Polyphenols in Coffee
Coffee is one of the richest dietary sources of polyphenols, primarily chlorogenic acids (CGAs), which represent 5-12% of dry green bean weight. CGAs are partly degraded during roasting - light roasts retain the most (up to 200 mg per cup), dark roasts the least (~50 mg). Other polyphenols include caffeic acid, ferulic acid, and melanoidins (Maillard reaction products). Regular coffee consumption (3-5 cups/day) is associated with reduced risk of type 2 diabetes, Parkinson's disease, and liver cirrhosis.
Background & Context
Les polyphénols du café (coffee polyphenols) are a group of plant-derived bioactive compounds present in coffee in exceptional quantities — making coffee one of the highest dietary sources of polyphenols in the Western diet. The primary polyphenols in coffee are chlorogenic acids (CGAs) — esters formed between quinic acid and hydroxycinnamic acids (caffeic, ferulic, p-coumaric acid). A 200ml cup of filter coffee contains 250–550mg of CGAs, while an espresso shot contains 70–200mg. Coffee also contains smaller amounts of flavonoids (quercetin, kaempferol), lignans, and stilbenes. Roasting degrades CGAs progressively: a light-roasted coffee retains 60–80% of the green bean's CGA content; a dark roast may retain only 20–30%. The European EPIC study — involving over 500,000 participants across 10 countries — linked habitual coffee consumption to reduced risk of Type 2 diabetes, Parkinson's disease, and liver fibrosis, effects partly attributed to CGA antioxidant and anti-inflammatory activity.
Practical Use
For café operators and health-conscious consumers, coffee's polyphenol content is an increasingly relevant menu and marketing consideration. Light-roasted filter coffee — typically positioned for flavour — simultaneously delivers the highest polyphenol dose per cup. Cold brew, while lower in acidity, also extracts fewer CGAs than hot methods at equivalent concentration due to lower water temperature reducing CGA solubility. Decaffeinated specialty coffee retains most of its polyphenol content, making it a relevant recommendation for caffeine-sensitive customers who want coffee's health benefits. When communicating coffee's polyphenol benefits, the most credible claim is "one of the richest dietary sources of antioxidants in the European diet" — supported by the 2019 EFSA dietary exposure assessment, which identified coffee as the primary polyphenol source for European adults.
Related Terms
Related terms: Coffee polyphenols (EN), Chlorogenic acid, Light roast, Dark roast, Caffeine metabolism.