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Sodium

Sodium is most commonly found in food as salt (sodium chloride). A small amount of sodium is required by the body as it plays an essential role in keeping the fluids and electrolytes in our bodies balanced.

This is important when we exercise and sodium is lost through sweating.  However too much salt in our diet is associated with an increased risk of raised blood pressure, which is a risk factor for heart disease, stroke and kidney disease. Higher sodium intakes have been shown to increase calcium losses in the urine, potentially increasing the risk of osteoporosis.

Click to read an article by Dr Helen Eyles - Sodium intake and health In New Zealand

How much sodium do we need?

Age (years)

RDI* Sodium (mg/day)

Men

19-70+

920-2300

Women

19-70+

920-2300

2300mg is equivalent to 1 teaspoon of salt. To convert between sodium and salt quantities multiply the sodium amount by 2.5. 

Who needs less and why?

In particular, people with high blood pressure need to watch how much sodium they eat. How blood pressure is affected by increases and reductions in sodium intake varies, depending on genetics, age, medications, ethnicity and medical conditions (such as Type 2 diabetes). Any decrease in sodium intake should be discussed with, and monitored by, your doctor.
However all New Zealanders should be encouraged to reduce their sodium intake as it has been determined that New Zealanders consume 3500mg of sodium per day (the equivalent of 1.5 teaspoons of salt) which is well over the recommended level of 2300mg. Being aware of the sodium content of the packaged and processed foods you are consuming is especially key to reducing your sodium intake as discussed below.

Which foods contain sodium?

Only 10% of salt consumed occurs naturally in food, with 15% of salt consumed added to food in cooking or at the table. This means most sodium in our diets comes from processed and manufactured food. This explains why it is recommended that we choose fresh food rather than processed foods.

When choosing packaged foods refer to the Nutrition Information Panel on the packaging. Sodium is listed in milligrams (mg) and by refering to the following classifcation system you can idenify whether the food is a low. medium or high salt food.

Low salt foods are those which contain less than 120mg of sodium per 100g of food

Medium salt foods contain between 120 and 600mg of sodium per 100g of food

High salt foods contain more than 600mg of sodium per 100g of food 

Sodium content of food

Sodium (mg)

Classification

Fruit salad

1.2

Low

Sweetened Low Fat Yoghurt

47

Low

Instant Noodles

239

Medium

Multigrain bread

380

Medium

Fried Rice

411

Medium

Dried creme of chicken soup, made with water

287

Medium

Canned cream of chicken soup

460

Medium

Pizza, mixed toppings

640

High

Deep fried pork sausage

860

High

Salami

1850

High

Yeast extract spread

3300

HIgh

Tomato sauce

615

High

Potato chips

670

High

Tips for reducing sodium intake

  • Choose low-salt foods everyday: fruit and vegetables, lean meats, poultry, fish, seafood, plain wholegrain products, unprocessed breakfast cereals, and low-fat milk and dairy products.

  • Prepare meals without adding salt. Leave the salt shaker off the table, and use herbs and spices to add flavour instead.

  • All salt whether it is table salt, sea salt or rock salt contain sodium.

If you are concerned about your salt or sodium intake, talk to your doctor.

The National Heart Foundation’s website, has information on salt and heart disease.

You can also visit the Saltwise Challenge compiled by Stroke Foundation of New Zealand to check your knowledge of Sodium.

Last modified: 
08/05/18