Lemon

Overview

Lemon provides vitamin C that enhances non-heme iron absorption and can be used to adjust pH in food preparation (e.g., bean soaking). Lemon also contains citrus flavanones, including eriocitrin (often misspelled in secondary sources) and hesperidin, which are studied for antioxidant and cardiometabolic relevance [1,2].

Key Nutritional Highlights

• Lemon is best understood as a functional modifier food: small amounts can meaningfully change flavour, acidity, and meal context.
• Fibre depends on form: whole lemon (especially pith) contains fibre, but typical juice use contributes negligible fibre; whole blended lemon is a practical exception where fibre rises meaningfully.
• Citrus flavanones (e.g. eriocitrin, hesperidin) are part of lemon’s bioactive identity; exposure depends strongly on whether peel/pith are included [2].

Food Context

Food Matrix & Functional Properties

Common Culinary Forms & Functional Impact

Lemon juice is the dominant culinary form. It mainly contributes acidity, vitamin C, and flavour, but in normal culinary use it contributes negligible fibre.

Lemon zest / peel is a concentrated source of aromatic oils and peel-associated compounds; small quantities can still add meaningful functional value (flavour intensity and a different bioactive profile than juice alone).

Whole blended lemon (less common) retains pith and peel. This meaningfully increases fibre and exposure to peel/pith-associated bioactives compared with juice alone.

Peel / skin compounds: Lemon is not “juice only” in many real-world uses. The skin/zest contains volatile compounds such as limonene and related citrus oils, and flavonoids that can be more concentrated in peel and pith than in juice. Treating lemon purely as juice can under-represent this peel-associated functional layer.

Synergies

• Part of food synergy strategy

Preparation

• Add to iron-rich plant meals to enhance absorption
• Use in bean soaking for pH optimization
• Can be added to tea to reduce iron-binding effects

Recipes

Whole blended lemon recipes can be surprisingly palatable and functionally useful; they’re one of the few realistic culinary contexts where pith/peel fibre and peel-associated bioactives are actually retained (worth developing as a site recipe direction).

5 recipes containing this food

Linguine alle vongole mantecate (Linguine with cockles in a silky emulsified sauce)

Whole-wheat linguine with cockles in a silky emulsified sauce; Italian emulsification technique without cream, supporting taurine, B12, and choline intake.

Neuroeshot (Roe, Lemon, Hot Sauce)

A small savory shot of roe, lemon juice, and fermented hot sauce for concentrated omega-3s and choline.

Rocket Lentil Avocado Midday Salad (Gut-Supporting)

Polyphenol-rich midday salad with quinoa or lentils, vegetables, avocado, and early harvest olive oil

Salmon & Grated Beetroot Toast (with Lemon)

A fast, brain-forward open sandwich combining omega-3 rich salmon, nitrate/polyphenol beetroot, and lemon acidity for a sharp, savoury bite.

Turmeric Lentil Dahl

Turmeric- and ginger-spiced lentil dish rich in fibre, folate, and polyphenols

Note on reference form: The per-100 g nutrition values and any table-derived “substances” reflect the page’s reference food form. If lemon is mainly used as small amounts of juice, real-world fibre and many peel-associated bioactives will be much lower than a “whole fruit / whole portion” mental model.

Nutrient Tables (per 100 g)

Core nutrients

Nutrient	Amount per 100 g	% RDA per 100 g
Energy	29 kcal	—
Protein	1.1 g	—
Total fat	0.3 g	—
Saturated fat	0 g	—
Carbohydrates	9.3 g	—
Sugars	2.5 g	—
Fibre	2.8 g	—

Key vitamins and minerals

Nutrient	Amount per 100 g	% RDA per 100 g
Vitamin C	53 mg	58.9%

Bioactive compounds

Explicitly identified compounds, including individual fatty acids, with a defensible quantity or an explicit qualitative status. Asterisks (*) identify supplementary sources below. Unquantified or trace constituents are not automatically admitted to the Substances list.

Compound / class	Amount per 100 g	Notes
Eriocitrin	Present — quantity not established *	—
Hesperidin	Present — quantity not established *	—

Source notes (supplementary):

• * Eriocitrin: Lemon flavanones include eriocitrin; USDA SR Legacy does not report individual flavanones.
• * Hesperidin: Lemon flavanones include hesperidin; USDA SR Legacy does not report individual flavanones.

Reference intakes: US Dietary Reference Intakes for adults (19–50 years; using the higher of male/female values where they differ).

Data provenance (core / micronutrient panel): USDA FoodData Central, Lemons, raw, without peel, FDC ID 167746, SR Legacy bulk (April 2018), per 100 g edible portion, last checked 2026-08-15

Substances

Substances admitted through a supported nutrition-table row. Not every table row appears here. Cards are not BRS mappings.

3 substances in this food

Eriocitrin

Lemon-associated citrus flavanone studied for antioxidant activity and flavanone metabolism.

Hesperidin

Citrus flavanone glycoside (notably orange, also present in lemon) with cardiometabolic and vascular research interest.

Vitamin C (Ascorbate)

Antioxidant; supports iron absorption; neuronal SVCT2 transport

References

[1] Reports on effect of Garlic and Lemon Juice Mixture on Lipid Profile and Some Cardiovascular Risk Factors in People 30--60 Years Old with Moderate Hyperlipidaemia: A Randomized Clinical Trial. Entezari & Maracy 2016. Effect of garlic and lemon juice mixture on lipid profile and cardiovascular risk factors in moderate hyperlipidaemia

[2] Citrus flavanones (e.g. eriocitrin, hesperidin) are part of lemon’s bioactive identity; exposure depends strongly on whether peel/pith are included. Gimenez-Bastida & Avila-Galvez 2021. Comparative human pharmacokinetics of citrus flavanones eriocitrin and hesperidin