what are polyphenols?
polyphenols are a large and diverse group of naturally occurring plant compounds, found in varying amounts across fruits, vegetables, seeds, wholegrains, tea and coffee. they're responsible for many of the colours, flavours and astringent qualities found in plant foods, and lignans, discussed elsewhere in this series, are actually one specific category within the broader polyphenol family.
their role in the body
polyphenols are widely studied for their antioxidant properties, meaning they may help support the body's natural defences against oxidative stress, alongside vitamins and minerals like vitamin e and selenium. research into polyphenols is a genuinely active and evolving area of nutrition science, and while there's considerable interest in their potential role in general wellbeing, it's important to be cautious about overstating what individual foods rich in polyphenols can do, since much of the research is at an early or observational stage rather than firmly established. a varied diet naturally rich in different plant foods is generally considered the most sensible way to include a broad range of polyphenols, rather than focusing on any single compound or supplement.
good dietary sources
- seeds, including flaxseed and sesame seeds
- berries and other colourful fruits
- vegetables, particularly dark leafy greens and red onions
- tea, coffee and dark chocolate, enjoyed in moderation
things to consider
polyphenols from food are generally considered safe as part of a normal, varied diet, but concentrated polyphenol supplements are a different matter, and their long term safety and effectiveness at high doses is less well established, so it's sensible to be cautious with them and to seek advice from a healthcare professional before using concentrated extracts, particularly for anyone who is pregnant, breastfeeding, or taking medication, since some polyphenols can interact with how certain drugs are processed by the body.
the takeaway
polyphenols are a fascinating and wide ranging group of plant compounds with a genuine role in supporting the body's antioxidant defences, and eating a varied, plant rich diet that includes seeds, fruit, vegetables and wholegrains is the most balanced way to benefit from them.