Photo: Marie Martin

What happens if I stop eating salt?

In severe cases, low sodium levels in the body can lead to muscle cramps, nausea, vomiting and dizziness. Eventually, lack of salt can lead to shock, coma and death. Severe salt loss is very unlikely to happen because our diets contain more than enough salt.

betterhealth.vic.gov.au - Salt - Better Health Channel

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About salt

Salt is a chemical compound (electrolyte) made up of sodium and chloride. It is commonly used to preserve and flavour foods and is the main source of sodium in our diet. A small amount of sodium is important for good health as it helps to maintain the correct volume of circulating blood and tissue fluids in the body. However, most people consume much more sodium than they need. The kidneys are the main regulators of sodium levels in the body. Too much sodium can cause high blood pressure and many other health conditions. On the other hand, if sodium levels drop too low, the hormone aldosterone is released, and this increases the amount of sodium held in the body by reducing the amount lost in urine. Excessive sodium loss is very rare, but low sodium levels in the body can be dangerous if not treated.

Australians eat too much salt

The average Australian consumes almost double the amount of sodium they need for good health. The National Health and Medical Research Council (NHMRC) advises that Australian adults should aim to consume no more than one teaspoon (5 grams) of salt a day (or 2,000mg of sodium a day) in order to prevent chronic disease. Aiming for less than this is perfectly okay too. An adult body only needs around 1 to 2g of salt (460 to 920mg sodium) per day to function. Sodium intake above 2,000mg per day is associated with high blood pressure, which is a risk factor for kidney disease and cardiovascular disease (such as heart disease and stroke).

Recommended salt intake for Australian children

Australian children are eating too much salt too. In fact, almost 3 quarters of Victorian school children are eating more than the recommended amount. This can lead to lifelong unhealthy eating habits and have a negative effect on children’s blood pressure. This can lead to heart attacks and strokes in the future.

Generally, infants and children need less salt than adults.

The recommended daily sodium intake for children varies depending on their age, as follows:

1 to 3 years (200 to 400mg/day)

4 to 8 years (300 to 600mg/day)

9 to 13 years (400 to 800mg/day)

14 to 18 years (460 to 920mg/day)

To reduce salt intake it is best to stick to a healthy diet – many healthy, everyday foods contain minimal sodium (such as vegetables and fruit, most dairy and fresh meats).

High sodium intake and blood pressure

The relationship between sodium intake and blood pressure is well established. Populations with a high average salt intake have higher levels of hypertension (high blood pressure). Australians consume nearly double the amount of sodium that is recommended to reduce the risk of cardiovascular disease. Reducing the amount of salt you have will lower high blood pressure – the extent depends on your age, current blood pressure and other factors such as the amount of exercise you do, body weight, stress and alcohol intake. People with high blood pressure, diabetes or chronic kidney disease and those who are older or overweight are particularly susceptible to the effect of too much sodium on blood pressure. There is strong evidence that sodium reduction lowers blood pressure in people with normal blood pressure and good evidence that consuming a diet low in sodium reduces blood pressure in children.

High sodium intake and other health conditions

Excessive sodium intake has also been linked to other conditions, such as:

A high level of salt intake increases the amount of calcium excreted in the urine, which may also contribute to osteoporosis and increased risk of fracture. The balance of sodium and water in the body can also be disrupted if there is not enough water. This may be caused by a damaged thirst mechanism or by limited access to water. Hypernatremia is a very serious condition that occurs when your sodium blood levels rise above 145 milliequivalents per litre (mEq/L). It can lead to death. A major symptom is thirst and treatment usually involves controlled water replacement.

Salt loss (hyponatremia)

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The body loses salt through urine, perspiration, vomiting and diarrhoea. If too much salt is lost, the level of fluid in the blood will drop. Hyponatremia is a condition that occurs when the sodium in your blood falls below the normal range of 135–145 mEq/L. In severe cases, low sodium levels in the body can lead to muscle cramps, nausea, vomiting and dizziness. Eventually, lack of salt can lead to shock, coma and death. Severe salt loss is very unlikely to happen because our diets contain more than enough salt. The only time this is likely to occur is when someone has acute gastroenteritis (causing vomiting and diarrhoea), severe sweating or water intoxication (from drinking too much water).

Muscle cramps need water not salt

Some people believe that salt needs be replaced during hot weather or strenuous exercise to avoid muscle cramps. This is not correct. What you need to replace is water. The human body can happily survive on just one gram of salt a day, as hormones keep a check on sodium levels and make adjustments for hot weather. A genuine sodium shortage brought on by hot weather or exercise is extremely rare, even among hard-working athletes. The muscle cramps that sometimes follow a bout of sweating are due to dehydration, not lack of salt. To prevent cramps, drink plenty of water on hot days and before, during and after exercise. This will also help to even out the water–sodium ratio in the body.

