In the eighties, working 14-16 hours days, and playing sports or racing all weekend, I used to occasionally hit the Pizza Inn all you can eat buffet, and have around 20-22 slices of pizza, and a pitcher of iced tea. Of course, I'd been working since 6:00 AM, and would work until 8:00.
Of course I could also drink copious quantities of alcoholic beverages all weekend as well. We had a company softball team that we regularly made at least mid state playoffs, so that's one reason I stayed in shape, I practiced 2-3 times a week minimum, and we played 3-5 games a week. I only needed about 5-6 hours of sleep weekdays, less on weekends.
I paid for it in my forties and fifties, struggling to keep my weight down, and stay in decent shape.