Interesting - The few European lads I know well enough to call friends all eat pretty much the average climbing bum's diet. Shared communal meals in the evening, plenty of bread at the crag and a steady flow of alcohol. Seb isn't any different and certainly enjoys his food and drink, maybe that's the reason he can put two full days together and train after? Contrast that to time I've spent with wads here who often seem obsessed with food, as they are often restricting it for a project.
I spent a bit of time with Gasper Pinter and over dinner one night we chatted about anorexia in climbing - he saw it as a big problem in the competition scene, which he used to be part of. When he ticked his first 9a a month or so later, he drank beer and whisky every night after dinner (with a guilty conscience) and he had a good appetite, whatever was leftovers, he would have!