Here, we propose the initial metabolic trigger of hominid brain expansion was the consumption of externally fermented foods. We define “external fermentation” as occurring outside the body, as opposed to the internal fermentation in the gut. External fermentation could increase the bioavailability of macro- and micronutrients while reducing digestive energy expenditure and is supported by the relative reduction of the human colon.
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Having never watched Futurama, I am floating here.
Interesting hypothesis, but it seems very unlikely. Safely fermenting any calorie-dense plant matter in the tropics without airtight containers or other equipment would be more a matter of luck than anything. It would not be a reliable means of increasing caloric intake for an entire population. A much simpler explanation for human brain expansion? Sweet fruit. No tools, no fire, no difficult digestion. Neuroscientist Tony Wright has researched this possibility extensively.
