#5 of 96 in Fruit · scored 97/100
Lemon peel is the nutrient-dense outer layer of the lemon fruit, rich in fiber, vitamin C, and bioactive polyphenols. It contains significantly higher concentrations of these compounds than lemon juice alone.
7.6 g net carbs after fiber.
Representative amounts for this food, not measured for this item. Real content varies widely by variety, ripeness and storage.
These are the scored components, not a sum: the published score also reflects normalisation across the catalog, so the parts above will not add to 97.
Lemon peel has been used in traditional medicine for centuries and is increasingly recognized by nutritional science as a functional food with substantial longevity potential. The peel comprises about 10% of the lemon's weight but concentrates beneficial compounds including dietary fiber (10.6g per 100g), vitamin C (129mg), and flavonoids like hesperidin, diosmin, and eriocitrin. These polyphenols are largely absent from the juice and provide antioxidant and anti-inflammatory properties. The peel's high fiber content supports gut health and microbial diversity, critical factors in healthy aging. Additionally, lemon peel contains limonene, a terpene compound studied for potential anti-cancer and hepatoprotective effects. The mineral profile, particularly potassium and calcium, supports bone and cardiovascular health. Lemon peel's bioavailability improves when consumed with healthy fats due to the fat-soluble nature of some polyphenols. The extremely low calorie density (47 kcal/100g) makes it an efficient nutrient source for caloric restriction protocols associated with longevity.
Polyphenols including hesperidin and eriocitrin neutralize free radicals and upregulate endogenous antioxidant enzymes, protecting cellular structures and DNA from age-related damage
High soluble fiber content (10.6g/100g) acts as a prebiotic, selectively feeding beneficial bacteria and supporting production of short-chain fatty acids crucial for intestinal barrier integrity
Flavonoids and potassium work synergistically to improve endothelial function, reduce blood pressure, and lower LDL cholesterol oxidation—a key atherosclerosis driver
Citric acid and malic acid in lemon peel enhance calcium and magnesium bioavailability, while the minerals themselves support bone matrix formation and neuromuscular function
Limonene and polymethoxylated flavonoids exhibit phase I/II enzyme modulation and apoptosis induction in preclinical models, though human evidence remains preliminary
Lemon peel contains no stimulants and provides steady polyphenol delivery. Consuming with meals enhances mineral absorption and fat-soluble compound bioavailability. Morning consumption may provide antioxidant support for daily oxidative stress; evening consumption supports overnight autophagy and circadian antioxidant rhythms.
Fasting-compatible
Lemon peel is compatible with fasting due to negligible calorie content and potential polyphenol-driven autophagy signaling, though absorption of fat-soluble compounds is maximized when consumed with food