By Fleur Borrelli BSc Nuit med,BA Hons Nutritionist at The Putney Clinic of Physical Therapy Berries contain plant chemicals known as polyphenols. These are found in vegetables and fruit as well as in coffee and cocoa. Recently one category of polyphenols (anthocyanins) found in strawberries, raspberries, and blueberries have attracted attention for enhancing cognitive function in the elderly. Whist it is still early days for any conclusive evidence, there is no harm in eating a handful per day,fresh or frozen.