Salt isn’t inherently bad for you. Your body needs it to function. But most people eat far more than their body requires, and that excess raises the risk of heart disease and stroke over time. The real answer depends on how much you’re consuming, where it’s coming from, and how your individual body responds to it.
Why Your Body Needs Sodium
Sodium, the key mineral in salt, works like a chemical battery alongside potassium to power your nervous system. When one nerve cell needs to communicate with another, it opens tiny channels that let sodium rush in. That flood of sodium triggers the cell to fire, creating a chain reaction that carries signals to your brain or your muscles. Without enough sodium, this signaling breaks down. Your muscles contract using the same sodium-potassium exchange, meaning every heartbeat and every step depends on having adequate sodium in your system.
When sodium drops too low in the blood, a condition called hyponatremia, symptoms range from nausea and fatigue to confusion, seizures, and even coma. This is rare in healthy people eating a normal diet, but it can happen in older adults, people on certain medications, or endurance athletes who drink excessive water without replacing electrolytes.
How Too Much Salt Affects Your Body
When you eat more sodium than your body needs, it holds onto extra water to keep the concentration of sodium in your blood stable. That extra fluid expands your blood volume, which increases the pressure pushing against your artery walls. Your kidneys normally compensate by flushing out the excess sodium and water, but when intake stays consistently high, blood pressure stays elevated too.
This isn’t a small effect over a population. A large meta-analysis of 24 studies found that people with high sodium intake had a 19% greater risk of cardiovascular disease compared to those with low intake. The relationship was linear: every additional gram of sodium consumed per day increased cardiovascular risk by about 6%. To put that in perspective, the average person eats roughly 3.5 to 4 grams of sodium daily, well above the World Health Organization’s recommendation of less than 2 grams (about one teaspoon of table salt).
Not Everyone Responds the Same Way
One of the most important things to understand about salt is that people vary dramatically in how their blood pressure responds to it. Researchers call this “salt sensitivity,” and it’s far from universal. About 25% of people with normal blood pressure are salt-sensitive, meaning their blood pressure rises noticeably when they eat more sodium. Among people who already have high blood pressure, that figure jumps to around 50%.
This means that for a significant portion of the population, moderate salt intake may not pose much of a direct blood pressure risk. But since there’s no simple test you can take at home to determine your salt sensitivity, the general guidance to keep intake moderate still applies, especially if you have a family history of hypertension or heart disease.
Where the Salt Actually Comes From
If you’re picturing a salt shaker as the main culprit, think again. More than 70% of the sodium Americans consume comes from processed, packaged, and restaurant-prepared foods, not from salt added during cooking or at the table. Bread, deli meats, canned soups, frozen meals, pizza, cheese, and condiments are some of the biggest contributors. A single fast-food meal can easily contain an entire day’s worth of sodium.
This is why cutting back on salt at the dinner table, while helpful, only addresses a fraction of the problem. The more effective strategy is paying attention to nutrition labels on packaged foods and cooking more meals from whole ingredients, where you control how much salt goes in.
Potassium Matters as Much as Sodium
Focusing on sodium alone misses half the picture. Research consistently shows that the ratio of sodium to potassium in your diet is more strongly linked to blood pressure than either mineral on its own. Studies in people with high blood pressure found the best results when the sodium-to-potassium ratio approached 1:1, meaning roughly equal amounts of each. Achieving that balance was associated with a drop of about 6 points in systolic blood pressure (the top number) and 3 points in diastolic pressure.
Most people get far too much sodium and far too little potassium. Potassium-rich foods include bananas, potatoes, spinach, beans, yogurt, and avocados. Increasing these foods while reducing processed food intake shifts the ratio in a favorable direction, often more effectively than simply trying to eat less salt.
Practical Guidance for Most People
The WHO recommends staying under 2,000 mg of sodium per day, which equals about 5 grams of salt (just under a teaspoon). Most people in Western countries consume double that. You don’t need to obsessively track every milligram, but a few changes make a significant difference: cooking at home more often, choosing lower-sodium versions of canned and packaged foods, eating more fruits and vegetables (which are naturally low in sodium and high in potassium), and checking labels for anything over 600 mg per serving.
Salt isn’t poison, and going extremely low carries its own risks. Your body genuinely needs it. The problem is that modern diets deliver sodium in quantities your body was never designed to handle, hidden in foods you might not even think of as salty. The goal isn’t elimination. It’s getting closer to what your body actually needs and pairing it with enough potassium to keep the system in balance.