Suddenly there was a decrease in temperature, widespread loss of forest and plant life which greatly increased areas of dry savanna. Almost 80% of all mammals and most upright apes (hominids) died of starvation or intensified competition and became extinct. Those species that survived, such as the species that became human, had developed a finely tuned ratio of body fat to lean body mass. Protective brain mechanisms do not tolerate alterations without intense symptoms.
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