I. Vegetables and root vegetables

I. 24 Celery

A quiet ally of blood pressure – apigenin flavonoid, phthalide compounds, and moderate nitrate in one crunchy stalk.

Latin: Apium graveolens L. (Apiaceae)FODMAP: 🟡 moderate (stalk 10 g/serving low; celeriac > 75 g high due to mannitol)Evidence: ★ ★ (small human interventions – blood pressure; preclinical apigenin and phthalide data)Microbiota: apigenin flavonoid → Lactobacillus, Bacteroides modulator; mannitol mild osmotic + fermentable

Celery in 1 minute

What does it provide? Apigenin (flavone – ≈ 19 mg/100 g, one of the highest apigenin sources), 3-n-butylphthalide (3nB, aroma component and vasodilator) – the latter at about 6–28 mg/100 g fresh stalk. Vitamin K1 (≈ 29 μg/100 g), potassium (≈ 260 mg/100 g), and moderate inorganic nitrate (≈ 250 mg/kg) [2775].

How much? Fresh as salad or snack 30–80 g stalk/serving (≈ 2–4 stalks), in soup 100–150 g celeriac/serving, weekly 3–5×. In preclinical (animal) lipid studies, celery extract reduced serum cholesterol and triglycerides (Tsi 1995 Planta Med, rat) [2773]; human antihypertensive evidence is weak to moderate.

When to avoid? Celery allergy (Apiaceae cross-reaction: carrot, parsley, mugwort – "birch–mugwort–celery syndrome"), psoralen photodermatosis (celery's psoralen content is phototoxic, especially from diseased stalk), warfarin at long-term dose in large amounts (K1 + coumarin synergy), pregnancy in large amounts (apiol theoretical uterotonic effect), active IBS flare with celeriac (FODMAP-high mannitol).

📜 Historical Overview

Celery originates from the marshy shores of the Mediterranean and Western Asia, where its wild form – bitter and aromatic – was noticed even by ancient Egyptians: a wreath of celery leaves was found in Tutankhamun's burial chamber, dated around the 12th century BCE. Greeks knew it as selinon and considered it a mourning plant of the dead – in Homer's Iliad, Patroclus's horse grazes in a celery-decorated meadow. The Romans used it as both medicinal herb and digestive stimulant. The domesticated, swollen-stalked forms appeared in the 16th–17th century in Italy; the bulbous (celeriac) variety was matured to its present thickness by French horticulture. (Britannica)

Scientific Background

Celery offers three well-documented bioactive families. (1) Flavones: apigenin and its glycoside, apiin (≈ 19 mg/100 g apigenin equivalent) – apigenin per the Shukla & Gupta (2010) Pharm Res review is a broad-spectrum antioxidant, anti-inflammatory, and anxiolytic molecule that also acts on the GABA-A receptor [2772] [2774]. Its clinical relevance is partial: bioavailability is low (≈ 5%), but the colonic microbiota deglycosylates apigenin and converts it into kaempferol-like metabolites.

(2) Phthalides: 3-n-butylphthalide (3nB) and sedanolide compounds give celery its characteristic aroma, and in preclinical studies (in vitro and animal lipid models – Tsi 1995 Planta Med, high-fat-fed rat) they showed systolic blood-pressure-lowering and vascular smooth muscle-relaxing effects [2773]. The proposed mechanism: calcium channel modulation + sympathetic tone reduction. Clinical evidence is still weak-to-moderate, but the pharmacological pathway is validated.

(3) Mannitol and fiber: celeriac has significant mannitol content (FODMAP-high, osmotically active polyol), which triggers bloating and a mild laxative effect in sensitive individuals, but is a prebiotic-equivalent substrate for healthy microbiomes (Bifidobacterium fermentation) [2776].

Celery is high in water (≈ 95%), low in calories (≈ 16 kcal/100 g) – the "negative-calorie food" myth doesn't hold, but it is a carbohydrate-sparse carbohydrate source.

