If you don’t know that context is used in archaeology then it’s not so much that you miss science, it’s more that you don’t understand it.
You wanted a reference, here’s one.
http://www.proteinpower.com/drmike/low-carb-diets/nutrition-and-health-in-agriculturalists-and-hunter-gatherers/
http://www.reshafim.org.il/ad/egypt/timelines/topics/domesticated_animals.htm