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I spotted the corrected 8-10k figure with a better google search.
My point was that your sporting activity can require huge calorie intake.A pretty well known way of adding calories (for bodybuilders anyway) is 1 gallon of full fat milk on top of your normal food each day, for approx. 2400 calories.
Being mildly lactose intolerant that makes me somewhat queazy just thinking about it.
"The U.S. Olympic swimmer told ESPN that he eats roughly 8,000-10,000 calories a day"
https://www.webmd.com/diet/news/20080813/the-olympic-diet-of-michael-phelps
So that's 4000 cal that's just disappeared into the internet...
"Bonci estimates that to support his 6-foot-4-inch, approximately 190-pound frame, Phelps' rigorous training regime requires roughly 1,000 calories per hour while he is racing or training; she suggests he probably eats closer to 6,000 calories per day."
As someone who has actually measured and consumed this amount of calories I'm calling bullshit on this one. Maybe one day he did but there's no fucking way it's regular and almost certainly not the foods he says he eats. For me to consume ~13000 calories I was awake and racing a bike for 24hr and eating almost all carbohydrates in mostly easily digestible liquid, gel (and some bars) form.
If you add fat and protein into that, as he claims, digestion slows right down and it would be heading towards spew time.