Madeleine Hull
Salt, also known as sodium chloride, is a common ingredient in many diets. While it is essential for nerve impulses, muscle function, and maintaining water and mineral balance, excessive salt intake can lead to adverse health effects. The average global salt consumption far exceeds the recommended daily intake, with most salt coming from packaged, processed, and commercially prepared foods. High salt intake has been linked to an increased risk of high blood pressure, heart disease, stroke, stomach cancer, and other health issues. Reducing salt intake is a cost-effective way to improve health and prevent non-communicable diseases. Therefore, it is important to limit salt in your diet to maintain overall health and well-being.
| Characteristics | Values |
|---|---|
| Recommended daily intake of salt | 6g or 1 level teaspoon for adults (according to the NHS) |
| Less than 5g or just under a teaspoon for adults (according to the WHO) | |
| Less than 2,300 mg for children under 14 (according to the FDA) | |
| Average daily intake of salt | 3,400 mg of sodium or 1.5 teaspoons of salt (in the US) |
| 4,310 mg of sodium or 10.78 g of salt (global mean intake) | |
| Health effects of high salt intake | Raised blood pressure |
| Increased risk of cardiovascular diseases, gastric cancer, obesity, osteoporosis, Meniere's disease, kidney disease, and stroke | |
| Calcium loss, which may be pulled from bones | |
| Progression of CKD | |
| Ways to reduce salt intake | Limit the amount of salt added when cooking and eating |
| Use salt substitutes like herbs, spices, lemon, garlic, ginger, vinegar, and pepper | |
| Remove salt shakers from the table | |
| Read ingredient labels to identify foods high in sodium | |
| Choose fresh, frozen, or low-sodium canned vegetables | |
| Choose low-sodium nuts, seeds, and snacks | |
| Avoid sauces high in salt, such as soy sauce, gravy, ketchup, mustard, mayonnaise, and brown sauce |
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What You'll Learn
High blood pressure and heart disease risk
While the human body requires a small amount of sodium to function properly, excessive sodium intake can lead to serious health issues, particularly high blood pressure and an increased risk of heart disease.
High blood pressure, or hypertension, is a condition in which the force of blood against the walls of your arteries is consistently too high. It is a major cause of concern as it often exhibits no warning signs or symptoms. Over time, if left untreated, it can lead to an increased risk of heart disease and other health complications.
Research has established a direct link between high salt intake and elevated blood pressure. The sodium component of salt is the primary culprit, as it disrupts the balance of body fluids and affects the contraction and relaxation of muscles. As a result, the heart has to work harder to pump blood throughout the body, leading to increased blood pressure. This additional strain on the heart's functioning can contribute to the development of heart disease over time.
The recommended daily sodium intake for adults is generally agreed to be around 2,000 mg to 2,300 mg, which is equivalent to about one teaspoon of salt. However, the average American consumes approximately 3,400 mg of sodium per day, with some estimates reaching 5 teaspoons of salt per day. This excessive intake of salt contributes to the high prevalence of high blood pressure and associated health risks, including heart disease.
To mitigate these risks, it is important to monitor and reduce salt intake. This can be achieved by limiting the use of table salt, opting for fresh or low-sodium food options, reading food labels to identify high-sodium content, and exploring alternative seasonings like herbs and spices to enhance the flavor of meals.
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Calcium loss and osteoporosis
Salt, or sodium chloride, is a common ingredient used in food preparation for flavouring, binding, preserving, and stabilising. While a small amount of sodium is required by the human body to function, excessive sodium intake can lead to adverse health effects, including high blood pressure, heart disease, and stroke.
One of the negative impacts of a high-sodium diet is calcium loss. The body loses calcium through urination, and the amount of calcium lost increases with salt intake. This loss of calcium can lead to osteoporosis, a bone-thinning disease. When calcium is in short supply in the blood, it can be leached from the bones, leading to reduced bone density and an increased risk of fractures. This is particularly important for postmenopausal women, who are at a higher risk of osteoporosis due to decreased estrogen levels, which normally help protect bone density.
Research has shown a correlation between salt intake and calcium excretion, particularly in young and adolescent girls. This can result in a reduced peak bone mass, increasing the risk of osteoporosis later in life. A diet high in calcium, including dairy products like milk, can help maintain bone mass and reduce the risk of osteoporosis.
However, some studies have found conflicting results regarding the impact of salt intake on bone health. One study on postmenopausal women showed no significant association between sodium intake and bone mineral density or fracture rates. Another study suggested that a low-salt diet could also negatively affect bone health by stripping the bones of sodium, calcium, and magnesium, potentially leading to osteoporosis.
While the exact relationship between salt intake and osteoporosis is still being studied, it is generally recommended to limit salt intake to maintain overall health. The recommended daily salt intake is no more than 6 grams, and this can be achieved by reducing the consumption of processed and canned foods, checking product labels, and opting for low-salt dairy products.
