Leena Watts
Salt, also known as sodium chloride, is commonly used to preserve and flavour foods. While a small amount of sodium is important for good health, most people consume much more than they need. Excessive salt intake can cause high blood pressure and increase the risk of heart disease, stomach cancer, and bone loss. It can also be dangerous for babies and young children as their kidneys are not fully developed and cannot process it. Therefore, it is important to reduce salt in our diet by opting for low-sodium foods, limiting condiments and processed foods, and flavouring meals with herbs and spices instead of salt.
Why do we need to reduce salt in our diet?
| Characteristics | Values |
|---|---|
| High blood pressure | Excessive salt intake can cause high blood pressure, which can lead to heart disease. |
| Kidney damage | High salt intake can lead to kidney damage. |
| Bone loss | A study found that high salt intake was linked to a loss of hip bone density in post-menopausal women. |
| Increased stomach cancer risk | Research suggests a link between high salt intake and an increased risk of stomach cancer. |
| Hidden in everyday foods | Salt is often hidden in everyday packaged and processed foods, such as bread, breakfast cereals, meat products, and ready meals. |
| Negative health effects | Excessive salt intake has been linked to various negative health effects, including nausea, vomiting, weakness, loss of appetite, intense thirst, confusion, and an increased risk of chronic diseases. |
| Heart disease | Reducing salt intake can lower the risk of developing heart disease, particularly heart failure and ischemic heart disease. |
| Flavor enhancement | Salt is commonly used to enhance the flavor of food, but there are healthier alternatives, such as herbs, spices, lemon, lime, and vinegar. |
| Preservative | Salt is used as a preservative in food, but there are healthier alternatives, such as fresh, unprocessed whole foods. |
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What You'll Learn
- High salt intake increases blood pressure, which can lead to heart disease
- Salt is hidden everywhere, and people are often unaware of foods that contain high amounts
- Salt is a preservative, and processed foods are often high in sodium
- Salt is linked to an increased risk of stomach cancer
- High-salt diets can cause kidney damage
High salt intake increases blood pressure, which can lead to heart disease
Excessive salt consumption is linked to an increased risk of high blood pressure, which is a significant risk factor for heart disease. While the exact mechanisms are still being unravelled, the association between salt intake and hypertension is well-established.
Salt, or sodium chloride, contains sodium, which is the component that directly impacts blood pressure. When we consume too much sodium, it triggers remodelling in small resistant arteries, leading to an increase in vascular stiffness. This reduction in arterial flexibility results in higher blood pressure and a subsequent elevation in blood pressure.
Additionally, high salt intake can cause a marked reduction in endothelial nitric oxide (NO), which is responsible for endothelium-dependent vascular dilatation. Lower levels of NO contribute to increased blood pressure and various cardiovascular complications independent of blood pressure.
The impact of salt on blood pressure varies among individuals due to genetic differences. It is estimated that about one-third of healthy individuals are salt-sensitive, experiencing a rise in blood pressure when they increase their salt intake. On the other hand, about one in ten people have inverse salt sensitivity, where their blood pressure increases when they consume less salt.
To maintain a healthy blood pressure and reduce the risk of heart disease, it is generally recommended to reduce salt intake to moderate levels. This typically means limiting sodium intake to 2.3-4.6 grams per day, which translates to about 5.75-11.5 grams of sodium chloride. However, it's important to note that the specific recommendations may vary depending on individual factors, and it's always advisable to consult with a healthcare professional for personalised guidance.
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Salt is hidden everywhere, and people are often unaware of foods that contain high amounts
Salt is added to many packaged and everyday foods, such as bread, breakfast cereals, meat products, and ready meals. It is also present in meals from restaurants, cafes, and takeaways. As a result, it can be challenging to avoid consuming excessive amounts of salt. According to the Centers for Disease Control and Prevention, more than 40% of the sodium we eat daily comes from just ten main food sources.
Many people assume that most of their salt intake comes from the salt they add while cooking or at the table. However, this often isn't the case. Dolores Woods, a registered dietitian, notes that "a lot of times, [salt intake] comes from a lot of those packaged foods that we eat." The accumulation of sodium from these small bites throughout the day can quickly exceed the recommended daily intake.
Some examples of foods with hidden salt include canned vegetables, frozen meals, vegetable juice, deli meats and cheeses, sauces such as soy sauce and ketchup, and snacks like pretzels and salted chips. Even some dissolvable tablets for painkillers, vitamins, or prescription medications may contain high levels of salt.
To reduce salt intake, it is important to read food labels and choose low-sodium or salt-free options. Preparing meals from scratch using fresh ingredients and flavouring them with herbs, spices, and citrus can also help reduce salt intake while enhancing flavour.
