I Don't Know How Michael Phelps Does It

I'm not comparing myself to Michael Phelps as an athlete by any means. What I'm wondering about is the 12000 calories he eats (ate?) per day while training and competing. I took today off, and found myself eating huge meals today after a huge dinner last night. All in all, I think I've had about 5000-6000 calories over the last 24 hours. Most of it has been carbs in several different forms to refuel after 23 miles the last couple of days, and to load up for my long run this weekend. One of these marathon training days this year, I'm going to try to consume 12000 calories in one day and blog about how it affects me.