Black Grapes
Nutrition Information
| Nutrient / Component | Per 100 g | Per 1 Cup (151 g) |
|---|---|---|
| Energy (Calories) | 69 kcal | 104 kcal |
| Water | 80.5 g | 121.6 g |
| Protein | 0.72 g | 1.09 g |
| Total Fat | 0.16 g | 0.24 g |
| Total Carbohydrates | 18.1 g | 27.3 g |
| Dietary Fiber | 0.9 g | 1.4 g |
| Total Sugars | 15.5 g | 23.4 g |
| — Glucose | 7.2 g | 10.9 g |
| — Fructose | 7.4 g | 11.2 g |
| — Sucrose | 0.15 g | 0.23 g |
| Potassium | 191 mg | 288.4 mg |
| Calcium | 10 mg | 15.1 mg |
| Magnesium | 7 mg | 10.6 mg |
| Phosphorus | 20 mg | 30.2 mg |
| Sodium | 2 mg | 3.0 mg |
| Iron | 0.36 mg | 0.54 mg |
| Vitamin C | 3.2 mg | 4.8 mg |
| Vitamin K | 14.6 µg | 22.0 µg |
| Copper | 0.13 mg | 0.19 mg |
Description
Black grapes (including popular varieties like Autumn Royal, Concord, and Sable) are celebrated globally for their intense, sweet-tart flavor and deep purple-black pigmentation. When analyzing black grapes nutritional value per 100g, fresh seedless black grapes provide roughly 69 calories, 18.1 grams of total carbohydrates, and over 80% water content, functioning as a hydrating, energy-dense natural snack. For a standard dietary portion—measured as 1 cup of whole grapes (approx. 151 grams)—the energy profile equates to 104 calories and 27.3 grams of total carbohydrates.
Carbohydrate Breakdown, Natural Sugars & Glycemic Response
The caloric energy in black grapes originates almost exclusively from simple, bioavailable monosaccharides. A 1-cup serving delivers roughly 23.4 grams of total sugars, distributed evenly between glucose and fructose, with virtually no sucrose. This sugar matrix is accompanied by 1.4 grams of dietary fiber, primarily located within the thin outer skins. Despite their high natural sweetness, black grapes maintain a low-to-moderate glycemic index (GI ~45 to 53), buffered partly by their rich polyphenolic matrix, which helps modulate intestinal carbohydrate digestion and post-meal glucose absorption.
High Anthocyanin, Resveratrol & Antioxidant Density
The defining characteristic that sets black grapes apart from green or white varieties is their exceptional phytochemical profile concentrated within the dark grape skins:
Anthocyanins & Proanthocyanidins: The intense purple-black color reflects high levels of anthocyanins (such as malvidin, peonidin, and petunidin). These bioflavonoids demonstrate potent free-radical scavenging activity, reduce systemic vascular inflammation, and help attenuate LDL cholesterol oxidation.
Resveratrol: Concentrated heavily in dark grape skins, resveratrol is a natural stilbenoid widely studied for its cardioprotective benefits, ability to stimulate endothelial nitric oxide production for blood vessel dilation, and potential anti-aging cellular pathways.
Quercetin & Flavonols: These bioactive molecules work synergistically with grape polyphenols to support immune response and cardiovascular arterial elasticity.
Essential Micronutrients: Vitamins, Electrolytes & Trace Minerals
In addition to their specialized polyphenols, black grapes contribute essential daily micronutrients:
Vitamin K (Phylloquinone): Providing 14.6 µg per 100g (and approximately 22 µg per cup), black grapes supply roughly 18% of the daily value (DV), acting as an essential cofactor for blood coagulation proteins and osteocalcin synthesis in bone tissue.
Potassium & Electrolyte Homeostasis: Delivering 191 mg of potassium per 100g (around 288 mg per cup), black grapes help counterbalance dietary sodium intake, regulate fluid distribution, and support smooth muscle contractions.
Vitamin C & Copper: Supplying modest amounts of ascorbic acid (approx. 4.8 mg per cup) along with trace copper, black grapes support iron metabolism, connective tissue repair, and immune defenses.
