I would consider adding salt to something to be making that thing less healthy. If adding salt is essential to making something edible, I think it would be healthier to opt for something that doesn’t require added salt. That’s speaking generally though, someone might not be getting enough sodium, but typically there is adequate sodium in a diet of whole foods.
I’d say it’s too strong a claim that adding salt makes things less healthy. Remember that humans, eating generally mostly plants but some meat as well, developed rather strong craving for sodium salt, just like most herbivorous mammals. If you eat enough meat (not boiled) you don’t need more sodium, if you eat a little meat or a lot but boiled, it’s probably better to add some. If you eat only potatoes, you’ll die without added salt (just kidding, who eats only potatoes).
The problem with too-hungry people is that yes, they eat too much, and no, they cannot just stop. The way it works is so: they eat a meal, start feeling very hungry an hour later, make an effort and resist eating for another hour, then some more until they can’t anymore and they give in and gobble up everything in the fridge. In cases like this skipping dinner is not actually possible, at least long-term.