Sodium and potassium in the body

Potassium is important for the nerves, muscles and heart to work properly. It also helps to lower blood pressure. However, some people with kidney disease, or who are taking some medications, need to be careful not to get too much potassium in their diet. Our bodies are designed for a high-potassium diet, not a high-salt diet. Food processing tends to lower the potassium levels in many foods while increasing the sodium content. It is much better to eat unprocessed foods such as fruit, vegetables and lean meats, eggs, fish and other healthy, everyday foods. When selecting processed everyday foods such as wholegrain breads and cereals, select lower salt options. To do this, check the food label for the amount of sodium contained in the product per 100 grams and pick the product with less sodium.

Foods high in potassium include bananas, apricots, mushrooms and spinach.

Sodium in food

Many foods – wholegrains, meat and dairy products – naturally contain small amounts of sodium, while highly processed foods tend to contain large amounts of added salt.

Some foods contain more than you may expect. For example:

A jam sandwich has only 30% less salt than a vegemite sandwich, because most of the salt comes from the bread.

Sea salt, onion, celery or garlic salts are not low-sodium substitutes.

A bowl of cornflakes has about the same amount of salt as a small packet of plain chips.

Some sweet biscuits contain as much or more salt than savoury biscuits.

Ricotta, cottage, mozzarella and Swiss cheeses are lower in salt than most other cheeses.

How to reduce salt in your diet

Your taste buds adapt to lower salt levels in food in a matter of weeks, so gradually reducing salt in your diet is a key factor to success. To reduce the amount of salt in your diet, slowly reduce your intake (over several weeks). Then eventually try to completely avoid adding salt at the table, and when cooking or preparing meals.

Reduce salt when eating, cooking or preparing meals

Consider:

Using dry or fresh herbs like parsley, oregano, thyme, dill, basil or a dry herb mix to add flavour.

Using spices and other flavour enhancers like garlic and chilli.

Lemon or lime juices are excellent flavour enhancers and often make meats more tender. Experiment with small amounts and use a recipe book to get ideas on what flavours go well together. (For example, curry powder enhances the flavour of potatoes or eggs, and vegetables go nicely with balsamic vinegar and olive oil).

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If you currently use quite a lot of salt in cooking or at the table, reducing this is even more important. For the average person, this accounts for around 25% of their total salt intake and is one easy action you can take to reduce your sodium intake. Some people believe sea salt is a healthier alternative to normal table salt, but both are composed of sodium chloride so are best avoided.

Avoid fast foods and takeaway foods that are high in salt.

Ask for less salt when dining out – you may even like to provide feedback to businesses if their dishes appear salty.

Select foods with less hidden salt

While reducing the salt you add at the table and when cooking or preparing meals, you should also focus on selecting foods that contain less ‘hidden’ salt because this accounts for around 75% of all salt in most people’s diet.

When shopping:

Look for products labelled ‘salt reduced’ or ‘no added salt’ (for example on canned vegetables). Check the food label on the back of a product for the amount of sodium per 100g. To choose a ‘low salt’ product, pick one with less than 120mg of sodium per 100g. Choose reduced salt bread and breakfast cereals – bread is a major source of sodium in the diet.

Buy fresh vegetables or select lower sodium canned varieties.

Choose unprocessed fresh wholefoods, like fruits and vegetables.

Reduce packaged and processed snack purchases.

Avoid high-salt, processed foods

Around 75% of the salt in our diet comes from processed foods. You can’t see the added salt in these foods, which means often you are unaware of the amount of salt you are having. Many food companies are working to try and reduce the sodium content of processed foods.

High-salt foods that should be eaten sparingly include:

most ‘fast’ foods (such as pizza, hamburgers, chips)

most snack foods (such as potato chips, corn chips)

processed meats (such as sausages, salami, hot dogs and luncheon meats)

dehydrated or packet foods (such as instant pasta, noodles or soups)

pre-packaged sauces and condiments (such as pickles, chutneys, soy sauce and tomato-based paste and sauces).

Iodine

Our bodies need iodine to make sure our thyroid gland and the hormones that regulate our metabolism work normally. Most bread in Australia and New Zealand is now required by law to use iodised salt in place of non-iodised salt, although bread labelled as ‘organic’ is exempt. It is expected that this will make sure most Australian adults and children will consume enough iodine to meet their needs. It is very important that pregnant and breastfeeding women get enough iodine. The National Health and Medical Research Council recommends that all women who are pregnant, breastfeeding or considering pregnancy, take an iodine supplement . Low iodine status in the mother can affect the brain development of their child. Another good way to make sure you get enough iodine is to eat seafood at least once a week. However, some types of fish contain high levels of mercury, which is dangerous to a developing foetus. If you are pregnant, take care when choosing fish to eat to reduce your risk. People who are not getting enough iodine from their diet may need a vitamin supplement. Seek advice from your doctor or a dietitian.

Where to get help

betterhealth.vic.gov.au - Salt - Better Health Channel

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