A new study published in PNAS uses advanced technology to map the oral bacteria of ancient human and Neanderthal samples which outlines a major dietary component.

Main Study: https://www.pnas.org/content/118/20/e2021655118

Supplementary Material: https://www.pnas.org/content/pnas/suppl/2021/05/06/2021655118.DCSupplemental/pnas.2021655118.sapp.pdf

Science Mag:
https://www.sciencemag.org/news/2021/05/neanderthals-carb-loaded-helping-grow-their-big-brains

Strep Biofilm: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC100085/

Fire 2 million years ago:
https://web.archive.org/web/20151017032715/http://faculty.ksu.edu.sa/archaeology/Publications/Hearths/Hominid%20Use%20of%20Fire%20in%20the%20Lower%20and%20Middle%20Pleistocene.pdf

Fire 780K years ago:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3069174/

BROAD Study: https://www.nature.com/articles/nutd20173

Whole Grains and Mortality: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4910651/