Sodium

In cheap, flour based food, salt= flavour. You'll have to munch on a carrot from the greengrocer if you want to avoid salt, fats, carbs and still get takeaway.

The salty, fatty sauces mask the nenatured food.

Simple answer: make your own food.

Most takeaway (like spike says) is flavored with salt because (a) it's cheap, (b) it masks other things if you're getting foods that are lower in fat, etc. because fat and sugar are also cheap flavorings and (c) it's used for preservation.

Get a salad, dressing on the side, or just get oil and vinegar for your dressing and you will avoid a lot of salt. There is still salt in growing plants -- you will never be 100% free of it, nor should you be, as it is a necessary nutrient -- but it's far better than standard takeout fare. Tomatoes and fish are often preserved with salt, and cheese of course is made with it.

Keep as well within 2400 mg/day as you can, and recognize that some days you'll be over, and that's healthy and as good as can be expected in our busy lives these days.

If it's any consolation, a healthy body can process large quantities of salt without harm. While there is some evidence that those with hypertension be at higher risk for heart issues, a normal healthy person will just get a little more thirsty.

engineer-
How large a quantity of salt can a person consume daily without harm? Does high quantities of salt raise the blood pressure of some people? Is there a scientific study I can refer to that corroborates your statements? Do you have any medical or scientific credentials?