Meanwhile, in the hominin fossil record…

Meat Wasn't the Only Food That Drove Early Humans to Evolve Bigger Brains. Sugar May Have Fueled the Organ's Enlargement, Too smithsonianmag.com

Four million years of hominin diet, read from teeth and chemistry, suggests the growing human brain ran partly on sugar — honey, fruit and other natural glucose — not just on meat. The energy arrived before cooking made starchy roots digestible, which shifts the timeline of what fuelled our expensive organ.