New Delhi, Aug. 20 -- Naturally-sweet foods helped fuel human brain evolution significantly, new research suggests. Scientists from the University of Sydney and the University of Glasgow jointly conducted this study.

Published in Science, the study modelled glucose requirements across 4 million years of evolution. Researchers found that natural sugars supplied substantial energy before cooking became widespread.

Over four million years, the human brain's size expanded from the initial 300 grams. Modern human brains now weigh around 1.5kg on average. As brains grew larger, glucose demand increased across various bodily tissues. This includes red blood cells, kidneys and reproductive organs.

According to lead author Professor Jennie Bran...