"Reduced sodium" sounds like a straightforward win on a label, but the term is relative by legal definition, not absolute — and relative to what can matter as much as the claim itself.

What "reduced sodium" legally means

In the U.S., "reduced sodium" legally requires at least a 25% reduction in sodium compared to the standard version of that same product from the same manufacturer. It says nothing about how the product compares to other brands, or to a nutritional target you might personally be working toward — only that it's meaningfully lower than that specific manufacturer's regular version.

  • "Low sodium": 140 mg or less per serving, a defined absolute threshold rather than a comparison.
  • "Very low sodium": 35 mg or less per serving.
  • "Sodium free": less than 5 mg per serving, close enough to zero to be treated as such.
  • "Light in sodium" or "lite": at least a 50% reduction compared to the standard version, a stricter cut than "reduced."

Why "reduced" doesn't mean "low"

Because "reduced" is a comparison rather than an absolute threshold, a product that starts out very high in sodium can cut 25% and still land well above what most people would consider a low-sodium choice. A "reduced sodium" soy sauce or canned soup, for example, can still carry several hundred milligrams per serving, since the starting point was so high to begin with. The claim is accurate; it just isn't the same guarantee as "low sodium."

The same logic applies to "less sodium," a claim that carries the same 25%-reduction requirement as "reduced sodium" under FDA rules — the two phrases are functionally interchangeable on a label even though they read slightly differently, and neither one implies an absolute low-sodium threshold has been met.

How much sodium is a lot, in a day

The Dietary Guidelines for Americans, published jointly by the USDA and HHS, recommend limiting sodium to less than 2,300 mg a day for most adults — roughly a teaspoon of salt — while the American Heart Association's ideal limit for most adults, especially those managing blood pressure, is lower still, around 1,500 mg a day. Framed against either number, a single "reduced sodium" can of soup carrying 480 mg per serving can still represent a meaningful share of an entire day's target in one meal, particularly for anyone working toward the lower, heart-association figure.

Most sodium in a typical American diet doesn't come from the salt shaker at home; the CDC and other public health groups have noted that the large majority comes from packaged and restaurant food, where it's added during manufacturing or preparation rather than at the table. That's part of why label-reading matters more for sodium specifically than it might for a nutrient people are more used to controlling by hand.

Reading the actual number instead

The nutrition facts panel settles this in seconds: check the actual milligram amount per serving rather than relying on the front-of-package word. A "reduced sodium" product with 480 mg per serving is still a meaningfully salty food in absolute terms, even though it's an improvement over its full-sodium counterpart.

A quick way to compare two products

When choosing between two similar products, the fastest comparison is sodium-per-serving on the actual panel, not which one has a "reduced" or "light" claim printed on the front. Two "reduced sodium" products from different brands can differ by hundreds of milligrams from each other, since each is only being compared to its own regular version rather than to a shared standard.

If the serving sizes differ between the two products you're comparing — one listing sodium per cup, the other per half-cup, for instance — normalize the numbers to the same serving size before comparing, or the "lower sodium" product on paper can actually turn out to be higher once portions are matched. This is a common way an otherwise careful sodium comparison goes wrong.

Where reduced-sodium products tend to help most

"Reduced sodium" claims tend to be most useful in categories that are extremely high in sodium to begin with, like canned soups, soy sauce, and cured or processed meats, where even a 25% cut can meaningfully change a daily total if that product is eaten regularly. They're less impactful on foods that were never a major sodium source in the first place. Prioritizing which high-sodium staples in your own regular rotation to swap for a reduced version tends to matter more than applying the swap evenly across everything in your cart.

It's also worth noting that a lower-sodium version of a product sometimes tastes noticeably different, since salt does real work in flavor and preservation beyond just seasoning — some reduced-sodium products compensate with added sugar or other flavor enhancers to make up the difference. Checking the rest of the label on a reduced-sodium swap, not just the sodium line, is a reasonable habit so one number doesn't improve at the expense of another.