Kimmage in Rough Ride also talked about riders secretly smuggling food and eating it like naughty kids smoking behind the bikesheds, away from the eye of the team director.
Also, in another book, I recall Greg LeMond finding the strict dietary restrictions of French teams completely weird, ice cream was good (or possibly bad) cheese was bad (or possibly good) ... and so on. A lot of it made no sense whatsoever.
Tyler Hamilton quoted some doctor or other (maybe Ferrari) saying that to succeed in GTs a rider needed: "To be very very fit; to be very very skinny; to have a high haematocrit." We all know how they achieved the third of these, and the first comes from genetics/hard work.
I'll see if I can look up these quotes.