While we're on the subject of roots and tubers it seems that yams are one of Usain Bolt's favourite foods.
Trelawny Yam Festival - All About Yams.
KINGSTON, Jamaica (Reuters) - Usain Bolt streaked to 100 metres Olympic gold at the Beijing Olympics on Saturday thanks to yam power, his father said.
Wellesley Bolt said his son was partial to the vegetable grown in the north-western area of Jamaica where the sprinter was born.
"It is definitely the Trelawny yam," Bolt senior told Reuters seconds after his son smashed the world record on the way to landing the biggest gold medal in sport.