It seems like everything at the grocery store has too much salt in it. This is not to mention restaurant food, which is way too salty. Food merchants know that adding salt to everything makes it taste better and extends its shelf-life. So they put it in everything.
If you are like me, and rely on ready-made food at the supermarket a lot, than you are probably consuming too much salt and not enough water. This is a big issue that affects many people.
The only way to reduce sodium content in your diet is to make as much food by yourself and not rely on ready-made food and restaurant food for your sustenance. Look at labels too.
Electrolyte balance is important, and most people are consuming too little potassium and way too much sodium. This will hurt you in the long run. If you truly want to live a long time, eat less processed foods and more fresh foods, and cook more from scratch or avoid as many conveniences as possible. The more layers of processing a food has, the more salt the manufacturers add in the process.
Salt is less harmful than other things like sugar and saturated/hydrogenated fats, but it is still overdone in western society, and you should do your best to eat as little salt as possible.