What Does Low Sodium Mean on a Food Label?

A low sodium claim on a food package is not simply a manufacturer's opinion that the product contains relatively little sodium. In markets where nutrition claims are regulated, the product must meet specific criteria before the claim can be used.

The exact rule depends on the country.

This is especially important when comparing US and European food labels because US labels generally declare sodium, while European Union labels declare salt.

What does low sodium mean in the United States?

Under US food-labeling rules, a food described as low sodium generally must contain 140 mg of sodium or less per reference amount customarily consumed.

For meals and main dishes, additional criteria can apply based on the labeled serving.

This means the words "low sodium" have a defined regulatory meaning.

They are different from simply noticing that one product contains less sodium than another.

Is 140 mg of sodium always the cutoff?

The familiar 140 mg threshold is useful, but it should not be applied blindly to every labeling situation.

US nutrient-content claims are defined using regulatory serving concepts such as the reference amount customarily consumed, often abbreviated RACC.

Special rules can apply to:

• foods with very small reference amounts;
• meals;
• main dishes;
• products using comparative claims.

Therefore, when checking whether a specific commercial product legally qualifies for a claim, the complete applicable labeling rule matters.

For ordinary label reading, however, 140 mg or less is the key number associated with the standard US "low sodium" claim.

Low sodium is not the same as sodium free

These claims have different meanings.

A product labeled sodium free or salt free in the United States generally must contain less than 5 mg sodium per reference amount and meet the applicable conditions for the claim.

That is far below the standard low-sodium threshold.

So:

• sodium free is a much stricter claim;
• low sodium allows some sodium;
• neither term simply means "less than another product."

What does very low sodium mean?

The United States also recognizes a very low sodium claim.

The standard threshold is generally 35 mg sodium or less per reference amount customarily consumed, subject to the applicable labeling conditions.

This creates a useful distinction:

These values refer to regulated claim conditions rather than personal daily sodium targets.

What does reduced sodium mean?

Reduced sodium is a comparative claim.

It does not mean the same thing as low sodium.

In the United States, a reduced-sodium product generally needs to contain at least 25% less sodium per reference amount than an appropriate reference food.

For example, imagine:

• regular soup: 800 mg sodium per reference amount;
• reduced-sodium soup: 580 mg.

The reduction is:

800 - 580 = 220 mg

220 ÷ 800 × 100 = 27.5%

The reduced version may therefore satisfy the percentage concept for a reduced-sodium claim even though 580 mg is nowhere near the 140 mg low-sodium threshold.

This is one of the most important distinctions when reading the front of a package.

Reduced sodium does not necessarily mean low sodium

A product can contain substantially less sodium than its regular version while still containing a relatively large amount.

Consider another example:

The reduced version contains 30% less sodium.

But 700 mg is still five times 140 mg.

Therefore, "reduced sodium" should not be interpreted as another way of saying "low sodium."

What about "light in sodium"?

In US labeling, claims involving "light" or "lite" and sodium have their own conditions.

The important practical lesson is that terms such as:

• low sodium;
• reduced sodium;
• very low sodium;
• sodium free;
• light in sodium

are not interchangeable.

When a front-of-package claim matters to you, read the actual Nutrition Facts panel as well.

Why European labels look different

Food labels in the European Union normally declare salt, not sodium, in the mandatory nutrition declaration.

This can make US and European products look difficult to compare.

Sodium and salt are related, but they are not the same quantity.

For labeling calculations:

salt ≈ sodium × 2.5

when both values use the same mass unit.

Conversely:

sodium ≈ salt ÷ 2.5

EU low-sodium and low-salt claims

Under EU nutrition-claim rules, a food can generally carry a low sodium/salt claim only if it contains no more than:

• 0.12 g sodium per 100 g or 100 ml, or
• the equivalent value for salt.

Because salt is calculated as sodium × 2.5:

0.12 g sodium × 2.5 = 0.30 g salt

So the general EU threshold corresponds to approximately:

0.12 g sodium or 0.30 g salt per 100 g/100 ml

Different provisions can apply to certain waters, so this general food threshold should not be applied indiscriminately to every product category.

EU very low sodium and salt

The EU also defines a very low sodium/salt claim.

For eligible foods, the general threshold is no more than:

• 0.04 g sodium per 100 g or 100 ml, or
• the equivalent amount of salt.

Conversion:

0.04 g sodium × 2.5 = 0.10 g salt

So the corresponding salt value is approximately 0.10 g per 100 g or 100 ml.

This claim is not permitted for all categories of food, so the regulatory context still matters.

EU sodium-free and salt-free claims

A sodium-free/salt-free claim in the EU generally requires no more than:

• 0.005 g sodium per 100 g, or
• the equivalent amount of salt.

0.005 g sodium equals 5 mg sodium.

Converted to salt:

0.005 × 2.5 = 0.0125 g salt

Again, these are regulatory claim thresholds rather than recommendations for how much an individual should eat.

US and EU thresholds are not directly structured the same way

This is an important source of confusion.

The US standard low-sodium claim generally uses sodium per reference amount customarily consumed.

The EU general low-sodium/low-salt claim uses sodium or salt per 100 g or 100 ml.

Those are different measurement bases.

For example, suppose a food contains:

110 mg sodium per 100 g

In EU-style terms:

110 mg = 0.11 g sodium

0.11 × 2.5 = 0.275 g salt per 100 g

That is below the general EU threshold of 0.30 g salt per 100 g.

But determining how the same product fits a US claim requires considering the applicable reference amount, not simply copying the EU per-100-g calculation.

