New work by an international team of researchers shows that the cranium of modern Homo sapiens is poorly-suited to produce large biting forces due to an primary limitation involving the jaw joint. The findings are consistent with the theory that as early humans developed processing techniques that both softened food and allowed it to be stored,there was less environmental pressure to preserve the higher bite force of our ancestors and primate relatives. It may also help define modern humans' flatter, slender faces.
Source: phys.org