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I'd be very interested in that documentary.

You may be interested in this study on an Australopithecene who was transferring from forest to savanna, whose jaw and teeth suggest subsistence mainly on diet of hard or tough foods such as ground tubers, nuts and seeds: Macho, Gabriele A. “Baboon Feeding Ecology Informs the Dietary Niche of Paranthropus Boisei.” PLoS ONE, vol. 9, no. 1, Aug. 2014, doi:10.1371/journal.pone.0084942. (abstract below)

Basically, biological anthropologist Gabriele Macho studied whether a diet of tiger-nuts, edible bulbous tubers of the sedge Cyperus esculentus , would provide nutritional needs for the early hominin Paranthropus boisei. She determined that it would have contained sufficiently high amounts of minerals, vitamins, and of particular importance, fat for the hominin brain. Hominins selectively gathered parts of grasses and sedges, such as bulbs and grass blade bases, for their diet mainstay. Abrasive tiger-nuts, rich in starches, were also digested by chewing for a sufficient time, up to 3 hours for 80% daily calorie intake, corroborating fossil cranial anatomy. Large primates typically forage 5-6 hours a day. This is how ‘nutcracker man’ earned his moniker, surviving for around one million years because they could successfully forage nuts through shifting climatic conditions.

Also, since Richard Wrangham and others concur that a major food source of cooked foods was from plants, if the problem was shrinking plant opportunities, where do the increase in plants come from? The cooking makes big brain theory is that they were able to consume I larger amount of calories without expending the chewing energy. If you'd like, I could show you another study that points to fat from passively scavenged brain and marrow as being an instigator of brain growth before controlled fire.

Abstract

Hominins are generally considered eclectic omnivores like baboons, but recent isotope studies call into question the generalist status of some hominins. Paranthropus boisei and Australopithecus bahrelghazali derived 75%–80% of their tissues’ δ13C from C4 sources, i.e. mainly low-quality foods like grasses and sedges. Here I consider the energetics of P. boisei and the nutritional value of C4 foods, taking into account scaling issues between the volume of food consumed and body mass, and P. boisei’s food preference as inferred from dento-cranial morphology. Underlying the models are empirical data for Papio cynocephalus dietary ecology. Paranthropus boisei only needed to spend some 37%–42% of its daily feeding time (conservative estimate) on C4 sources to meet 80% of its daily requirements of calories, and all its requirements for protein. The energetic requirements of 2–4 times the basal metabolic rate (BMR) common to mammals could therefore have been met within a 6-hour feeding/foraging day. The findings highlight the high nutritional yield of many C4 foods eaten by baboons (and presumably hominins), explain the evolutionary success of P. boisei, and indicate that P. boisei was probably a generalist like other hominins. The diet proposed is consistent with the species’ derived morphology and unique microwear textures. Finally, the results highlight the importance of baboon/hominin hand in food acquisition and preparation.