Most heart patients should aim for less than 1,500 mg of sodium per day, roughly two-thirds of a teaspoon of table salt. That’s the guideline from both the American College of Cardiology and the American Heart Association for people with cardiovascular disease. For the general adult population, the limit is higher at 2,300 mg per day, but a heart condition moves you into stricter territory.
The Numbers That Matter
The 2025 ACC/AHA blood pressure guidelines recommend that adults with or without hypertension reduce sodium to under 2,300 mg per day, moving toward an ideal limit of under 1,500 mg per day. If you already have heart disease, 1,500 mg is your target, not the stretch goal.
To put those numbers in perspective:
- 1/4 teaspoon of salt = 575 mg sodium
- 1/2 teaspoon of salt = 1,150 mg sodium
- 3/4 teaspoon of salt = 1,725 mg sodium
- 1 teaspoon of salt = 2,300 mg sodium
At 1,500 mg per day, you’re working with just over half a teaspoon of salt total, and that includes the sodium already in everything you eat, not just what you sprinkle on food.
Heart Failure Has Its Own Range
If you have heart failure specifically, the recommendations vary depending on the severity of your symptoms. The Heart Failure Society of America recommends 2,000 to 3,000 mg per day for most heart failure patients, with a stricter limit of under 2,000 mg for people with moderate to severe symptoms. The ACC/AHA guidelines also suggest moderate restriction at or below 2,000 mg for patients dealing with fluid overload.
Here’s where it gets nuanced. Research has found that for people with more advanced heart failure (significant shortness of breath, swelling, and limited physical activity), staying under 3,000 mg was associated with better outcomes. But for people with milder heart failure, that same level of restriction was actually linked to more hospital visits, readmissions, and higher mortality. The reasons aren’t fully settled, but the takeaway is clear: the right sodium target depends on where you are in the disease, not a single number that fits everyone.
Why Too Little Sodium Can Also Be a Problem
Aggressive sodium restriction, particularly below 2,000 mg per day, carries its own risks for heart failure patients. When sodium drops too low while someone is also taking diuretics (water pills), the body can activate stress hormones that increase cardiac workload and raise blood pressure. This counterproductive response is one reason why “lower is always better” doesn’t hold true for everyone.
Very strict restriction has also been linked to dangerously low blood sodium levels (hyponatremia), which can lead to longer hospital stays and higher readmission rates. In older heart failure patients, cutting sodium too far can reduce appetite and calorie intake, leading to malnutrition, muscle wasting, and frailty. These effects are made worse by the taste changes that often come with aging and multiple medications.
The overall picture favors a cautious, individualized approach. Moderate reduction helps most heart patients. Extreme restriction can backfire, especially in older adults or those with milder heart failure.
How Sodium Affects Your Heart
When you eat more sodium than your body needs, your kidneys hold onto extra water to keep sodium concentrations balanced. That extra fluid increases blood volume, which forces your heart to pump harder and raises pressure on artery walls. For a healthy heart, this is a temporary inconvenience. For a heart that’s already weakened or arteries that are already stiff, it’s a chronic burden that accelerates damage.
Your body also stores sodium in the skin, where immune cells detect the buildup and trigger responses that affect blood vessel function. In some people, this system doesn’t clear sodium efficiently, making them especially sensitive to salt. This helps explain why two people can eat the same amount of sodium and have very different blood pressure responses.
Where the Sodium Is Hiding
Most of the sodium you eat doesn’t come from the salt shaker. It comes from canned and processed foods: soups, frozen dinners, baked goods, condiments like ketchup and soy sauce, and restaurant meals. Tomato juice, which many people consider a healthy choice, is another common culprit. Even foods that don’t taste salty, like bread and cereal, can contribute significant sodium across a full day of eating.
Learning to read nutrition labels is the single most practical skill for managing your intake. The FDA defines specific terms you’ll see on packaging:
- Very low sodium: 35 mg or less per serving
- Low sodium: 140 mg or less per serving
- Reduced sodium: at least 25% less than the regular version (this doesn’t mean it’s low)
“Reduced sodium” is the most misleading label. A soup that normally contains 800 mg per serving could be labeled “reduced sodium” at 600 mg, which would still eat up a large chunk of a 1,500 mg daily budget in a single bowl. Always check the actual milligrams on the nutrition facts panel rather than trusting the front-of-package claims.
A Note on Salt Substitutes
Potassium-based salt substitutes are a popular way to add flavor without sodium, and for many people they’re a reasonable option. But they pose a real danger for heart patients who take certain common medications. ACE inhibitors, angiotensin receptor blockers, and potassium-sparing diuretics all raise potassium levels in the blood. Adding a potassium-heavy salt substitute on top of those medications can push potassium to dangerously high levels, which can cause heart rhythm problems. This risk is especially serious if you also have kidney disease, since your kidneys may not be able to clear the extra potassium efficiently. Check with your prescriber before switching to a potassium-based substitute.