In the book, Catching Fire, which is a very interesting book but has nothing to do with fasting, the author wrote, "In deserts like the Kalahari, the result can be difficult indeed (to find enough to eat in some seasons), but periodic shortages of energy like this are routine in all living hunter-gatherers, just as they are in rainforest chimpanzees. Judging from studies of bones and teeth, which show in their fine structure the marks of nutritional stress, energy shortages (shortages of sufficient digestible food) were also universal in archeological populations. Until the development of agriculture, it was the human fate to suffer regular periods of hunger — typically, it seems, for several weeks a year — even though they ate their food cooked."
The book is about how cooking changed an ape-like animal into homo sapiens.
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Adam Khan is the author of Principles For Personal Growth, Slotralogy, Antivirus For Your Mind, and co-author with Klassy Evans of How to Change the Way You Look at Things (in Plain English). Follow his podcast, The Adam Bomb.