It doesn’t seem long ago that these wallet-busting chewy Himalayan berries were in the headlines, with stick-thin celebrities such as Kate Moss, Liz Hurley and Madonna endorsing their power to destroy cellulite and save the world. Goji berries, also known as wolfberries, are grown in east Asia and can also be consumed as a drink; they're similar in size and texture to the humble raisin, are deep red in colour, and taste like a cross between cranberries and cherries. Rich in nutrients, this uninspiring-looking fruit is (allegedly) what kept Li Qing Yuen – the oldest person ever to have lived – alive for 252 years.