Sodium is an essential element for body health, naturally found in many foods, and can also be added to other foods during preparation. No kitchen is without salt seasonings.
Although sodium is used almost daily in food, it's linked to high blood pressure, which can damage blood vessels and arteries if consistently high, increasing the risk of heart and kidney diseases.
So many health organizations have set guidelines to limit sodium intake, but not everyone benefits from sodium reduction. In this article, we'll cover sodium's importance, risks of too much or too little intake, and how much sodium you should eat daily.
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First: The importance of sodium for body health:
There are many claims that often misrepresent sodium consumption, but sodium is a necessary nutrient for good health. Sodium is one of the body's electrolytes, which are minerals that produce electrically charged ions.
Most sodium in the body is in the blood and fluids around cells. Sodium helps keep these fluids balanced. Besides fluid balance, sodium plays a key role in normal nerve and muscle function.
The kidneys help control sodium levels in the body by the amount of sodium excreted through urine. Sodium can also be lost through sweat.
A main source of sodium in most diets is table salt or sodium chloride, which is made up of 40% sodium and 60% chloride.
Salt is also found in large amounts in processed foods and their manufacturing, where these foods contain about 75% of consumed sodium.
Under normal conditions, sodium deficiency in diet is very rare, even when following very low sodium diets.
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Second :- The link between sodium and high blood pressure :-
Almost everyone knows sodium directly affects blood pressure. Sodium raises blood pressure especially in those who already have high blood pressure. Many studies have shown a strong link between too much sodium intake and high blood pressure.
One of the biggest studies on this is the Urban and Rural Epidemiology Study, which looked at sodium levels in urine from over 100,000 people in 18 countries across continents. Researchers found those who consumed more sodium had noticeably higher blood pressure than those who ate less.
Using the same group of people, other scientists found that those who consumed more than 7 grams of sodium daily were more likely to get heart disease and die early, compared to those who had 3-6 grams a day. But not everyone reacts to sodium effects the same way.
People with high blood pressure, diabetes, chronic kidney disease, and older adults tend to be more sensitive to sodium's effect on raising blood pressure.
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Third:- Daily sodium intake dietary recommendations:-
Health bodies usually recommend cutting down sodium intake to control high blood pressure. They estimate that the body only needs 186 mg of sodium daily to stay healthy.
But it's almost impossible to eat that little sodium and still meet daily energy needs and get enough other important nutrients. So the IOM recommends healthy adults consume 1500 mg of sodium daily, about 1.5 grams.
At the same time, the US Department of Agriculture, Health and Human Services, and the IOM advise healthy adults to keep daily sodium intake under 2300 mg, about 2.3 grams or a teaspoon of salt.
These numbers come from studies showing that eating more than 2.3 grams of sodium a day harms blood pressure and raises risk of heart disease.
Since a lot of sodium is lost through sweat, these amounts don't apply to very active people like athletes or workers in hot environments.
Some health bodies suggest other numbers. WHO says about 2000 mg or 2 grams daily. The American Heart Association says 1500 mg or 1.5 grams a day. But these guidelines are debated since people with normal blood pressure might not benefit from these sodium limits.
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Fourthly: Risks of low sodium intake:
Some evidence shows that cutting sodium down to recommended levels might be harmful. Some studies found that regardless of blood pressure issues, people consuming less than 3000 mg or 3 grams of sodium daily had higher risk of heart disease and death compared to those consuming 4000-5000 mg or 4-5 grams daily.
Also, people who ate less than 3 grams of sodium daily had worse health results than those who consumed 7 grams daily.
But these amounts don't apply to people with high blood pressure. Researchers found that people with high blood pressure who consume more than 7 grams of sodium daily have a higher risk of heart disease and death, compared to those who consume 4-5 grams daily.
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Fifthly: Limiting daily sodium intake:
In the end, many wonder if they should limit sodium. Yes, people with high blood pressure consuming 7 grams daily should reduce intake. This also applies if your doctor or certified nutritionist advises cutting sodium for medical reasons, like following a low sodium diet.
However, reducing sodium doesn’t seem to make a big difference for healthy people. Even though health organizations keep pushing for less sodium, cutting it too much, below 3 grams daily, can negatively affect health.