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Stomach cancer risk
While the human body requires a small amount of sodium to function properly, excessive sodium intake can lead to serious health issues. Research has shown that a high intake of salt, sodium, or salty foods is linked to an increased risk of stomach cancer. The World Cancer Research Fund and American Institute for Cancer Research concluded that salt and salty foods are a "probable cause of stomach cancer".
The human body requires approximately 500 mg of sodium per day to conduct nerve impulses, contract and relax muscles, and maintain the proper balance of water and minerals. However, the average American consumes about 3,400 mg of sodium per day, which is far more than what the body needs. This excessive intake of sodium is often attributed to the high levels of sodium found in commercially prepared and packaged foods, such as bread, processed meats, and snacks.
To reduce the risk of stomach cancer associated with high salt intake, it is important to limit the amount of sodium in your diet. The World Health Organization recommends that adults consume less than 2,000 mg of sodium per day, which is equivalent to less than 5 g of salt. This is significantly lower than the global mean intake of adults, which is 4,310 mg/day of sodium. By reducing sodium intake, individuals can not only lower their risk of stomach cancer but also improve their overall health and reduce the likelihood of developing other non-communicable diseases.
There are several ways to reduce sodium intake. Firstly, individuals can limit the amount of table salt added to foods during cooking or at the table. Instead of using salt as a primary seasoning, try experimenting with herbs, spices, lemon, garlic, or other flavour enhancers. Additionally, choosing fresh, unprocessed foods over packaged and prepared options can help reduce sodium intake. Fresh meat, poultry, seafood, and vegetables are naturally lower in sodium compared to their processed counterparts. Checking nutrition labels and choosing low-sodium or no-salt-added options can also help individuals make healthier choices and reduce their risk of stomach cancer associated with high salt intake.
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Salt in packaged and prepared foods
It is recommended that adults limit their sodium intake to less than 2,300 mg per day, which is equal to about one teaspoon of salt. However, the average daily sodium intake in the United States is 3,400 mg, much higher than the recommended limit. This high intake of sodium mostly comes from packaged and restaurant foods, rather than from overusing a salt shaker.
Packaged meats, such as plain, frozen shrimp, often contain added salt for flavor and sodium-rich preservatives. Similarly, packaged broths and stocks, commonly used as bases for soups or to flavor other dishes, are notoriously high in salt. Breads, cereals, and pastries also contain sodium, and the sodium content can add up over the course of a day, even if an individual serving is not high in sodium.
Sandwiches are another example of a multi-ingredient dish that accounts for almost half of the sodium Americans consume. The bread, processed meat, cheese, and condiments used to make sandwiches all contribute significant amounts of sodium. A 6-inch submarine sandwich made with cold cuts averages 1,127 mg of sodium, or 49% of the RDI. In addition, sauces and condiments such as soy sauce, ketchup, gravy granules, mustard, mayonnaise, and barbecue sauce are often high in sodium.
When buying packaged foods, it is important to read the nutrition labels to identify those that are lower in sodium. Some foods that are high in sodium may not taste salty, so it is important to not rely on taste alone to judge a food's sodium content.
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Tips to reduce salt intake
It is important to limit salt in your diet because consuming too much sodium can lead to high blood pressure and an increased risk of heart disease, stroke, and stomach cancer. While the human body requires a small amount of sodium to function properly, most people consume far more than is needed. Here are some tips to reduce salt intake:
Read the Labels
When buying packaged foods, always read the nutrition labels and choose products with lower sodium content. Different brands of the same food can have varying sodium levels, so it's important to compare before purchasing. Look for terms like "low sodium," "reduced sodium," or "no salt added."
Choose Fresh and Unprocessed Foods
Most of the salt in our diets comes from commercially prepared, packaged, and restaurant foods. Opt for fresh, whole foods like fruits, vegetables, whole grains, and unprocessed meats, which are naturally low in sodium. When buying canned or frozen products, choose those without added salt or brine.
Cook from Scratch
Cooking meals from scratch allows you to control the amount of salt added to your food. Use basic ingredients like dry beans, rice, and pasta, and season them with herbs, spices, garlic, citrus juices, or salt-free seasonings instead of salt. You can also try combining lower-sodium versions of foods with regular versions to reduce salt intake gradually.
Limit High-Sodium Condiments and Sauces
Sauces and condiments like soy sauce, ketchup, mustard, mayonnaise, and gravy granules are often high in sodium. Limit your use of these or opt for low-sodium versions. Be mindful that even some dissolvable tablets for painkillers, vitamins, or prescription medicines may contain high amounts of salt.
Reduce Salt Gradually
Your taste buds can adjust to lower-sodium foods over time. Start by reducing the amount of salt you add during cooking and at the table gradually. As you reduce your salt intake, you may find that you begin to appreciate the natural flavours of food more.
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