Jose Francisco Mari, 48, poses for a portrait on 'chufas' (tiger nuts) being dried at his house on January 18, 2016 in Valencia, Spain. According to the Valencia's Tiger Nut Regulatory Council, the cultivation of 'chufa' (tiger nuts) is living its golden years, in part due to its popularity fuelled by followers of the fashionable Paleo Diet. Some celebrities such as Miley Cyrus, Uma Thurman and Matthew McConaughey are known to be users of the Paleo Diet. An Oxford study published in January ...