Lack of salt makes people fat. I don’t think there is a single factor in the obesity plague, but when I’m fat and on a diet if I have some broth or salty water, I don’t get hungry. I’m not the only one to notice this, though it’s difficult to find it digging through the nutrition literature which is written by a bunch of statistical imbeciles and “head girls” who are more concerned with getting socially acceptable answers than correct ones. Lots of bro science about it while fasting; you can go without food for days, but you need salt to keep moving or you’ll cramp up. I remember being a kid and seeing some movie about soldiers being issued with salt tablets in the desert: obviously people used to know about this, and somehow they no longer do (presumably long distance runners or people in the desert do).