Disregarding calorie ratios and veganism, I can attest that ANY cooked food leaves me hungrier than raw animal foods.
I believe the body will naturally crave any kind of food until the limiting factor of said food is met, whether that limiting factor be calories, minerals, vitamins, or their co-factors. I could not eat enough cooked food, even if I was full - I'd want more and it'd always screw up my digestive system nonetheless make me even more fat!
Craig
I quite agree. Like so many people on previous cooked-food diets, I would find that I would be able to eat vast amounts of cooked-foods and never feel sated - this was particularly bad with highly processed carbs like crisps(I believe you Americans call them chips, I think?) where I would get massive feelings of hunger(or rather cravings) no matter how much I ate of them. The eating of cooked and processed foods is , of course, one major reason(other than lack of exercise) why people in the West are so obese, as they always feel hungry(no doubt because of cravings for nutrients missing in their cooked-diet) - and the higher the cooking-temperature and the higher the level of processing, the worse the obesity-rate becomes.
Re energy-levels:- I always feel sluggish after eating any cooked-foods(only time I felt sluggish while eating 100% raw was when I occasionally did something wrong with my diet such as including raw dairy (to which I'm allergic), not eating eating any organ-meats or something equally stupid - otherwise I have no issues) - while I agree that many turn back to cooked-foods, in most cases this is due to social reasons as raw-meat-eating is so frowned upon in today's society that it becomes extremely difficult to do 100% raw - though there are actually quite a number of families doing 100% raw (Primal Diet) in the States since the Primal Diet started in 1997, despite this huge pressure.
Re cooked-food requiring less time to digest:- Actually, cooked food takes much longer in the stomach to digest than raw food, and since cooked food has fewer calories than raw, it provides less energy. There's a study from the University of California, mentioned in numerous sources, that showed that the more bread was cooked, the longer it stayed in the stomach:-
http://www.healthwalk.com/?TabId=521Re comment that one doesn't need to spend so much time on food when eating cooked food than with raw:- This is, of course, nonsensical since cooking involves a huge amount of time wasted re setting up hearths/spits etc. and then waiting for the food to be heated up, unlike with raw (palaeo) foods. And the claim re chimpanzees is not valid as chimpanzees, living off mainly things like leaves and plants and fruits(only 7% animal food in the form of monkeys and termites) need much longer to digest their foods to rid the veg of its antinutrients than humans would on a raw-meat-/raw-fruit-based(and therefore antinutrient-free) diet - interestingly, I've heard that gorillas depend much more than chimpanzees on relatively indigestible plant-food like leaves, so have to spend much more time chewing and digesting than chimps.
Wrangham has made some incredibly foolish comments re this area, such as his claim(
http://www.sciam.com/article.cfm?id=cooking-up-bigger-brains )
that Homo Erectus(and by implication raw foodists) would have to chew raw meat for 5 to 6(!) hours a day just in order to get enough calories to survive or that Homo Erectus would need c.11 to 12 pounds of raw veg/fruit a day(or 6 pounds of raw meats and raw plants a day) just in order to survive - this is ridiculous as plenty of Raw-Animal-Foodists, myself included, have been able to survive with ease on much, much less than that each day. As long as Wrangham cites such absurd figures, he will continue not to be taken at all seriously by more eminent Palaeoanthropologists.
Re Bear Grylls:- I should note that Bear Grylls has been cited as a total fraud by a number of sources:-
http://www.outdoor-weblog.com/50226711/bear_grylls_a_fraud.phpand he only eats those bits of live animals for the camera - he is, by no means, a raw-animal-foodist as we understand the term.