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Aster Medical Journal (AMJ)

Why Do You Feel Lonely? Neuroscience is Starting to Find Answers

Long before the world had ever heard of COVID-19, Kay Tye set out to answer a question that has taken on new resonance in the age of social distancing: When people feel lonely, do they crave social interactions in the same way a hungry person craves food? And could she and her colleagues detect and measure this “hunger” in the neural circuits of the brain?

“Loneliness is a universal thing. If I were to ask people on the street, ‘Do you know what it means to be lonely?’ probably 99 or 100% of people would say yes,” explains Tye, a neuroscientist at the Salk Institute of Biological Sciences. “It seems reasonable to argue that it should be a concept in neuroscience. It’s just that nobody ever found a way to test it and localize it to specific cells. That’s what we are trying to do.”

In recent years, a vast scientific literature has emerged linking loneliness to depression, anxiety, alcoholism, and drug abuse. There is even a growing body of epidemiological work showing that loneliness makes you more likely to fall ill: it seems to prompt the chronic release of hormones that suppress healthy immune function. Biochemical changes from loneliness can accelerate the spread of cancer, hasten heart disease and Alzheimer’s, or simply drain the most vital among us of the will to go on. The ability to measure and detect it could help identify those at risk and pave the way

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