I did provide a link for those that wanted to read further. Here it is again. Remember this is an inter-species comparison. This is the gastro-intestinal system - not a measure of body fat
Perhaps this "hypothesis" deserves its own thread. And perhaps it can be stated as something other than an assertion therein. If that should happen, those who support the idea should prepare to face simple common-sense evidence, like a picture of a fat dude.
Actually starvation is very high on the list. I can recommend several books
I'm not familiar with this idea. I've heard explorers died due to disease, heat, dangerous natives, and all sorts of causes. Somehow I doubt starvation is very high up on the list. I would further expect a good amount of whatever starvation did take place was due to ignorance rather than actual lack of available food.
The Darkest Jungle: The True Story of the Darien Expedition and America's Ill-Fated Race to Connect the Seas
The River of Doubt: Theodore Roosevelt's Darkest Journey
The Lost City of Z (soon to be a major motion picture starring Brat Pitt)
Of course, preparation is always an issue. However, in the above cases, the expeditions often resorted to shooting the local primates to avoid starvation.
I would guess that if you were thrown into an environment where chimps or gorillas live, you would have a very difficult time surviving. Your big brain demands larger amounts of digestible protein and your weak digestive system makes most of the forest undigestible.
Now that the irrelevant has been addressed, can someone explain how come there are still apes? How is it that intense competition and struggle permitted the unfit to survive right alongside the fit for millions of years? How come the selection goddess took yet another vacation?
I know intelligence, and the extreme uniqueness of mankind is being discussed as well. At least that's a related topic. Both are valid, unanswered questions, and both deal with evostories about human origins.
You are starting with the incorrect assumption that non-human apes are less fit than humans for their environment. Maybe you can explain why you think non-human apes are unfit for their jungle environment.
There are a set of related questions. What environmental changes and mutations allowed at least one line of apes to move towards larger and larger brains (that require high amounts of digestible protein). If the early human line became "unfit" for the jungle environment, what environment were they more fit for?