What athlete consumes the most calories?
                                
                                
                                •
                                
                                
                        
                                    
                                    4 min read                                
                            
                                During his peak training for the 2008 Olympics, swimmer Michael Phelps reportedly consumed up to 10,000 calories a day to fuel his rigorous schedule of six hours of training. This extraordinary intake is common among ultra-endurance athletes who push their bodies to the absolute limit.