We’ve never understood how hunger works. That might be about to change.

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You haven’t seen hungry until you’ve seen Brad Lowell’s mice.  A few years ago, Lowell—a Harvard University neuro­scientist—and a postdoc, Mike Krashes, figured out how to turn up the volume on the drive for food as high as it can go. They did it by stimulating a bundle of neurons in the hypothalamus, an area…

https://www.technologyreview.com/2024/01/02/1084713/how-does-hunger-work-appetite/