Kate Quilton investigates the real science behind the supposed health benefits of superfoods. Kate travels to Japan to drink matcha, a tea said to reduce the risk of coronary heart disease; discovers whether coconut water is really super-hydrating; and finds out if Moroccan argan could challenge olive oil's superfood crown.

Kate travels to Morocco to see if saffron can beat the blues; downs espressos in Naples, to find out if coffee helps the liver; and runs a marathon on Ethiopian teff

Kate finds out if seaweed makes slimmer. Is blue cheese good for our stomach health? And will anyone buy the brand new superfood, Icelandic chork?