Things we know about our ancestors generally come from two sources: their own accounts, and the things they have left behind. In other words, history, and archaeology. When there’s no written record of a culture – and the earliest examples of writing are around 5,000 years old – we have to rely on artefacts and biological remains. Authors of stone-age diet plans have relied on out of date and, well, half-digested archaeological evidence of what life was like thousands of years ago. Accuracy isn’t their priority – selling books is. FYI, there is attached in the article a very interesting TED talk on the subject.
