https://nutritionfacts.org/video/big-salt-getting-to-the-meat-of-the-matter/
Why is the salt industry so powerful? They have their own PR and lobbying firms to play tobacco industry-style tactics to downplay the dangers. But salt is so cheap. How much money are they really making? It’s not the salt mine barons; it’s the processed food industry. Just like the sugar industry could care less if we buy a two-pound bag at the store, it’s the trillion-dollar processed food industry that uses the dirt-cheap added salt and sugar to sell us their junk. And, by hooking us on hyper-sweet and hyper-salty foods, our taste buds get so dampened down that natural foods taste like cardboard.
Dr. Kempner took care of some patients who could no longer afford to eat the tiniest amount of salt anymore because their kidneys were so irreparably damaged. Therefore, even the protein in rice would give them troubles and that's why adding tons of sugar would lower the percentage of calories from protein.
Lustig et al. created a "sensational phobia" of some sort and all of a sudden sugar seemed to have become THE public enemy. However, Jeff talked about a study below and sugar (30 tsps a day) didn't really seem to be problem at all as long as they're able to restrict their caloric intake to roughly 1,100 kcal:
https://www.drmcdougall.com/forums/viewtopic.php?f=22&t=57026
And then we've got urban legend like sugar feeds cancer and sugar makes you fat etc.