✅ Combine with

+ Olive oil / peanut butter snack: K1 and β-carotene absorption needs fat; the classic "peanut butter on celery stalk" is not just a kids' snack but a fat-vitamin synergy.
+ Onion, garlic: the coumarin and quercetin matrix is cardiovascularly synergistic.
+ Carrot, parsley: Apiaceae-related vegetables for polyphenol pool expansion (mixed soup, mirepoix).
+ Lemon juice + fish dish: apiol and phthalides stabilize in acidic medium, and the fish omega-3 + celery polyphenol matrix is anti-inflammatory.
+ Salad greens + walnut: Mediterranean pattern, ALA + apigenin synergy.

🚫 Avoid combining with

Antihypertensive drug + large celery juice amount: additive hypotension risk. Culinary amounts are safe, therapeutic-dose celery juice (> 250 ml/day) requires supervision.
Warfarin at long-term dose: K1 + coumarin together affect INR – stable weekly pattern needed.
Levothyroxine simultaneous intake: fiber may reduce hormone absorption – keep > 2 hours apart.

⚠️ When to avoid – condition-specific

Celery allergy (Apiaceae): strict avoidance, anaphylaxis risk. In birch–mugwort–celery syndrome there are cross-reactions with stone fruits and spices.
Psoralen photodermatosis: diseased or fungus-infected celery's psoralen content is phototoxic – healthy, fresh celery is safe.
IBS flare: celeriac is to be avoided due to high mannitol – stalk is low FODMAP, tolerable.
Kidney stones, CKD 3–5: moderate potassium and oxalate content – dose control.
Pregnancy in large amounts: apiol theoretical uterotonic effect – culinary amounts are safe, therapeutic celery oil should be avoided.

❌ Myths and their refutation

"Celery is negative-calorie – it burns as much energy in digestion as it contains."Myth. Celery's thermic effect (TEF) is about 5–10%, meaning of 16 kcal, about 1–2 kcal goes to digestion – net calorie intake remains. It is true that thanks to high water and fiber content, it fills the stomach well, with low glycemic index.

"Celery juice cures stomach disease in a few days."Partly myth. The 2017 "Medical Medium" Anthony William trend is not clinically validated. Celery's apigenin and phthalides have real anti-inflammatory activity, but there is no evidence for them alone curing peptic ulcer or IBD. A moderate blood-pressure-lowering effect is documented only at the preclinical level.

"Celery stalks are 'empty' calories – there's nothing in them."Mistaken. Vitamin K1 (≈ 29 μg/100 g – a significant source), apigenin, phthalides, potassium, and fiber are all present.

References

[2772] Shukla S, Gupta S. Apigenin: a promising molecule for cancer prevention. Pharmaceutical Research. 2010. Link

Review of apigenin, one of celery's main flavones, a broad-spectrum antioxidant, anti-inflammatory, and anxiolytic molecule that also acts on the GABA-A receptor. It summarizes the compound's low bioavailability and potential health roles.

[2773] Tsi D, Das NP, Tan BKH. Effects of aqueous celery (Apium graveolens) extract on lipid parameters of rats fed a high fat diet. Planta Medica. 1995. Link

Preclinical (rat) study showing that aqueous celery extract reduced serum cholesterol and triglycerides on a high-fat diet. Preclinical support for the lipid and blood-pressure effects of celery's phthalide compounds.

[2774] Kooti W, Daraei N. A review of the antioxidant activity of celery (Apium graveolens L.). Journal of Evidence-Based Complementary and Alternative Medicine. 2017. Link

Review of the antioxidant activity of celery (Apium graveolens). It summarizes the antioxidant and anti-inflammatory effects of the flavone (apigenin), phthalide, and polyphenol fractions, along with the relevant preclinical evidence.

[2775] . Celery, raw. USDA FoodData Central. 2019. Link

Entry from the USDA FoodData Central nutrition database for raw celery, documenting macro- and micronutrient composition (including vitamin K1, potassium, water content). A reference source for the nutrient values reported in the chapter.

[2776] . Celery — FODMAP serving guidance. Monash University FODMAP. 2023. Link

Classification from the Monash University FODMAP database rating celery stalk as low FODMAP in small servings but celeriac as high FODMAP due to its mannitol content. It provides a practical basis for IBS-friendly portioning.