Question: how many calories should i eat while training for a triathlon?
Answer: An endurance athlete's caloric needs are high, evidenced by Michael Phelps reported pasta-and-pizza diet [source: ESPN]. An average 160-pound human being needs between 2,000 and 3,000 calories per day. An average 160-pound triathlete needs between 3,000 and 4,000 calories per day [source: TNO].