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The Terrifying Biology of Prion Diseases: Robert Sapolsky on Creutzfeldt-Jakob Disease

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Creutzfeldt-Jakob disease belongs to one of the strangest and most frightening categories of illness in medicine: prion diseases. These disorders are rare, fatal, and biologically unlike almost anything else that infects the human brain. Robert Sapolsky describes them as nightmare diseases—not only because of their devastating symptoms, but because of the bizarre mechanism behind them. They are part of a family known as spongiform encephalopathies, a term that refers to the sponge-like appearance of the brain after the disease has progressed. In many neurological diseases, damage is selective. One region suffers while another remains relatively intact. Certain neurons die while neighboring glial cells survive. But in Creutzfeldt-Jakob disease and related prion disorders, the destruction is far less specific. The brain can appear as though a bomb has gone off inside it. Neurons, glial cells, and even blood vessel structures are damaged. Under the microscope, the tissue becomes riddled...
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The Brain’s Hidden Cleaning System: Robert Sapolsky on the Glymphatic System and Mental Illness

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For decades, neuroscientists understood the brain as an organ of electrical signaling, neurotransmitters, and vast neural networks. But one fundamental mystery lingered in the background: how does the brain clean itself? Unlike the rest of the body, the brain seemed strangely disconnected from the lymphatic system—the network responsible for clearing waste and toxins from tissues. For years, researchers largely assumed the brain simply handled waste removal in some diffuse, poorly understood way. Then, in 2012, a breakthrough changed the field. Danish-American neuroscientist Maiken Nedergaard and her colleagues at the University of Rochester identified what is now called the glymphatic system, a previously unknown cleaning mechanism that flushes toxic debris out of the brain. The discovery immediately transformed scientific understanding of sleep, neurodegeneration, inflammation, and possibly even psychiatric illness. According to Robert Sapolsky , the glymphatic system is one of ...
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The Silent Prelude to Parkinson’s: Robert Sapolsky on Anosmia and the Brain’s Hidden Vulnerability

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 One of the most unsettling facts about Parkinson’s disease is that the brain may begin deteriorating years, sometimes decades, before the first visible tremor appears. Long before a patient struggles to initiate movement or develops muscular rigidity, another symptom may quietly emerge: the loss of smell, known as anosmia. According to Robert Sapolsky , this early sensory change offers a fascinating and disturbing clue into how Parkinson’s disease may begin. The inability to smell is not merely an unrelated symptom; it may represent the earliest stage of a slow neurological invasion already underway inside the brain. Parkinson’s disease is fundamentally a movement disorder centered around a region deep in the brain called the substantia nigra. This structure relies heavily on dopamine, a neurotransmitter involved in initiating smooth, coordinated movement. Dopamine itself is not dangerous, but its normal breakdown during cellular metabolism produces small amounts of reactive oxy...
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