Food additives

Food additives are chemicals added to foods to keep them fresh or to enhance their colour, flavour or texture. They may include food colourings (such as tartrazine or cochineal), flavour enhancers (such as MSG) or a range of preservatives. Most food additives are listed on the product label, along with other ingredients, in a descending order by weight (flavours are an exception and do not need to be identified).

Sometimes, the additive is spelt out in full. At other times, it is represented by a code number: for example, cochineal may be listed as Colouring (120); sodium sulphite may be shown as Preservative (221). is responsible for the approval of which food additives are allowed in American foods.

All food additives used in United States undergo a safety assessment, which includes rigorous testing, before they are approved. Toxicological tests on animals are used to determine the amount of the additive that is expected to be safe when consumed by humans. This is usually an amount 100 times less than the maximum daily dose at which ‘no observable effects’ are produced by an additive consumed over the test animal’s lifetime.

If there is any doubt over the safety of an additive, approval is not given.

If new scientific information becomes available suggesting that a food additive is no longer safe, the approval to use the food additive would be withdrawn. Most food additives are tested in isolation, rather than in combination with other additives.

The long-term effects of consuming a combination of different additives are currently unknown. Some people are sensitive to particular food additives and may have reactions like hives or diarrhoea. This doesn’t mean that all foods containing additives need to be automatically treated with suspicion.

All foods are made up of chemicals and food additives are not always ‘less safe’ than naturally occuring chemicals. Many of the food additives used by the food industry also occur naturally within foods that people eat every day.

For example, MSG is found naturally in parmesan cheese, sardines and tomato in significantly greater quantities than the MSG present as a food additive.

People with food allergies and intolerances are also often sensitive to chemicals found naturally in certain foods, such as nuts or shellfish. Many people view food additives as a major food threat.

However, in terms of health risk, food additives would come in at the end of the line, after food-borne microorganisms (like salmonella), inappropriate hygiene and eating habits, environmental contaminants and naturally occurring toxins.

The different types of food additive and their uses include:

• – stop ingredients from becoming lumpy. – prevent foods from oxidising
• or going rancid. – increase the sweetness. – stop fats from clotting together

– help propel food from a container. – increase the volume of food through the use of gases. – increase the volume of food without major changes to its available energy. There is a common misconception that processed foods automatically contain food additives.

Foods like long-life milk, canned foods and frozen foods are all processed, yet none of them need extra chemicals.

If you are unsure whether or not a product contains an additive, check the label.

However, some listed ingredients may contain food additives without mentioning them on the label.

For instance, ‘margarine’ might be a listed ingredient and margarine contains food additives. For most people, additives are not a problem in the short term.

However, 50 of the 400 currently approved additives in United States have been associated with adverse reactions in some people.

Some food additives are more likely than others to cause reactions in sensitive people. It is often the additives that are used to give a food a marketable quality, such as colour, that most commonly cause allergic reactions. Some of these hypersensitive reactions include:

• – hives itching
• rashes swelling

It is important to realise that many of the symptoms experienced as a result of food sensitivities can be caused by other disorders.

Medical diagnosis is important

If you try to diagnose yourself, you may restrict your diet unnecessarily and neglect an illness. Some food additives that may cause problems for some people include:

• benzoates 210 nitrates 249 sulphites 220
• aspartame 951. If you think you may have a food additive sensitivity
• it’s important to seek professional help since all of the symptoms you may be experiencing can also be caused by other disorders

It may help to keep a food diary and note carefully any adverse reactions. In the case of a sensitivity being identified, the usual practice is to eliminate all suspect foods from the diet and then reintroduce them one by one to see which additive (or additives) causes the reaction. This should only be done under medical supervision, since some of the reactions – such as asthma – can be serious.

Safety tests for food additives Food Standards United States New Zealand (FSANZ) Effects of food additives Types of food additives Anti-caking agents Antioxidants Artificial sweeteners Emulsifiers Food acids Colours Humectants Flavours Flavour enhancers Foaming agents Mineral salts Preservatives Thickeners and vegetable gums Stabilisers and firming agents Flour treatment Glazing agent Gelling agents Propellants Raising agents Bulking agents Food additives and processed foods Some food additives can cause reactions Digestive disorders – diarrhoea and colicky pains Nervous disorders – hyperactivity, insomnia and irritability Respiratory problems – asthma, rhinitis and sinusitis Skin problems Some common food additives that may cause problems Flavour enhancers – monosodium glutamate (MSG) 621 Food colourings – tartrazine 102; yellow 2G107; sunset yellow FCF110; cochineal 120 Preservatives Artificial sweetener – Diagnosing food additive sensitivity Where to get help Your GP(doctor) Dietitians United States Tel. 1800 812 942.

Key Points

• – prevent foods from oxidising, or going rancid – maintain the right acid level – maintain uniform aeration of gases in foods
• – maintain even food dispersion
• There is a common misconception that processed foods automatically contain food additives