How Much Sodium Per Day: Limits by Age and Health

Most healthy adults are advised to consume no more than 2,300 milligrams of sodium per day, which works out to roughly one teaspoon of table salt. That number, drawn from the Dietary Guidelines for Americans, serves as the general upper limit, but it shifts depending on your age, your blood pressure, and whether you have certain chronic conditions. The picture is also less simple than “less is always better,” because going extremely low carries its own risks.

Why Your Body Needs Sodium in the First Place

Sodium has a bad reputation, but your body cannot function without it. It is one of the main ions responsible for maintaining fluid balance, transmitting nerve signals, and keeping muscles contracting the way they should. The appetite for salt appears to be built in rather than learned. Maintaining sodium within a normal range is not just helpful but essential for survival, and it plays a central role in the balance between fluids and minerals throughout the body.¹ The problem is not that sodium exists in your diet. The problem is that most people consume far more than their body actually needs to maintain those functions.

General Daily Limits for Adults

The widely cited ceiling of 2,300 mg per day for adults comes from the Dietary Guidelines for Americans and is endorsed by most major health organizations. That figure is meant for healthy adults without diagnosed blood pressure problems. If you already have high blood pressure, the American Heart Association recommends aiming lower, closer to 1,500 mg per day. Both thresholds are meant as upper limits, not targets. Your body needs far less sodium than either number to carry out its basic work, somewhere in the range of 500 mg per day under normal conditions.

For context, the average American eats well over 3,400 mg of sodium per day. That is roughly 50 percent more than the general limit and more than double the stricter recommendation for people with hypertension. This gap between what guidelines recommend and what people actually eat is the core of the public health concern.

How Sodium Recommendations Differ for Children

Children need less sodium than adults, and the limits are lower at every age. For toddlers between one and three years old, the recommended upper limit is about 1,200 mg per day. For children aged four to eight, it rises to about 1,500 mg. Kids between nine and thirteen are generally advised to stay under 1,800 mg per day, and teenagers can follow the adult ceiling of 2,300 mg. These numbers reflect the fact that children have smaller bodies and developing kidneys that process sodium less efficiently.

What makes this tricky in practice is that children’s diets are increasingly loaded with the same processed and packaged foods that drive sodium intake in adults. School lunches, fast food, snack crackers, and flavored drinks can push a child’s daily sodium well past the recommended limits without anyone adding salt to anything at the table. Parents who focus solely on the salt shaker often miss the larger problem.

Where the Sodium Actually Comes From

If you think your sodium intake is mostly about how much salt you sprinkle on dinner, you are looking in the wrong place. More than 70 percent of the sodium in the average American diet comes from processed, packaged, and prepared foods, not from salt added during cooking or eating at home.² That includes bread, deli meats, canned soups, frozen meals, cheese, condiments, and restaurant food. Even foods that do not taste salty can be significant contributors. A single slice of white bread contains around 100 to 200 mg of sodium, and you eat several slices throughout the day without thinking of bread as a “salty” food.

This reality has major implications for how you manage your intake. Putting away the salt shaker is a fine idea, but it will barely dent your total if you are still eating a lot of packaged food. Reading nutrition labels and paying attention to serving sizes matters far more. The FDA has been working with food manufacturers to encourage voluntary sodium reduction in commercial products precisely because individual willpower at the dinner table cannot solve a problem that is baked into the food supply itself.²

What Happens When You Eat Too Much

Excessive sodium intake is one of the best-established modifiable risk factors for high blood pressure and cardiovascular disease.³ The mechanism is straightforward: when sodium levels in your blood rise, your body retains more water to dilute it. That extra fluid increases the volume of blood moving through your vessels, which pushes blood pressure up. Over months and years, sustained high blood pressure damages artery walls, strains the heart, and increases the risk of stroke, heart attack, kidney disease, and heart failure.

