Most adults should consume less than 2,300 milligrams of sodium per day, which is the amount in one teaspoon of table salt. That’s the federal guideline for teens and adults. The American Heart Association goes further, calling 1,500 mg per day the ideal limit for most adults, particularly those with high blood pressure.
What the Numbers Actually Mean
The 2,300 mg ceiling is the standard recommendation from the CDC and federal dietary guidelines. But the American Heart Association treats that number as a maximum, not a target, and recommends most adults aim for 1,500 mg instead. The gap between those two numbers is where most of the practical decision-making lives: if you’re generally healthy and don’t have blood pressure concerns, staying under 2,300 mg is a reasonable goal. If you have high blood pressure, heart disease, or are over 50, the lower target is worth pursuing.
To put those numbers in kitchen terms:
- 1/4 teaspoon of salt = 575 mg sodium
- 1/2 teaspoon = 1,150 mg
- 1 teaspoon = 2,300 mg (the full daily limit)
That teaspoon sounds like a lot until you realize it includes everything in your food, not just what you shake on at the table. Most sodium in the average diet comes from packaged and restaurant foods, not from your salt shaker.
Limits for Children
Kids need significantly less sodium than adults, and the limits rise with age. Mayo Clinic Health System outlines the daily maximums for children:
- Ages 1 to 3: less than 1,200 mg
- Ages 4 to 8: less than 1,500 mg
- Ages 9 to 13: less than 1,800 mg
Once teens hit 14, they follow the standard adult guideline of less than 2,300 mg.
Your Body’s Actual Need Is Surprisingly Low
Your body requires sodium for nerve signaling, muscle contraction, and maintaining fluid balance. But the amount it needs to do all of that is a fraction of what most people eat. A healthy, active adult needs only 200 to 500 mg of sodium per day to cover basic physiological functions. That’s less than a quarter teaspoon of salt.
The wide gap between what your body requires (a few hundred milligrams) and what guidelines allow (2,300 mg) exists because guidelines are meant to be realistic. They account for the fact that sodium is in virtually everything and that an extremely low-sodium diet is difficult to maintain. The goal isn’t to hit 200 mg. It’s to keep your intake in a range where it won’t cause harm.
Why Excess Sodium Raises Blood Pressure
When you eat more sodium than your body needs, the excess triggers a chain of events that tightens your blood vessels. High sodium levels in your bloodstream signal your brain to increase nerve activity that causes blood vessels to constrict. At the same time, your kidneys hold onto extra water to dilute the sodium, which increases the volume of blood flowing through those now-narrower vessels. The combination of more fluid and tighter pipes pushes blood pressure up.
Over time, this process does more than temporarily raise your numbers. Sustained high sodium intake can actually remodel the walls of your arteries, making them stiffer and narrower. That structural change makes high blood pressure harder to reverse even after you cut back on salt.
How Much Blood Pressure Drops When You Cut Back
Reducing sodium intake produces measurable blood pressure improvements. A WHO meta-analysis covering thousands of participants found that a modest reduction in salt intake lowered systolic blood pressure (the top number) by about 4 mmHg and diastolic (the bottom number) by about 2 mmHg on average.
The effect is larger for people who already have high blood pressure. In that group, the same level of salt reduction dropped systolic pressure by roughly 5.4 mmHg and diastolic by about 2.8 mmHg. Even people with normal blood pressure saw a benefit: about 2.4 mmHg off the top number. Those reductions may sound small, but at a population level, a 4 to 5 point drop in systolic pressure significantly reduces the risk of stroke and heart disease over time.
Athletes and Heavy Sweaters
If you exercise intensely or work in hot conditions, your sodium needs can genuinely be higher than the general population’s. You lose sodium in sweat, and people vary widely in how much they lose. Some people have relatively dilute sweat, while others lose concentrated amounts of sodium, especially during long or intense sessions.
The National Athletic Trainers’ Association recommends that athletes replace sodium based on their individual sweat losses rather than following a blanket rule. Consuming sodium before exercise can help expand blood volume, and taking in sodium during prolonged activity helps delay drops in blood sodium levels. But the key word is “replace,” not “load.” There’s no evidence that supplementing sodium beyond what you actually lose offers any benefit, and drinking too much fluid without enough sodium during exercise lasting an hour or more can dilute blood sodium to dangerous levels, a condition called exercise-associated hyponatremia.
If you’re a recreational exerciser doing moderate workouts, you likely don’t need extra sodium beyond what’s in your normal meals. The athletes who benefit most from deliberate sodium replacement are those with high sweat rates (above 2.5 liters per hour) or unusually salty sweat.
Reading Sodium on Food Labels
Nutrition labels list sodium in milligrams per serving, which makes tracking straightforward if you pay attention to serving sizes. The FDA also regulates what terms like “low sodium” actually mean on packaging:
- Low sodium: 140 mg or less per serving
- Very low sodium: 35 mg or less per serving
These definitions are legally enforced, so a product labeled “low sodium” can’t exceed 140 mg per serving. That said, “reduced sodium” is a different claim. It only means the product has 25% less sodium than the original version, which can still be quite high. A “reduced sodium” soy sauce, for example, might still contain 500 or 600 mg per tablespoon.
The percent daily value on labels is based on the 2,300 mg limit. So if a single serving shows 20% DV for sodium, that’s about 460 mg, roughly a fifth of your daily budget. Scanning this percentage is often faster than doing the math on milligrams, especially when you’re comparing products in the grocery aisle. As a general rule, 5% DV or less per serving is considered low, and 20% or more is high.
Practical Ways to Stay in Range
Most people get the majority of their sodium not from cooking at home but from bread, deli meats, pizza, canned soups, cheese, and restaurant meals. A single fast-food sandwich can contain 1,000 to 1,500 mg of sodium, consuming half to two-thirds of your daily limit in one sitting. Canned soups often contain 700 to 900 mg per serving, and many cans hold two servings.
Cooking at home gives you the most control. When you do buy packaged foods, comparing brands helps more than you might expect. Sodium content varies dramatically between brands of the same product. One brand of canned tomatoes might have 300 mg per serving while another has 50 mg. Rinsing canned beans and vegetables under water removes a meaningful portion of the added sodium. Seasoning with acids like lemon juice or vinegar, along with herbs and spices, can reduce how much salt you feel you need without making food taste bland.