Polyphenol Ranking Table

Phenol-Explorer is a comprehensive database developed at INRA (France) covering polyphenol content in 452 foods, drawn from over 1,300 peer-reviewed publications. It is the most complete publicly available database of food polyphenols and is widely used in nutrition research. Values represent mean content from multiple studies; natural variation between food samples, analytical methods, and growing conditions means real-world values will vary. The database was last updated with version 3.6 in 2015.

There is no official daily recommended intake for polyphenols, but research provides useful benchmarks. Studies show that people consuming more than 650 mg of total polyphenols per day have meaningfully lower mortality risk than those consuming under 500 mg. The average person in Western countries gets around 800–900 mg/day from food, primarily from coffee, tea, fruits, and vegetables. Diets rich in whole plant foods — especially colourful fruits, legumes, whole grains, and herbs — can easily exceed 1,000–1,500 mg/day, which is where the strongest health associations appear.

Polyphenols are a large family of plant compounds characterised by multiple phenol rings. Plants produce them primarily as defence mechanisms — against UV radiation, insects, pathogens, and competing plants. For humans consuming plant foods, polyphenols act as antioxidants, anti-inflammatory agents, and signalling molecules in the gut. There are over 8,000 known polyphenolic compounds, grouped into four main classes: flavonoids, phenolic acids, stilbenes, and lignans.

Flavonoids are a subgroup of polyphenols — the largest and most studied one. All flavonoids are polyphenols, but not all polyphenols are flavonoids. The other major polyphenol classes are phenolic acids (such as chlorogenic acid in coffee and green tea), stilbenes (such as resveratrol in grapes), and lignans (in flaxseed, sesame). When you eat a diverse range of plant foods, you get all classes simultaneously rather than just one, which research suggests is more beneficial than focusing on any single compound.

Steaming and microwaving generally preserve polyphenols better than boiling, which leaches water-soluble phenolics into the cooking water. Roasting can actually increase certain polyphenols through Maillard reactions. Fermentation (as in soy products, sourdough, and tea) substantially transforms polyphenol profiles, sometimes creating more bioavailable metabolites. The Phenol-Explorer database includes retention factor data showing how different cooking methods affect specific polyphenol classes in individual foods.