Starvation can result from failing to detoxify staple foods even with full stomachs

Evidence

Like many plants used by hunter-gatherers, nardoo is indigestible and at least mildly toxic unless properly processed. Unprocessed nardoo passes through only partially digested and contains high levels of thiaminase, which depletes the body’s store of thiamine (vitamin B1). Low levels of thiamine cause the disease beriberi, resulting in extreme fatigue, muscle wasting, and hypothermia. To address this problem, the customary nardoo processing practices of aborigines appear to have multiple elements built in that make nardoo edible and nontoxic. First, they grind and leach the flour with copious amounts of water, which increases digestibility and decreases concentrations of the vitamin B1-destroying thiaminase. Second, in making the cakes, the flour is directly exposed to ash during heating, which lowers its pH and may break down the thiaminase. Third, nardoo gruel is consumed using only mussel shells, which may restrict the thiaminase’s access to an organic substrate that is needed to fully initiate the B1-destroying reaction. Failure to deploy these local practices means that our unfortunate trio managed to starve and poison themselves while keeping their stomachs full. — Joseph Henrich, The Secret of Our Success, 126

Categorization

• CANDY: Burke and Wills starved to death while eating: indigestible toxic flour depletes B1, causing beriberi, while the stomach stays full — a memorable reversal of the starvation intuition.
• DEFINE: Concretely illustrates that ‘edible’ food acquired through cultural foraging still demands multi-step detoxification — grind, leach, ash-heat, mussel-shell eating — against a thiaminase mechanism.
• XREF: connects to: Starvation can result from eating calorie-rich but unprocessed toxic plants. — Joseph Henrich, The Secret of Our Success: How Culture…, 125; Ancient diets included substances hard for us to digest, requiring adaptation. — Neil MacGregor, A History of the World in 100 Objects, 167; Subsistence peoples continue eating contaminated food despite advisories because eating is sacred obligation (+1 more)

Broader Connections

• Starvation can result from eating calorie-rich but unprocessed toxic plants. #corroborates (0.93) — Joseph Henrich, The Secret of Our Success, 125
• Desperate hunger drives even a spoiled boy to eat food that poisons him #exemplifies (0.80) — Isabella L. Bird, A Lady’s Life in the Rocky Mountains, 241
• Subsistence peoples continue eating contaminated food despite advisories because eating is sacred obligation #expands (0.78)
• Ancient diets included substances hard for us to digest, requiring adaptation. #complicates (0.72) — Neil MacGregor, A History of the World in 100 Objects, 167