Sodium vs salt: a worked example

Suppose a European label says:

Salt: 1.2 g per 100 g

Estimated sodium:

1.2 ÷ 2.5 = 0.48 g sodium

0.48 g = 480 mg sodium

So 1.2 g salt corresponds to approximately 480 mg sodium.

Do not read "1.2 g salt" as "1.2 g sodium."

Another example

A US label lists:

Sodium: 200 mg

Convert milligrams to grams:

200 mg = 0.2 g

Then convert sodium to salt equivalent:

0.2 × 2.5 = 0.5 g salt equivalent

This conversion is useful when comparing products whose labels use different systems.

Why the salt conversion uses 2.5

Table salt is primarily sodium chloride.

Sodium represents only part of the mass of sodium chloride.

For nutrition labeling purposes, the standard conversion commonly used is:

salt = sodium × 2.5

This provides a practical relationship between declared sodium and salt values.

It does not mean that every source of sodium in food exists only as table salt.

What if the package says "no added salt"?

No added salt is not the same as sodium free.

A food can naturally contain sodium even if no salt was added during production.

Some ingredients can also contribute sodium.

Therefore, a package saying "no added salt" should not automatically be interpreted as containing zero sodium.

Check the nutrition declaration.

What if a product tastes salty but has no low-sodium claim?

Taste is not a reliable quantitative measurement of sodium.

Different foods have different flavor profiles, serving sizes and formulations.

Likewise, a food that does not taste especially salty can still contribute meaningful sodium.

The nutrition label is more useful than taste for comparing amounts.

Compare products on the same basis

When choosing between two products, make sure you are comparing the same unit.

For example:

Product A:

• 120 mg sodium per 30 g serving.

Product B:

• 180 mg sodium per 50 g serving.

Looking only at the serving numbers makes Product A appear lower.

But per 100 g:

Product A:

120 ÷ 30 × 100 = 400 mg sodium per 100 g

Product B:

180 ÷ 50 × 100 = 360 mg sodium per 100 g

Product B actually contains less sodium per equal weight.

This does not automatically make Product B the better choice, because the amount you actually eat also matters.

Per 100 g and per serving answer different questions

A per-100-g value is useful for comparing the concentration of sodium or salt between similar foods.

A per-serving value helps estimate how much you will actually consume.

For example, a condiment may contain a high amount of sodium per 100 g but normally be eaten in a small quantity.

A soup may contain a lower concentration per 100 g but be consumed in a much larger portion.

Both perspectives can be useful.

Front-of-package claims do not replace the nutrition panel

A claim such as "low sodium" provides one piece of information.

The nutrition panel can tell you:

• the actual sodium or salt amount;
• the measurement basis;
• the serving size;
• how the product compares with another food.

This is particularly important with comparative claims such as reduced sodium.

Does low sodium mean healthy?

No single nutrient-content claim determines the overall nutritional quality of a food.

A low-sodium product can still differ substantially in:

• calories;
• saturated fat;
• sugars;
• fiber;
• protein;
• micronutrients;
• portion size.

Similarly, a food that does not qualify for a low-sodium claim is not automatically an unhealthy food.

A claim describes a specific characteristic under defined conditions.

Does everyone need a low-sodium diet?

A regulated food-label claim and an individual's dietary needs are different issues.

"Low sodium" describes the product according to labeling criteria.

It does not determine the appropriate sodium intake for a particular person.

Individual requirements can depend on overall diet, health conditions and medical advice.

If you have been given a specific sodium restriction by a healthcare professional, follow that personalized guidance rather than relying only on front-of-package wording.

Practical example: choosing soup

Imagine two soups.

Soup A

• 130 mg sodium per relevant serving basis;
• labeled low sodium.

Soup B

• 480 mg sodium;
• labeled reduced sodium because the original version contained much more.

Soup B may legitimately be reduced sodium while still containing considerably more sodium than Soup A.

This is why the exact number matters.

Practical example: European bread

Suppose bread contains:

0.90 g salt per 100 g

Estimated sodium:

0.90 ÷ 2.5 = 0.36 g sodium

0.36 g = 360 mg sodium per 100 g

This exceeds the general EU low-salt threshold of 0.30 g salt per 100 g.

The product may still fit normally into someone's diet, but it would not qualify for the general low-salt claim solely on that value.

Practical example: serving size

Suppose a product contains:

0.25 g salt per 100 g

You eat 250 g.

Salt consumed:

0.25 × 2.5 = 0.625 g salt

The per-100-g concentration qualifies for comparison purposes, while the amount actually consumed depends on your portion.

This demonstrates why claim thresholds and personal intake calculations are separate questions.

A simple label-reading process

When sodium or salt matters to you:

1. Check whether the label reports sodium or salt.
2. Check whether the value is per serving, per 100 g or per 100 ml.
3. Read the actual number instead of relying only on the front claim.
4. Distinguish low from reduced.
5. Compare similar products using the same measurement basis.
6. Consider the amount you actually expect to eat.
7. If comparing sodium with salt, convert the values before comparing them.

This approach avoids many common label-reading errors.

Quick reference

For standard US labeling, the commonly used claim levels include:

For general EU food claims:

Specific product categories and claim conditions can have additional rules.

The key distinction

The most important thing to remember is that low sodium and reduced sodium answer different questions.

Low sodium means the food meets a defined maximum level under the applicable labeling rules.

Reduced sodium means the product contains sufficiently less sodium than a reference version.

A product can therefore be reduced in sodium without being low in sodium.

And when comparing labels from different countries, first check whether the package reports sodium or salt and whether the value is expressed per serving or per 100 g.