HUMAN teeth are getting smaller as we become smarter, claim Spanish researchers.
Throughout the 2.5 million year history of man, brains have become larger as teeth have decreased in size.
The unlikely findings, described as an evolutionary paradox, could be because of a change in diet.
Logic would suggest that as brains grow we would need to eat more to sustain a higher metabolism.
But the scientists have suggested that eating more nutritious food, such as animal meat, has allowed us to eat less while still getting adequate levels of proteins and fats.