Most health authorities set the upper limit for sodium at 2,300 mg per day, which equals about one teaspoon of table salt. The World Health Organization recommends even less: under 2,000 mg of sodium daily. The global average intake is 4,310 mg per day, and Americans average about 3,400 mg. In other words, most people are already consuming well past what’s considered safe.
The Numbers That Matter
Sodium and salt aren’t the same thing, which is where confusion starts. Table salt is about 40% sodium by weight, so 5 grams of salt contains roughly 2,000 mg of sodium. When nutrition labels list sodium content, you can multiply by 2.5 to get the equivalent amount of table salt. The limits that matter for your health are measured in sodium, not salt.
For most adults, staying under 2,300 mg of sodium per day is the standard recommendation in the U.S. The WHO sets a slightly stricter target of under 2,000 mg. People with high blood pressure or kidney disease are often advised to aim for 1,500 mg or less. To put that in perspective, a single deli meat sandwich can contain 1,000 mg or more, which means one lunch could eat up half your daily budget.
What Excess Sodium Does to Your Body
When you eat more sodium than your body needs, your kidneys hold onto extra water to dilute it. That fluid expansion increases the volume of blood flowing through your arteries, which raises blood pressure. Over time, this forces your heart to work harder and puts stress on the walls of your blood vessels.
The process goes deeper than simple fluid retention. Excess sodium triggers a chain reaction in blood vessel walls. Your body releases compounds that reduce the ability of smooth muscle cells lining your arteries to relax. The result is blood vessels that stay constricted, adding even more resistance to blood flow on top of the increased fluid volume. This is why high sodium intake raises blood pressure through two routes simultaneously: more fluid and tighter arteries.
In the short term, a high-sodium meal can leave you feeling bloated, puffy, and unusually thirsty. Rings may feel tight on your fingers, and you might notice swelling in your ankles. These effects are temporary, but they reflect the same fluid-retention mechanism that causes lasting damage when sodium stays consistently high.
Long-Term Health Risks
The cardiovascular consequences of sustained high sodium intake are well documented. Meta-analyses comparing people with the highest sodium intake to those with the lowest found a 24% greater risk of stroke and a 32% greater risk of fatal coronary events. A separate analysis that specifically compared high intake (above 5,000 mg per day) to moderate intake (2,700 to 5,000 mg) found increased risks across the board: 18% higher for stroke, 17% higher for heart disease, and 16% higher for death from any cause.
Kidney health suffers too. High sodium forces the kidneys to work harder filtering the extra fluid, accelerating decline in people whose kidney function is already compromised. For people with kidney disease, excess sodium can cause dangerous fluid buildup around the heart and lungs, and it makes dialysis more uncomfortable and less effective.
Salt Sensitivity Varies Widely
Not everyone’s blood pressure responds to sodium the same way. Roughly 50% of people with high blood pressure and 25% of people with normal blood pressure are considered “salt-sensitive,” meaning their blood pressure rises noticeably when sodium intake goes up. For salt-sensitive individuals, swinging from a high-salt to a low-salt diet can shift blood pressure by 8 to 10 points or more.
There’s no routine test for salt sensitivity in standard medical practice. The diagnostic method involves alternating between a week of high-salt eating and a week of low-salt eating while tracking blood pressure changes. Since most people don’t know their sensitivity status, the general guidelines are designed to protect everyone, including those most vulnerable to sodium’s effects.
Where the Sodium Actually Comes From
The salt shaker on your table isn’t the main problem. About 40% of the sodium Americans consume comes from just ten food categories, and most of them don’t taste particularly salty. CDC data from national dietary surveys ranked the top contributors:
- Deli meat sandwiches (6.3% of total sodium intake)
- Pizza (5.4%)
- Burritos and tacos (5.3%)
- Soups (4.1%)
- Savory snacks like chips, crackers, and popcorn (3.8%)
- Poultry excluding nuggets and tenders (3.7%)
- Pasta dishes (3.0%)
- Vegetables excluding potatoes (2.9%)
- Burgers (2.8%)
- Eggs and omelets (2.7%)
Vegetables making this list surprises most people, but canned and frozen vegetables often come with added sodium for preservation and flavor. Poultry is another hidden source because raw chicken and turkey are frequently injected with salt solutions before packaging. The sodium is baked into the food supply long before it reaches your plate.
How to Read Sodium Labels
Food packaging uses specific terms that correspond to exact thresholds set by the FDA. “Sodium-free” means fewer than 5 mg per serving. “Very low sodium” means 35 mg or less per serving. “Reduced sodium” only means the product has at least 25% less sodium than the original version, which can still be a lot if the original was sodium-heavy. A “reduced sodium” soy sauce, for example, might still pack over 500 mg per tablespoon.
The most practical habit is checking the milligram count on the nutrition facts panel rather than relying on front-of-package claims. If a single serving delivers more than 600 mg, that item alone is eating up a quarter or more of your daily limit. Comparing brands of the same product often reveals surprising differences: one jar of pasta sauce might have twice the sodium of the one sitting next to it on the shelf.
Practical Ways to Cut Back
Since processed and restaurant foods account for the vast majority of sodium intake, cooking at home with whole ingredients is the single most effective strategy. Fresh meat, raw vegetables, dried beans, and plain grains contain minimal sodium naturally. When you control what goes into the pan, you can season food with salt intentionally rather than absorbing it passively from packaged products.
Swapping canned goods for fresh or frozen (no-salt-added) versions eliminates a major hidden source. Rinsing canned beans under running water for 30 seconds removes roughly a third of the added sodium. Choosing unsalted nuts, making salad dressings from scratch, and seasoning with acid (lemon, vinegar) or spices instead of reaching for the salt shaker all reduce intake without making food taste bland. Your palate adjusts within a few weeks, and foods that once tasted normal start to taste noticeably salty.