A jar of sauce can look like a simple purchase until you turn it around. There is a sodium number, a percentage, a serving size and perhaps a claim on the front. None means much in isolation. The useful question is how that product compares with another you could realistically use, in the amount you would actually eat.
You do not need to audit the whole kitchen at once. Start with one food you buy regularly and learn its label. This guide uses the US Nutrition Facts format; labels elsewhere may display salt instead of sodium and organize their information differently. Keep the units and the amount of food consistent when comparing.
Start with the serving, then the sodium
The US Food and Drug Administration's sodium guidance, checked in September 2026, explains that the sodium Daily Value is 2,300 milligrams. On US labels, 5% Daily Value or less per serving is considered low and 20% or more is high. These are reference points, not personalized medical targets.
Check the serving size before comparing two products. The FDA also notes that sodium varies between similar foods and that packaged and prepared foods account for most dietary sodium. Moving the salt shaker alone therefore misses much of the picture.
Think of the label as a description of a specified amount. It is not an instruction about how much you must eat, and it is not a score for the entire meal. That distinction makes the information easier to use without turning shopping into a pass-or-fail exercise.
Make the arithmetic match your plate
Imagine a hypothetical soup with 400 milligrams of sodium per cup. If you eat two cups, that portion contains 800 milligrams. A different soup with 300 milligrams per half-cup would contain 1,200 milligrams in the same two-cup portion. The smaller printed number was not the lower-sodium choice.
Those numbers are an illustration, not values from a particular brand. You can use the same method with your own products: find the amount listed, establish how many of those servings you use, and multiply. If the package also provides information for the entire container, check whether that matches your meal.
For two jars of sauce, compare the same weight or volume. For bread, check whether the numbers refer to one slice or two, and whether the slices differ substantially in size. If the calculation becomes inconvenient, a photograph of each label lets you compare at home without blocking the supermarket aisle.
Choose one regular purchase
Make your first comparison something you use often: a soup, a cooking sauce, bread or a ready meal. Choose between products that serve the same purpose. Comparing soup with fresh fruit tells you little about which soup to put in your basket.
Write down three things: the product, its sodium for your usual portion, and whether you would actually enjoy buying it again. Include the price if that matters to your household. A cheaper option that tastes good and is reliably available may be more useful than an idealized choice you cannot find next week.
There is no need to replace everything immediately. If you have already bought food, plan how to use it. Making room for a different option on the next shopping trip can be a more manageable approach than discarding usable groceries.
Look at how ingredients come together
Consider a familiar lunch, such as a sandwich and soup. List the components rather than assuming one ingredient explains the whole meal. Bread, filling, condiments and soup each have their own label information. Choose one component to compare first.
For a home-cooked meal, a recipe note can be useful. Record which stock, sauce or seasoning you used and roughly how many portions the recipe made. You do not need a perfect spreadsheet to discover that you would like to try a different stock next time.
The FDA suggests herbs, spices and no-salt seasoning blends as ways to add flavor. You could try lemon with a vegetable dish or a herb you already enjoy in a sauce. Taste the result and record what worked. Check blends themselves rather than assuming every jar of seasoning has the same ingredients.
Treat front-of-pack words as a starting point
A claim on the front deserves a look at the full label, particularly when you are comparing different brands. A product described relative to another version still needs to be assessed in the portion you use. Look for the actual sodium quantity instead of making your decision from a single adjective.
Also consider the rest of the food. Sodium is one part of nutrition information, and your meals still need to suit your appetite, preferences and circumstances. You may decide that a particular product is worth keeping while making a change elsewhere.
This approach leaves room for convenience. A meal that you can prepare after a long day has practical value. The comparison is between realistic options for that evening, not between your dinner and a theoretical menu requiring time or equipment you do not have.
Bring personal targets to a professional
If a clinician has given you a sodium target, ask how to use it across your normal meals. A registered dietitian can help translate numbers into shopping and cooking decisions. Bring labels or a short food record so the conversation begins with what you actually eat.
Before starting a restrictive eating protocol or using salt substitutes or supplements, check with your clinician, particularly with pregnancy, medications or existing conditions. Do not assume a general label reference replaces advice given for your own care.
For now, choose one label, one fair comparison and one possible change. Save the details somewhere easy to find on your next shop. The goal is to understand a purchase well enough to make a decision you can repeat.
Photo: Rachel Claire on Pexels.