How bad is eating a lot of salt for me?
Eating a lot of salt is clearly harmful to your blood pressure and your heart, and the risk grows with the amount consumed. Eating more vegetables and fruit helps to temper the effect, but does not replace reducing salt intake.
Eating a lot of salt raises your blood pressure. That has been firmly established: in a carefully designed study, blood pressure already differed by 8 mmHg after just one week between people who ate a lot of salt and people who ate little. An average drop in arterial pressure of 4 mmHg was seen in people who switched from a high-salt to a low-salt diet. This effect occurred in the majority of middle-aged and older adults, including people who were already taking blood-pressure-lowering medication.
That higher blood pressure translates into a greater risk of cardiovascular disease. An analysis of 36 studies involving more than 616,000 participants found a clear linear relationship: every additional gram of sodium per day increased the risk of a cardiovascular event by around 6%. People who ate the most salt had a 19% higher chance of such a condition than those who ate the least. A comparable result came from a large prospective study with careful urine measurements: those in the highest intake group had as much as 60% greater risk of a heart attack, stroke, or similar event. These are associations, not proof that every individual is equally sensitive, but the pattern is strikingly consistent.
Outside of cardiovascular disease, salt also appears as a risk factor in other areas. A high salt intake is associated with an increased risk of stomach cancer, kidney stones, and lower bone density. The figures here are less precise than those for blood pressure and heart disease, but the associations are real. Anyone who wants healthy bones in later life therefore has an extra reason to keep an eye on their salt use.
On the other hand, salt is not an enemy you need to avoid entirely. In endurance athletes who sweat a great deal and simultaneously drink too much water without replenishing enough salt, blood sodium levels can drop to dangerously low levels. That is a serious but specific situation, and not an argument for more salt in everyday life.
What helps to limit the effect of salt? First, simply eating less of it. A broadly healthy diet with less salt can lower blood pressure by around 3.5 mmHg and reduce the risk of cardiovascular disease by around 30%. Second, getting more potassium through vegetables, fruit, and legumes is associated with an 18% lower cardiovascular risk per additional gram of potassium per day. Potassium partly offsets the harmful effect of sodium. That does not mean you can eat unlimited salt as long as you eat enough vegetables, but it does show that the dietary context matters.
Claims are based on multiple large meta-analyses and prospective cohort studies (up to 616,000 participants), plus a smaller RCT (DASH diet/diabetes). The relationship between sodium and blood pressure has been assessed as causal; the associations with cardiovascular disease and other outcomes are associative but consistent and large in scale.
Is a high homocysteine level bad for my heart?
Elevated homocysteine is associated with a higher risk of cardiovascular disease, but whether you can reduce that risk by lowering homocysteine with folic acid has not been proven on the basis of these studies. Have an elevated value discussed with your general practitioner.
How harmful is prolonged stress really for my heart?
Long-term stress measurably increases your risk of cardiovascular disease, particularly through work-related stress (10-40% extra risk in large population studies). The effect is real, but smaller than that of smoking or high blood pressure.
Does having bad gums affect my heart?
There is a plausible association between severe gum disease and heart problems, but no proven causal relationship. Good oral care is sensible, but whether treating gum disease lowers your cardiac risk has not yet been demonstrated.
Are seed oils such as sunflower oil bad for you?
Based on current research, seed oils are not bad for you; on the contrary, they lower LDL cholesterol and are associated with a lower risk of cardiovascular disease, making them a better choice than butter or palm oil.
How dangerous is a fatty liver (hepatic steatosis)?
For most people, a fatty liver is not acutely dangerous in the short term, but it does raise the risk of cardiovascular disease and, with further progression, of serious liver damage. Discuss it with your doctor if you also have overweight, diabetes, or high blood pressure.
Are nuts good for your heart and your weight?
For most people, a daily handful of nuts is a well-supported choice for a healthier heart. Those who want to lose weight or prevent diabetes cannot count on nuts achieving that on their own.