How To Compare Sodium On Food Labels

Two soups sit next to each other on the shelf. One says “reduced sodium.” The other has a number on the front that sounds promising. You have about thirty seconds before your shopping list sends you somewhere else. Here’s how to give the labels a useful look with your heart in mind. [1]

Sodium is part of the bigger picture for heart health: diets higher in sodium are associated with an increased risk of high blood pressure, which is a major cause of heart disease and stroke. The FDA recommends using the Nutrition Facts label to compare products and paying attention to the amount you eat. [1]

Start With The Serving Size

Find the serving size at the top of each Nutrition Facts label, then look for sodium in milligrams. The sodium number is for one listed serving, not automatically the whole container or the amount in your bowl. Also check servings per container. [2][1]

For example, imagine a soup with 220 mg of sodium per serving and two servings in the container. Eat one listed serving and that’s 220 mg; eat both and that’s 440 mg, before anything you add. Those are made-up numbers to show the math, not a description of a particular product. [2]

Compare The Same Amount

A lower number only tells the full story when the portions match. Imagine crackers A list 100 mg sodium per 30 g, while crackers B list 150 mg per 45 g. If you compare 30 g of each, both work out to 100 mg sodium. The packages look different at first because the serving sizes differ. [2][1]

You can compare a shared weight, a shared volume, or the amount you expect to eat. Keep units consistent: don’t silently treat grams and milliliters as interchangeable. If a label doesn’t give you enough information to make a fair comparison, stick to the listed serving and leave the missing detail unknown. [2]

What The Percent Daily Value Tells You

The % Daily Value, or %DV, puts the sodium in one listed serving in context. The FDA’s general guide is 5% DV or less per serving for a low amount and 20% DV or more for a high amount. Numbers between those guideposts still give you useful information when comparing the same portion. [1][2]

The FDA’s sodium Daily Value is less than 2,300 mg per day. It’s a general label reference, not a personal target. If you eat two listed servings, double the milligrams and roughly double the %DV shown for one serving; label percentages are rounded. Someone following a clinician’s individualized advice may have a different target. [1][2]

Read The Claim, Then Turn The Package Around

“Reduced sodium” compares a product with its regular version; it doesn’t tell you that the result is low in sodium. “No salt added” describes how a food was made and doesn’t necessarily mean zero sodium. The Nutrition Facts panel gives you the amount per serving to compare with another option. [1]

You don’t have to find a perfect package. Start with foods you buy often—bread, soup, sauces, or snacks—and compare a couple of labels in the same category. Ingredients you add at home, including broth, cheese, and seasonings, contribute their own sodium to the finished meal. [1][3]

Make One Comparison On Your Next Shop

Next time you’re choosing between two versions of a staple, check the serving size, compare sodium for the same amount, and use %DV for a little perspective. That’s a practical way to make the information work for you without turning grocery shopping into a math exam. [1][2]