Ancestral Health--what is it?

Got me. I saw an article about the Ancestral Health Symposium (9th) held August 12 in California so have been searching for articles (it was sold out). In simple terms, it's probably about eating "natural." Came across something by a diabetes group on Paleo, Primal, real/whole food, keto etc. ways of eating, but nothing substantial. There is also a Vitamin D chapter in this group presenting on protections against SARS (many trials and published papers), Omega-6 group, seed oils, cognitive decline, the hidden health epidemic, the anti-meat ethics, bone health, African traditions, infections and psychiatric disorders, gateway drugs. This Youtube says there are 20 presentations. AHS21 - YouTube