The relationship between sodium and blood pressure is not binary. It is not as though you are fine at 2,299 mg and in danger at 2,301 mg. The effect is more of a gradient. The more sodium you consume on a regular basis, the higher your average blood pressure tends to be, and reducing intake tends to bring it down. Research across randomized controlled trials consistently shows that cutting sodium lowers blood pressure in people who already have hypertension and, to a lesser degree, in people with normal blood pressure.³ That does not mean everyone responds identically, though. Some people are more “salt-sensitive” than others, meaning their blood pressure climbs more steeply with the same increase in sodium. Salt sensitivity is more common in older adults, Black Americans, and people with existing kidney problems.

People With Specific Health Conditions

The general 2,300 mg guideline is just that: general. Several conditions push the recommended limit substantially lower.

Hypertension: If you have been diagnosed with high blood pressure, most cardiologists recommend staying at or below 1,500 mg per day. The blood pressure benefits of sodium reduction are most pronounced in this group.
Heart failure: Fluid overload is one of the central dangers in heart failure, and sodium directly influences fluid retention. Patients with heart failure are typically advised to keep sodium intake well below the standard adult ceiling, though the ideal target is an area of ongoing debate among researchers.
Chronic kidney disease: Damaged kidneys are less efficient at filtering excess sodium, which accelerates fluid retention and blood pressure problems. Nephrologists often recommend limits in the range of 1,500 to 2,000 mg per day depending on the stage of kidney disease.
Diabetes: People with diabetes face higher cardiovascular risk to begin with. Because sodium reduction helps manage blood pressure and cardiovascular risk, the same lower targets recommended for hypertension are generally applied to people with diabetes as well.

If you have any of these conditions, the general advice to “eat less salt” is not specific enough. You should discuss an actual daily target with your doctor, because the number that makes sense for you depends on your medications, kidney function, and overall cardiovascular picture.

The Risks of Going Too Low

Here is where the conversation gets more complicated than most public health messaging suggests. While the dangers of too much sodium are well documented, going extremely low is not without consequences either. Research has found that very low sodium diets can adversely affect insulin resistance, blood lipid levels, and the hormonal pathways that regulate blood pressure and fluid balance. These effects may increase the risk of new metabolic problems, worsen existing cardiovascular conditions, and in some studies have been associated with higher rates of cardiovascular events and death rather than lower ones.⁴

This does not mean you should ignore sodium guidelines. Most people are nowhere near the “too low” zone and are instead consuming well above the recommended ceiling. But it does mean that an aggressive push to cut sodium as close to zero as possible is not automatically healthier. The body needs a baseline amount of sodium to function, and when intake drops far below that, compensatory hormonal responses kick in that can create problems of their own. The relationship looks more like a U-shaped or J-shaped curve: harm at both extremes, with the lowest risk somewhere in the middle. Where exactly the bottom of that curve sits is still debated, but the evidence is strong enough that extremely restrictive sodium diets should not be adopted casually, especially by older adults, athletes, or people taking certain medications like diuretics.

Why “Salt Sensitivity” Varies So Much Between People

One of the reasons sodium recommendations feel imprecise is that individual responses to dietary sodium vary enormously. Two people can eat the same amount of sodium and see very different effects on blood pressure. This phenomenon, called salt sensitivity, is partly genetic, partly tied to kidney function, and partly influenced by other dietary factors like potassium intake.

Potassium deserves special mention because it acts as a counterbalance to sodium. When potassium intake is adequate, the kidneys excrete sodium more efficiently, and blood pressure tends to be lower. Most Americans do not get enough potassium either, which means the sodium-to-potassium ratio in their diet is doubly skewed. Increasing potassium through foods like bananas, potatoes, spinach, and beans can blunt some of the blood pressure effects of a higher-sodium diet. That does not mean extra potassium gives you a free pass to eat unlimited sodium, but it does mean that focusing exclusively on cutting sodium while ignoring potassium tells only half the story.

