Bell peppers (Capsicum annuum), widely referred to as sweet peppers or capsicum, are glossy, bell-shaped fruits of the Solanaceae family culinarily categorized as crisp salad and stir-fry vegetables. Unlike their pungent chili counterparts, bell peppers carry a recessive gene that completely suppresses capsaicin production, resulting in a sweet, crisp, and refreshing profile devoid of heat. When analyzing bell pepper nutritional value per 100g (raw red variety), fresh bell peppers supply roughly 31 calories, 6.0 grams of total carbohydrates, and over 92% water content, making them a premier low-calorie, high-volume whole food for ketogenic diets, fat-loss protocols, and clean eating lifestyles. For a standard dietary serving—regularly logged as one medium whole bell pepper (approx. 119 grams edible portion)—the nutrient yield equals approximately 37 calories and 7.2 grams of total carbohydrates.

Carbohydrate Breakdown, Natural Sugars & Glycemic Response

The energy in fresh bell peppers is driven by naturally occurring simple sugars balanced by functional plant fibers. A single medium red bell pepper contains approximately 5.0 grams of natural sugars—composed of a natural split of fructose and glucose with virtually no sucrose—alongside 2.5 grams of dietary fiber (2.1g per 100g). This yields a remarkably low net carbohydrate count of just 4.7 grams per whole pepper. The structural fiber matrix consists of insoluble cellulose and hemicellulose in the glossy exocarp and pericarp walls, supporting digestive transit and gut motility. With an ultra-low glycemic index (GI ~15) and an essentially negligible glycemic load (~1 per whole pepper), raw and cooked capsicum can be consumed generously without impacting postprandial blood glucose or insulin levels.

Industry-Leading Vitamin C Super-Potency & Provitamin A

Bell peppers consistently outrank citrus fruits as one of the richest dietary sources of ascorbic acid in the human diet:

• Vitamin C Superiority: Delivering an astonishing 127.7 mg of Vitamin C per 100g (and over 152 mg in a single medium red pepper), just one whole capsicum supplies 169% to 200% of the recommended daily value (DV)—more than double the Vitamin C found in a typical orange. Ascorbic acid is a critical antioxidant that defends against lipid peroxidation, drives enzymatic collagen synthesis for joint cartilage and skin firmness, accelerates wound healing, and multiplies non-heme iron bioabsorption up to threefold.

• Provitamin A Carotenoids & Capsanthin: Fully ripened red bell peppers are packed with capsanthin (the primary red pigment), beta-carotene, and violaxanthin. A medium red pepper supplies roughly 187 µg RAE of Vitamin A (over 1,900 µg of beta-carotene), protecting photoreceptor cells in the retina, preserving ocular moisture, and strengthening mucosal barrier integrity.

• Vitamin B6 (Pyridoxine) & Folate (B9): Supplying 0.35 mg of Vitamin B6 (nearly 21% of the daily value) and 55 µg of folate per pepper, capsicum assists in cellular transamination reactions, red blood cell synthesis, and normal homocysteine clearance.

Lutein, Zeaxanthin & Vascular Endothelial Support

In addition to carotenoids in red varieties, green bell peppers (harvested earlier in maturation) and yellow varieties provide high concentrations of the macular pigments lutein and zeaxanthin. These xanthophylls concentrate directly within the human macula lutea to filter phototoxic blue wavelengths and protect retinal capillaries from photo-oxidative degradation. Furthermore, flavonoids such as quercetin and luteolin present throughout capsicum tissue exhibit documented anti-inflammatory actions that preserve arterial flexibility and support healthy blood pressure regulation.