If you remove most of the salt-craving brain cells, mice no longer seek out salt—even when they’re very low on it.

Just turning on the salt-craving brain cells doesn't make mice eat salt fast—unless you also trigger the angiotensin signal, then they immediately start licking salt like crazy.

When mice are low on salt, certain brain cells in the back of the brain start firing on their own like a heartbeat, thanks to special sodium channels, and this makes them crave salt.

Only the salt-sensing brain cells get more active when salt is low—not other nearby cells—and they don’t get the signal from nerves in the gut, meaning they respond directly to hormones in the blood.

It’s not just being thirsty that makes mice eat salt—only when the angiotensin signal is present does turning on salt-craving cells make them lick salt, not when they’re just dehydrated.

Activation of sodium-sensing neurons (NST) by oral sodium intake modulates satiety signaling and reduces appetite.