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Salt is a preservative, and processed foods are often high in sodium
Salt is a preservative and has been used for centuries to preserve food. It is also used to flavour food and as a binder and stabiliser. Salt, also known as sodium chloride, is about 40% sodium and 60% chloride. While a small amount of sodium is important for good health, most people consume much more than they need. Excess sodium intake can cause high blood pressure and lead to heart disease.
Salt is hidden everywhere in our food, and it can be hard to avoid. Around three-quarters of the salt we eat comes from packaged and processed foods, such as bread, breakfast cereals, meat products, and ready meals. It is also found in fast food, takeaways, and meals from restaurants or cafes. The high salt content in these foods is often due to the use of salt as a preservative.
Processed meats, such as bacon, ham, salami, sausages, and hot dogs, are particularly high in sodium. They also contain sodium nitrate as a preservative, which further boosts the sodium count. Canned soups, pizza, and Mexican dishes like tacos can also be high in sodium due to the combination of salty ingredients used.
To reduce salt intake, it is recommended to choose fresh, unprocessed foods over processed ones. Opt for low-sodium or sodium-free options when possible, and check nutrition labels to identify sodium levels. Be mindful that some condiments and sauces, such as soy sauce, ketchup, and salad dressings, can also be high in salt.
By making smart swaps, such as choosing whole grains over refined carbohydrates and cooking your own fresh meat instead of buying processed meat, you can significantly reduce your salt intake and improve your heart health.
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Salt is linked to an increased risk of stomach cancer
Ecological, case-control, and cohort studies have indicated a positive association between salt intake and stomach cancer mortality. The World Health Organization (WHO)/Food and Agriculture Organization (FAO) Expert Consultation in 2003 concluded that salt-preserved foods and salt likely increase stomach cancer risk. Research has shown that salt damages the stomach lining and causes lesions, which can develop into stomach cancer.
Infection with Helicobacter pylori (H. pylori) bacteria also damages the stomach lining and is worsened by salt intake. H. pylori infection is relatively common in parts of Asia and is an independent cause of stomach cancer. Salt may also cause stomach cancer by directly damaging gastric mucus, improving temporary epithelial proliferation, inducing endogenous mutations, and causing hypergastrinemia, which leads to parietal cell loss and gastric cancer.
Additionally, certain high-salt foods, such as meat, fish, and salt-preserved vegetables, have been found to increase the risk of stomach cancer. These foods are commonly preserved by salting and fermentation in countries like Japan and Korea, which may contribute to the geographic variations in stomach cancer rates.
To reduce the risk of stomach cancer, it is recommended to limit salt intake to below 5g per day for adults. This can be achieved by reducing the consumption of salted and processed foods, reading food labels, and using herbs and spices instead of salt for flavoring.
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High-salt diets can cause kidney damage
Excess salt in the body can alter the sodium-potassium balance, which is essential for the kidneys to function properly. When this balance is disrupted, kidney function decreases, and the organs become strained, increasing the risk of kidney disease.
The kidneys are responsible for removing waste products and excess water from the blood to produce urine. When kidney function is reduced due to high salt intake, waste can build up in the bloodstream, leading to potential health complications.
A high-salt diet has also been linked to kidney stones, which are relatively common and affect 6% of women and 11% of men at some point in their lives. Kidney stones are painful and can cause nausea and difficulty passing urine. They occur when excess salt increases the amount of calcium lost in urine, leading to the formation of stones.
In addition to increasing the risk of kidney stones and kidney disease, high salt intake can also contribute to the deterioration of already declining kidney function in individuals with chronic kidney disease (CKD). It is therefore crucial for people with CKD to carefully monitor their salt intake to prevent further damage to their kidneys.
To maintain kidney health, it is important to limit salt intake. This can be achieved by choosing low-sodium or sodium-free foods, reading food labels, and using fresh herbs and spices instead of salt when cooking. By making conscious choices to reduce salt intake, individuals can lower their risk of kidney-related issues and improve their overall health.
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Frequently asked questions
Excess salt intake can cause high blood pressure and lead to heart disease.
The recommended daily salt intake for adults is no more than 6g, which is about 1 level teaspoon. However, the average adult consumes about 3,400 milligrams (mg) of sodium per day, which is much higher than the recommended amount.
Processed and packaged foods such as bread, breakfast cereals, meat products, and ready meals are high in sodium. Other high-sodium foods include cured meats, cheese, olives, and condiments like soy sauce, ketchup, and mayonnaise.
To reduce salt intake, opt for low-sodium or sodium-free versions of foods. Choose fresh, unprocessed whole foods like fruits and vegetables, which are naturally low in sodium. Read food labels to understand the sodium content and make smart swaps, such as choosing whole grains instead of bread.
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