Advice to ‘cut sodium and add potassium’ can sound like a universal formula. A package label, a DASH planning target, and an individual limit are different kinds of information. The U.S. National Heart, Lung, and Blood Institute (NHLBI) describes DASH as an eating pattern that includes fruits, vegetables, whole grains, low-fat dairy, beans, and other foods. Its example for a 2,000-calorie plan lists 2,300 mg of sodium; it notes that 1,500 mg may lower blood pressure further and says serving needs vary with calorie requirements. Those figures should not be read as a prescription for every person. See the NHLBI DASH guide for the foods and conditions behind the numbers.

Compare the pattern, not one label in isolation

DASH describes an overall eating pattern rather than a supplement or a single ‘blood-pressure food.’ On a package, check both sodium per serving and the serving size, then compare that amount with what you actually eat. A label alone cannot show the sodium in a whole day: sauces, soups, restaurant meals, snacks, and cooking ingredients also count. If you are keeping notes, record the product, portion, and whether it was prepared at home or bought ready-made. That makes a later grocery comparison more useful than a single number without context.

Potassium is not a score that simply cancels sodium. The American Heart Association (AHA) says potassium-rich foods can help reduce sodium’s effects, while warning that excess potassium can be harmful for people with kidney disease, certain conditions, or medicines that affect potassium. The same caution applies to potassium-based salt substitutes and supplements: ask a healthcare professional first. The AHA potassium guidance describes these limits alongside possible benefits.

A three-step check before changing your groceries

  • 1. Read the sodium amount and serving size, then convert the label to the portion you actually eat. A ‘lower sodium’ label does not tell you the total for a meal.
  • 2. Look at how vegetables, fruits, whole grains, and beans could fit into your usual meals, as the DASH pattern describes. If a full change feels impractical, compare one frequently eaten product or cooking habit first.
  • 3. If you have kidney disease or take medicine that affects potassium, ask your clinician or pharmacist before increasing potassium or switching to potassium salt. Do not reduce or stop prescribed medicine because you changed your diet.

For a fictional example, someone who often eats soup could first record the label’s serving size and the amount in their bowl, then note sodium sources in the rest of the meal for several days. They might compare a different product or preparation method where practical, and review blood-pressure readings with their care team using the measurement routine that team recommends. Potassium salt is not an automatic next step; kidney function and medicines need to be considered before deciding whether it is suitable.

Common misreadings and limits

Avoid turning the guidance into ‘less sodium is always better’ or ‘more potassium is always better.’ The NHLBI figures include a particular calorie example, and AHA guidance pairs possible potassium benefits with health and medicine cautions. If you take blood-pressure medicine or have kidney or heart disease, are pregnant, or follow another restricted diet, set targets with your care team. This article explains how to interpret food information; it does not diagnose hypertension or provide an individualized diet or treatment plan.

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