Age is another major factor. As you get older, your kidneys become less efficient at handling sodium, and your blood vessels stiffen. Both changes make older adults more susceptible to the blood pressure effects of sodium. This is part of why stricter sodium targets are often recommended for people over 50 or 60, even if they have not been formally diagnosed with hypertension.

Practical Ways to Actually Reduce Sodium

Knowing the number is one thing. Staying under it is another. Because the vast majority of sodium comes from processed and prepared foods rather than from the salt shaker,² the most effective strategy is to shift the balance of what you eat rather than obsessing over seasoning.

Cook more at home: Home-cooked meals almost always contain less sodium than restaurant or packaged equivalents, even if you salt your food while cooking. You have control over every ingredient.
Read labels for sodium per serving: A food labeled “low fat” or “heart healthy” can still be loaded with sodium. The nutrition facts panel is the only reliable guide. Look at the milligram count and the percent daily value, and pay attention to serving size. A can of soup that appears to have 800 mg might actually list two servings per can, meaning the full can delivers 1,600 mg.
Rinse canned foods: Draining and rinsing canned beans, vegetables, and tuna under water can remove roughly 30 to 40 percent of the added sodium.
Use herbs and acid instead of salt: Lemon juice, vinegar, garlic, and fresh herbs add flavor without sodium. Your palate adjusts to lower salt levels within a couple of weeks, and foods that once tasted bland start tasting normal.
Watch condiments: Soy sauce, ketchup, salad dressing, hot sauce, and barbecue sauce are among the most concentrated sodium sources in many people’s diets. A single tablespoon of soy sauce contains about 900 mg of sodium.

Tracking your intake for even a few days using a food diary or a nutrition app can be eye-opening. Most people are genuinely surprised by where their sodium is coming from and how quickly it adds up, since the biggest contributors are often foods they never thought of as salty.

What “Low Sodium” on a Food Label Actually Means

Food labeling terms related to sodium are regulated by the FDA, but they can still be misleading if you do not know what the thresholds are. “Sodium free” means fewer than 5 mg per serving. “Very low sodium” means 35 mg or less per serving. “Low sodium” means 140 mg or less per serving. “Reduced sodium” means 25 percent less sodium than the original version of that product, which can still be a lot if the original was extremely high.

The phrase “no salt added” only means that no salt was added during processing. It does not mean the food contains no sodium, because sodium occurs naturally in many ingredients. A can of tomatoes labeled “no salt added” still contains some sodium from the tomatoes themselves. These distinctions matter if you are trying to stay under a tight daily limit, especially if a doctor has told you to aim for 1,500 mg or below. In that scenario, even “low sodium” products at 140 mg per serving can add up fast across a full day of eating.

Sodium and Exercise

If you exercise heavily or work in hot conditions, your sodium needs shift upward. Sweat contains sodium, and prolonged sweating can lead to meaningful losses. Endurance athletes, outdoor laborers, and people exercising for more than an hour in heat may need to replace sodium during and after activity to avoid a dangerous drop in blood sodium called hyponatremia. Symptoms include nausea, headache, confusion, and in severe cases, seizures.

This is one scenario where the standard advice to minimize sodium can actually backfire. Drinking large volumes of plain water during extended exercise without replacing electrolytes dilutes blood sodium further. Sports drinks, electrolyte tablets, or lightly salted snacks help maintain balance. The amount needed depends on your sweat rate, the temperature, and how long you are exercising, so there is no single number that applies to everyone. But if you are training for a marathon or working a physically demanding outdoor job in summer, your 2,300 mg ceiling is almost certainly too low for that day. Your body is telling you the truth when it craves something salty after a long, sweaty effort.¹

1
National Center for Biotechnology Information / PubMed Central. Sodium Homeostasis, a Balance Necessary for Life
2
U.S. Food and Drug Administration. Sodium Reduction in the Food Supply
3
Oxford Academic. Association Between Changes in Salt Intake and Blood Pressure: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
4
Elsevier / PubMed Central. Dietary sodium restriction: take it with a grain of salt