Blackberries (Rubus fruticosus) are aggregate stone-seeded fruits formed from dozens of glistening drupelets clustered around a fleshy, edible receptacle, celebrated for their deep black-purple color, tart-sweet complexity, and dense nutritional value. When evaluating blackberry nutritional value per 100g, raw fresh blackberries provide approximately 43 calories, 9.6 grams of total carbohydrates, and over 88% water content, making them an outstanding low-energy-density, high-volume whole food for fat-loss programs, ketogenic protocols, and clean eating lifestyles. For a standard dietary portion—regularly measured as 1 cup of raw blackberries (approx. 144 grams)—the caloric yield equals roughly 62 calories and 13.8 grams of total carbohydrates.

Elite Dietary Fiber Ratio, Low Net Carbs & Glycemic Stability

Blackberries boast one of the highest fiber concentrations among all culinary fruits. A standard 1-cup serving delivers an exceptional 7.6 grams of dietary fiber counterbalanced by only 7.0 grams of naturally occurring sugars—composed of fructose and glucose with negligible sucrose. This unique composition results in a net carbohydrate count of just 6.2 grams per cup. The seed drupelets contribute insoluble fiber that accelerates gastrointestinal motility and bulks stool, while the surrounding pulp provides soluble pectin that dissolves into a viscous gel within the digestive tract. This gel slows enzymatic carbohydrate breakdown, yielding an exceptionally low glycemic index (GI ~25 to 32) and a negligible glycemic load (~3 per cup), preventing blood sugar and insulin spikes.

Exceptional Micronutrients: Vitamin C, Vitamin K & Manganese

Blackberries are rich in bioavailable vitamins and vital metabolic trace minerals:

• Vitamin C (Ascorbic Acid): Delivering 21.0 mg per 100g and over 30.2 mg per cup, a single serving fulfills roughly 34% to 35% of the recommended daily value (DV). Vitamin C serves as a principal endogenous antioxidant, enhancing white blood cell phagocytic activity, neutralizing lipid radicals, and driving collagen biosynthesis for skin and vascular wall strength.

• Vitamin K (Phylloquinone): Supplying roughly 28.5 µg per cup (nearly 24% of the daily value), blackberries are one of the most concentrated fruit sources of Vitamin K, an essential cofactor for blood clotting factors and osteocalcin carboxylation in bone mineral retention.

• Manganese: One cup provides 0.93 mg of manganese (about 40% of the daily value), an essential trace element that activates mitochondrial manganese-superoxide dismutase (Mn-SOD) to protect cellular membranes against oxidative damage while aiding amino acid and lipid metabolism.

• Vitamin E & Potassium: Blackberries supply 1.68 mg of bioavailable Vitamin E (alpha-tocopherol) per cup, along with 233 mg of potassium to aid vascular smooth muscle tone and intracellular fluid balance.

Anthocyanins, Ellagitannins & Oral Health

The midnight-purple pigmentation of blackberries is driven by high levels of cyanidin-3-glucoside, the primary anthocyanin in the fruit. Along with ellagitannins and gallic acid, these polyphenols counteract systemic vascular inflammation, reduce LDL cholesterol oxidation, and protect brain neurons from oxidative stress. Additionally, clinical research indicates that blackberry extract exhibits targeted antibacterial and anti-inflammatory activity against periodontal oral pathogens, supporting oral health alongside systemic metabolic vitality.