See here what professional cyclists need to eat in order to perform at the best level they can. Here is a video with the Saxo-Tinkoff chef showing us what he prepares for the cyclists. He also describes what types of food they eat and how much of it they eat. Professional cyclists typically burn around 9000 calories a day during any big bicycle race. In order for them to eat all the nutrients and calories they need, the cyclists eat about 1kg of food for dinner.