Ancient Humans
The Purest Diet in History Came With a Life Expectancy of 30
· 8:09
Every human who ever lived, for three hundred thousand years, ate one hundred percent organic. Wild, free-range, no pesticides, no preservatives. The purest diet in the history of our species. The life expectancy that came with it was about thirty.
So if the purest natural diet in history came with the shortest lives ever measured, what actually took us from 30 to 80? Asked this on a 2025 podcast, astrophysicist Neil deGrasse Tyson answered in one word: science.
This is the honest story of that jump. The “appeal to nature” trap a philosopher flagged back in 1903 (G.E. Moore). What a Stanford review of 237 studies really found about organic food (Smith-Spangler, 2012). Why “everyone only lived to 30” is a statistical ghost and not a real person - once you survived childhood you were likely to reach your 70s, then and now (Gurven and Kaplan, 2007). And the unglamorous heroes that actually did it: clean water and sewers, germ theory, vaccines, one stubborn doctor who told his colleagues to wash their hands, and a lucky spot of mold.
It was never the food. It was the science.
Chapters
- 00:00 The organic premium
- 00:14 300,000 years of organic food
- 00:45 Neil deGrasse Tyson's one-word answer
- 01:18 The appeal-to-nature trap
- 01:51 What 237 studies say about organic food
- 02:21 Why "everyone lived to 30" is a myth
- 03:05 Survive childhood, reach your 70s
- 04:02 What actually changed after 1800
- 04:15 Clean water, germ theory, vaccines
- 05:16 Handwashing and antibiotics
- 06:19 The honest twist: farming made us sicker at first
- 07:13 What really bought you 50 extra years
- 08:06 Next time
Sources
Every Norbo Explains video is built on real research.
- Organic vs conventional food, a 237-study review: Smith-Spangler et al., 2012 (Annals of Internal Medicine)
- Survive childhood and you were likely to reach your 70s: Gurven and Kaplan, 2007 (Population and Development Review)
- The "appeal to nature" / naturalistic fallacy: G.E. Moore, 1903 (Principia Ethica)
- Sanitation voted the greatest medical advance since 1840: BMJ readers' poll, 2007
- Cholera traced to a single water pump: John Snow, 1854 (Broad Street, London)
- Germ theory: Louis Pasteur and Robert Koch, 1860s-1880s
- Handwashing cut childbed fever: Ignaz Semmelweis, 1847
- Penicillin found by accident: Alexander Fleming, 1928
- Neil deGrasse Tyson on why we live longer now: podcast interview, 2025
Questions people ask
Did our ancestors really eat 100% organic?
Yes — no pesticides, no additives, no processing. They also lived to about 30 on average. The purest diet in history came bundled with parasites, contamination and chronic food shortage.
Is organic food significantly healthier?
The largest review — Stanford's analysis of 237 studies led by Smith-Spangler — found surprisingly little nutritional difference between organic and conventional food. The health halo is mostly marketing.
Why did ancient people die so young if their diet was so pure?
The average is dragged down by brutal infant mortality, infections and accidents — not by their food. Hunter-gatherers who survived childhood often reached their 60s and 70s, as Gurven and Kaplan's demographic work shows.
