Snapshot · The Diary Of A CEO with Steven Bartlett
A UK Biobank study tracked GDF-15, an energetic stress cytokine, and found that people with high levels were significantly more likely to develop mental illness, cardiovascular disease, or die over a 14-year follow-up.
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At 2:04:20 · chapter starts 1:53:20
To demonstrate that mental stress has measurable biological consequences, Picard describes his lab's shoplifting court scenario: participants are told they must defend themselves in front of a judge while being filmed, and blood is drawn in real time. GDF-15 — the energetic stress cytokine — spikes with purely psychological pressure. That protein travels to the brainstem's area postrema (the nausea and vomiting center), where the only receptor for it in the body is located. The brain interprets GDF-15 as a signal that something is running out of energy — the same signal produced by infection — and responds identically: conserve energy (lose motivation, become asocial) and mobilize fat and glucose into the blood. That mobilized energy, if not burned off by physical activity, gets stored as ectopic visceral belly fat. The UK Biobank's 14-year follow-up makes the stakes clear: chronically elevated GDF-15 predicts bipolar disorder, depression, schizophrenia, cardiovascular disease, and early death. The chapter makes concrete that chronic mental stress is a literal metabolic disease.
Mental stress triggers a protein called GDF-15, which the brain interprets as a signal that the body is running out of energy — the same signal triggered by infection. The brain then does two things: conserves energy (you lose motivation and feel depressed) and mobilizes fat and glucose into the blood, which gets stored as visceral belly fat.
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