Depending on their gender and age, a person needs anywhere from 2,000 to 2,600 calories every day. Brian Shaw, who is 40 years old, is a healthy, busy adult, but even 2,600 calories won't be enough for him.
In fact, that isn't even enough calories for a single meal most of the time. Shaw's "active" lifestyle includes participating in top-level strongman competitions.
He has won the biggest of these four times, the official World's Strongest Man competition. Even more often than that, he has finished in the top three of that race.