protection. The edible peel contributes significantly to this content, distinguishing kumquats from other citrus whose peel is typically discarded. (Nutrition And You.com) Minerals: They supply measurable amounts of potassium (~35 mg per fruit), calcium (~11.8 mg), magnesium, and trace minerals like iron (~0.16 mg). Potassium supports fluid balance and cardiovascular health, while calcium and magnesium are essential for bone health and metabolic enzymes. (Nutrition And You.com)(My Food Data) Fats and Protein: Total fat is minimal (~0.16g), with nearly negligible saturated fat, and protein is low (~0.36g per fruit). Despite low protein, the diverse micronutrients make kumquats a nutrient-dense fruit for their calorie content. (Nutrition And You.com)(My Food Data) Phytonutrients and Bioactive Compounds: Beyond classic vitamins and minerals, kumquats contain carotenoids such as lutein, zeaxanthin, and alpha-carotene, which are linked to eye and skin health by quenching free radicals. The peel’s essential oils are rich in limonene and other terpenes, which have been studied for antioxidant and antimicrobial properties in lab settings. (Nutrition And You.com) Comparison to Citrus Peers: On a per 100g basis, kumquats’ vitamin C and fiber content rival or exceed those of tangerines and clementines, and the edible peel adds unique antioxidant capacity that peeled citrus fruits lack. This makes them both nutrient and phytonutrient-dense despite small size and low calorie count.
❤️ Health Benefits
Supports Immune Function
High vitamin C and antioxidant content help maintain white blood cell function and protect cells from oxidative damage.
Evidence: moderateImproves Digestive Health
Dietary fiber facilitates regular bowel movements and supports gut microbiota balance.
Evidence: moderateAntioxidant Protection
Phytonutrients like flavonoids and carotenoids quench free radicals and reduce oxidative stress.
Evidence: preliminary⚖️ Comparisons
Vs. Mandarin Oranges
Mandarins have similar vitamin C but lack an edible peel rich in limonene and carotenoids; kumquats offer more fiber per gram.
🧊 Storage Guide
🏠
Counter
2–3 days
❄️
Fridge
up to 2 weeks (whole fruit)
🧊
Freezer
6 months (puree or frozen slices)
⚠️ Signs of
Spoilage:
- smell: off or fermented odor
- visual: mold, softening skin, shriveling
- texture: mushy or overly soft
- when to discard: visible mold, sour smell, leakage
👥 Special Considerations
elderly
Why: Fiber aids digestion; vitamin C supports immunity.
Recommendation: Good for fiber and immune support.
athletes
Why: Water and micronutrients help recovery.
Recommendation: Good snack for hydration and antioxidants.
children
Why: High flavor and nutrient density are child-friendly.
Recommendation: Suitable as a healthy snack.
pregnancy
Why: Nutrient-rich and low in calories, vitamin C supports maternal needs.
Recommendation: Safe in typical food amounts.
breastfeeding
Why: Vitamin C and hydration support lactation.
Recommendation: Beneficial in moderation.
🔬 Detailed Nutrition Profile (USDA)
Common Portions
1.00 fruit without refuse
(19.00g)
| Nutrient | Amount | Unit |
|---|---|---|
| Water | 80.8500 | g |
| Energy | 71.0000 | kcal |
| Energy | 296.0000 | kJ |
| Protein | 1.8800 | g |
| Total lipid (fat) | 0.8600 | g |
| Ash | 0.5200 | g |
| Carbohydrate, by difference | 15.9000 | g |
| Fiber, total dietary | 6.5000 | g |
| Total Sugars | 9.3600 | g |
| Calcium, Ca | 62.0000 | mg |
| Iron, Fe | 0.8600 | mg |
| Magnesium, Mg | 20.0000 | mg |
| Phosphorus, P | 19.0000 | mg |
| Potassium, K | 186.0000 | mg |
| Sodium, Na | 10.0000 | mg |
| Zinc, Zn | 0.1700 | mg |
| Copper, Cu | 0.0950 | mg |
| Manganese, Mn | 0.1350 | mg |
| Selenium, Se | 0.0000 | µg |
| Vitamin C, total ascorbic acid | 43.9000 | mg |
| Thiamin | 0.0370 | mg |
| Riboflavin | 0.0900 | mg |
| Niacin | 0.4290 | mg |
| Pantothenic acid | 0.2080 | mg |
| Vitamin B-6 | 0.0360 | mg |
| Folate, total | 17.0000 | µg |
| Folic acid | 0.0000 | µg |
| Folate, food | 17.0000 | µg |
| Folate, DFE | 17.0000 | µg |
| Choline, total | 8.4000 | mg |
| Vitamin B-12 | 0.0000 | µg |
| Vitamin B-12, added | 0.0000 | µg |
| Vitamin A, RAE | 15.0000 | µg |
| Retinol | 0.0000 | µg |
| Carotene, beta | 0.0000 | µg |
| Carotene, alpha | 155.0000 | µg |
| Cryptoxanthin, beta | 193.0000 | µg |
| Vitamin A, IU | 290.0000 | IU |
| Lycopene | 0.0000 | µg |
| Lutein + zeaxanthin | 129.0000 | µg |
| Vitamin E (alpha-tocopherol) | 0.1500 | mg |
| Vitamin E, added | 0.0000 | mg |
| Vitamin D (D2 + D3), International Units | 0.0000 | IU |
| Vitamin D (D2 + D3) | 0.0000 | µg |
| Vitamin K (phylloquinone) | 0.0000 | µg |
| Fatty acids, total saturated | 0.1030 | g |
| SFA 4:0 | 0.0000 | g |
| SFA 6:0 | 0.0000 | g |
| SFA 8:0 | 0.0000 | g |
| SFA 10:0 | 0.0000 | g |
| SFA 12:0 | 0.0000 | g |
| SFA 14:0 | 0.0040 | g |
| SFA 16:0 | 0.0900 | g |
| SFA 18:0 | 0.0040 | g |
| Fatty acids, total monounsaturated | 0.1540 | g |
| MUFA 16:1 | 0.0210 | g |
| MUFA 18:1 | 0.1370 | g |
| MUFA 20:1 | 0.0000 | g |
| MUFA 22:1 | 0.0000 | g |
| Fatty acids, total polyunsaturated | 0.1710 | g |
| PUFA 18:2 | 0.1240 | g |
| PUFA 18:3 | 0.0470 | g |
| PUFA 18:4 | 0.0000 | g |
| PUFA 20:4 | 0.0000 | g |
| PUFA 20:5 n-3 (EPA) | 0.0000 | g |
| PUFA 22:5 n-3 (DPA) | 0.0000 | g |
| PUFA 22:6 n-3 (DHA) | 0.0000 | g |
| Fatty acids, total trans | 0.0000 | g |
| Cholesterol | 0.0000 | mg |
| Alcohol, ethyl | 0.0000 | g |
| Caffeine | 0.0000 | mg |
| Theobromine | 0.0000 | mg |
Source: USDA FoodData Central (FDC ID: 168154)
Comments
Please login to leave a comment.
No comments yet. Be the first to share!