British cyclist Sir Chris Hoy, relishes up to 6,000 calories a day, beginning with a breakfast of cereal, banana and honey, a fruit smoothie, orange juice, a protein shake and a coffee. He has won three gold medals at the Beijing Olympic Games in 2008.
Hoy also drinks up to six litres of water a day, and trains for 25 to 35 hours a week.
A typical day for Hoy might include two hours in the gym, a one-hour recovery ride on the road, then three hours at the velodrome.
Hoy has also been nicknamed Golden Thighs because of his 27in legs, and he hopes that might hopefully power him to yet another gold during the London Olympics.