Your Body Runs on Ancestral Time: Modern Life Is Breaking It | Geneticist Kate Crosby

About this episode

Vance opens by revealing his own health scare (a thyroid mass, biopsy, upcoming partial thyroidectomy) as the frame for a wide-ranging conversation with geneticist/light-researcher Kate Crosby. They cover the thyroid's role as the body's biological "clock," vitamin D/magnesium's link to circadian timing, exercise-triggered memory recall, geography-and-ancestry-driven adaptation to seasonal light/diet ("keto in winter" logic), and skin/sun exposure ("photo-hardening"). The conversation pivots into a striking speculative theory linking European religious geography (Protestant north, Catholic Mediterranean, Orthodox east, Islamic south) to historical fat-source/climate gradients, and the "how vs. why" distinction in Protestant vs. Catholic/symbolic communication styles. They discuss the loss of seasonal/temporal rhythm in modern life (24/7 produce, Sunday shopping, flattened weekends), Kate's reflections on not having children and finding meaning through ideas/relationships instead, and gender-difference observations on risk tolerance and "pretty privilege." Closes with a Legacy Interviews plug and the recurring IBC-course testimonial montage.

“The north was all Protestant and then as you move south you got to Mediterranean Catholicism... and then you overlay the primary fat group from those regions and it's almost like a perfect match... I wonder if faith is just like emergent from the environment.”

“It's better to ask them how than why... why is a symbolic question... but if you ask them a how question, now it's not in the realm of symbolic thinking... it allows them to express symbolic thinking in very precise language.”

“The only way a story goes on into the future is if it is passed on somehow... stories are alive in some way and they're always changing and evolving.”

Key moments

• Vance frames the episode around his thyroid health scare as part of a broader shift toward "legacy" conversations he'd want his kids to hear.
• Kate's explanation of the thyroid as the body's "clock," and vitamin D/magnesium as circadian/hormonal regulators tied to fat-solubility and latitude/skin-type ("Fitzpatrick") adaptation.
• Kate's personal discovery that intense exercise triggers unexpected memory recall, theorized as peripheral-nervous-system electrical activity "reconnecting" dormant neural pathways.
• Extended riff on ancestral/latitudinal diet adaptation — fertility rates rising as populations move south, and the mismatch of eating "summer" foods (fresh fruit) in winter disrupting the body's seasonal signaling.
• Kate's striking geography-of-faith theory — mapping European Protestant/Catholic/Orthodox/Islamic religious boundaries onto historical dietary fat sources (butter/olive oil/date palm/sunflower) as evidence that faith is "emergent from the environment."
• The "how vs. why" distinction as a cross-faith communication tool — why-questions trigger symbolic/imaginative thinking, how-questions produce precise sequential reasoning, mapped onto Protestant vs. Catholic communication styles.
• Vance's story about reading his kids unsanctioned violent Old Testament stories (Saul's massacre) and the broader argument that modern culture has "sanitized" the raw, stark content children used to be exposed to.
• Kate's hypothesis that modern society has "canceled seasons" — losing embedded temporal rhythm via 24/7 produce, retail, and climate control — and Vance's parallel about flattening Saturday/Sunday via youth sports scheduling.
• A candid, personal exchange about Kate not having children — her reflections on "pretty privilege," risk-aversion in women vs. men at midlife, and finding meaning through ideas, patents, and relationships instead of legacy through offspring.

Notable quotes

“The north was all Protestant... and then you overlay the primary fat group from those regions and it's almost like a perfect match. I was floored.”

“Why is a symbolic question... but if you ask a how question, now it's not in the realm of symbolic thinking.”

“We basically canceled seasons... there is a graying out of time where you're not having these fluctuations.”