Sodium content is usually higher in processed food. Fresh or raw foods contain much less sodium and often do not have labels, such as fruits and vegetables.
The sodium content of foods within the same group (such as crackers and soups) may vary widely. Be sure to read the label.
The Nutrition Facts label provides the amount of sodium per serving, so check your serving size. Go by the milligram amount rather than the percentage, as it is based on a 2400 mg-per-day diet and will be inaccurate for any other level.