Have there been any studies on the differences in behavior of apes fed high-calorie diets? (Presumably non-interventionist studies, of e.g. apes that scavenge from urban areas encroaching into their habitats.)
For that matter, how about the "city" monkeys of Lopburi, who eat human food (either from human offerings, or by stealing it)? Anyone looked into their sleep cycles?
I'm approaching the limit of my simian expertise. Those are interesting questions. I know captive apes outside laboratory conditions (zoo animals, pets, entertainment) are prone to diabetes, heart disease, and other modern human medical plagues, but I don't know their sleep habits.
For that matter, how about the "city" monkeys of Lopburi, who eat human food (either from human offerings, or by stealing it)? Anyone looked into their sleep cycles?