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 | 17 kcal | — |
| Protein | 0.5 g | — |
| Total fat | 0.1 g | — |
| Saturated fat | 0 g | — |
| Carbohydrates | 5.7 g | — |
| Fibre | 0.7 g | — |
Key micronutrients
| Nutrient | Amount per 100 g | % RDA per 100 g |
|---|---|---|
| Iron | 0.1 mg | 0.3% |
| Zinc | 0.2 mg | 2.1% |
| Magnesium | 6 mg | 1.4% |
| Calcium | 9 mg | 0.9% |
| Potassium | 109 mg | 3.2% |
| Folate | 11 µg | 2.8% |
| Vitamin B6 | 0 mg | 2.2% |
Bioactive compounds
Values below are often from specialist compositional databases or literature, not the standard USDA panel. Asterisks (*) refer to source notes at the bottom of this section.
| Compound / class | Amount per 100 g | Notes |
|---|---|---|
| ALA | 6 mg | — |
Note: Bioactive-compound values vary substantially by cultivar, species, cocoa or oil percentage, processing, and brand formulation. Show quantitative values only where a defensible source exists; otherwise prefer qualitative presence statements or ranges in source notes.
Substances
Substances in this food: editorial (Overview / literature) plus analytical (nutrition table).
11 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
Iron
Oxygen transport; dopamine synthesis (tyrosine hydroxylase cofactor)
Zinc
Cofactor in neurotransmission and antioxidant enzymes; dopamine modulation
Magnesium
Enzymatic cofactor (>300 reactions); neurotransmitters; mitochondria; redox balance
Calcium
Bone health; neurotransmission; interacts with vitamin D and K2
Potassium
Electrolyte for nerve transmission, muscle function, and blood pressure regulation
Vitamin B9 (Folate; 5-MTHF)
One-carbon metabolism; methylation; homocysteine recycling
Vitamin B6 (Pyridoxine → PLP)
PLP cofactor for neurotransmitter synthesis; relies on brain PDXK activation
ALA (Alpha-Linolenic Acid)
Essential omega-3 precursor; limited conversion to DHA/EPA
References
[1] Effect of garlic and lemon juice mixture on lipid profile and cardiovascular risk factors in moderate hyperlipidaemia Entezari et al. 2016
[2] Comparative human pharmacokinetics of citrus flavanones eriocitrin and hesperidin Gimenez-Bastida et al. 2021