Most health authorities recommend consuming less than 5,000 milligrams (5 grams) of salt per day, which equals about one teaspoon. That’s the World Health Organization guideline for adults. In the United States, federal dietary guidelines frame the limit differently, focusing on sodium (the component of salt that affects blood pressure) at less than 2,300 milligrams per day. Since salt is about 40% sodium by weight, these two numbers describe roughly the same thing.
Salt vs. Sodium: A Quick Conversion
Nutrition labels list sodium, not salt. This trips people up because the two numbers are very different. To convert sodium to salt, multiply the sodium value by 2.5. So 2,300 mg of sodium equals about 5,750 mg of salt. Going the other direction, if a recipe lists salt in grams, divide by 2.5 to get the sodium content.
The daily limits most people reference:
- WHO guideline: less than 5,000 mg of salt (less than 2,000 mg of sodium)
- U.S. federal guideline: less than 2,300 mg of sodium (about 5,750 mg of salt)
- For people with high blood pressure or kidney disease: less than 1,500 mg of sodium (about 3,750 mg of salt)
How Much Your Body Actually Needs
Your body requires far less sodium than most people consume. A healthy, active adult needs between 200 and 500 mg of sodium per day, just enough to maintain nerve signaling and fluid balance. That’s roughly the amount in a single slice of bread. Everything above that minimum is essentially surplus your kidneys have to process and excrete.
The average American consumes about 3,266 mg of sodium daily, well over the recommended ceiling. Most of that sodium doesn’t come from a salt shaker. It’s already embedded in food before it reaches your plate.
Why Excess Salt Raises Blood Pressure
When you eat more sodium than your body needs, your kidneys temporarily hold onto extra water to keep the sodium concentration in your blood balanced. That extra fluid increases your blood volume, which puts more pressure on your artery walls. In most healthy people, the body compensates by relaxing blood vessels to offset the higher volume. But in people whose blood vessels don’t adjust as well (a group that grows larger with age), the extra pressure stays elevated. Over time, this sustained pressure damages artery walls and strains the heart.
The relationship is dose-dependent. Every additional 1,000 mg of daily sodium is associated with an 18% increase in cardiovascular disease risk. Potassium works in the opposite direction: every additional 1,000 mg of potassium per day is linked to an 18% lower risk. This means the ratio between the two minerals matters as much as the raw sodium number. Eating more potassium-rich foods (bananas, potatoes, beans, leafy greens) can partially counterbalance a higher sodium intake.
Where the Salt Is Hiding
The biggest contributors to sodium in the modern diet aren’t the foods you’d expect. Bread and rolls account for 7.4% of daily sodium intake, more than any other single food category. That’s not because bread is especially salty per serving, but because people eat it so frequently. The rest of the top five: cold cuts and cured meats (5.1%), pizza (4.9%), poultry including processed chicken products (4.5%), and soups (4.3%).
Together, just ten food categories supply 44% of the sodium in the average diet. Cheese, pasta dishes, sandwiches, meat dishes, and salty snacks like chips round out the list. The pattern is clear: processed, prepared, and restaurant foods do the heavy lifting. A single can of soup can contain 800 to 1,000 mg of sodium, nearly half the WHO’s daily limit, before you’ve eaten anything else.
The FDA has been pushing food manufacturers to voluntarily reduce sodium levels in 163 commercial food categories. If their Phase II targets are met, average intake would drop to about 2,750 mg per day, a roughly 20% reduction from previous levels. That’s still above the ideal, but it reflects how deeply sodium is built into the food supply.
Lower Limits for Specific Conditions
If you have high blood pressure or chronic kidney disease, the recommended ceiling drops to 1,500 mg of sodium per day (about 3,750 mg of salt). At that level, reducing sodium intake measurably lowers blood pressure and can slow the progression of kidney disease. Hitting 1,500 mg requires deliberate effort: cooking most meals at home, reading every nutrition label, and choosing low-sodium versions of canned and packaged foods.
Sodium Needs During Heavy Exercise
Athletes and people who sweat heavily are the one group that may need more sodium than the standard guidelines suggest. Sweat contains between 400 and 700 mg of sodium per liter, and endurance athletes can lose well over a liter per hour. For long runs, rides, or races with heavy sweat losses, sports nutrition guidelines suggest replacing about 1,000 mg of sodium per hour of exercise. This is a short-term replacement strategy for acute losses, not a reason to increase your baseline daily intake. On rest days and light-activity days, the standard guidelines still apply.
Practical Ways to Track Your Intake
Reading nutrition labels is the single most effective habit for managing sodium. The “% Daily Value” on U.S. labels is based on 2,300 mg, so a food showing 20% DV contains about 460 mg of sodium per serving. Watch serving sizes carefully. A frozen meal might list 600 mg per serving but contain two servings in the package.
When cooking at home, one level teaspoon of table salt contains about 2,300 mg of sodium. Measuring your salt rather than shaking freely gives you a concrete sense of how quickly it adds up. Seasoning with acids (lemon juice, vinegar), spices, garlic, and herbs can reduce how much salt you need without making food taste bland. Your taste buds adapt within a few weeks of eating less salt, and foods that once seemed normal will start tasting noticeably salty.