FOOD ALLERGY AND INTOLERANCE: APPENDIX I

Posted by admin on April 20, 2009 under Allergies | Be the First to Comment

Foods that may release sulphur dioxide

Sulphur (or sulfur) dioxide is a gas that can irritate the airways of asthmatics and provoke an asthma attack. Some preservatives give off this gas in small amounts, and it is inhaled during eating. There is no need to avoid these preservatives unless you are sure tfiey trigger off attacks.

Most dried fruits are treated with sulphur dioxide and give off the gas when chewed. This treatment does not have to be declared on the label. Dried fruit that has not been treated will usually be labelled ‘unsulphured’.

The following preservatives give off sulphur dioxide:

Sodium sulphite;

sodium hydrogen sulphite;

sodium metabisulphite;

potassium metabisulphite;

calcium sulphite.

These preservatives are widely used in wine, beer and cider, and, like other additives used in alcoholic drinks, do not have to be declared on the label. Homemade wine is no exception: Campden tablets, sold to wine-makers, contain potassium metabisulphite.

Fresh sausages may also contain these additives. Cod can be treated with sodium hydrogen sulphite to bleach and preserve it. Although sulphites are not allowed on meat, unscrupulous butchers occasionally add them to old meat to give it a ‘fresh’ red colour. In all these cases, the greater part of the sulphur dioxide will be driven off by the high temperatures used in cooking.

A fourth ‘hidden source’ of sulphur dioxide is restaurant, take-away and cafeteria food. French fries used in the catering trade have usually been dipped in a metabisulphite solution and give off significant amounts of sulphur dioxide. Prepared salads, avocado dip, shrimps, prawns and lobster are also likely to have been treated with these preservatives, and sometimes cause problems.

Fruit salad, glace cherries, fruit juices, fruit pie fillings, dried vegetables and soup, fruit squash, pickled onions, jam, fruit jellies and custard are other possible sources of sulphur dioxide in the catering trade. It is not worthwhile avoiding these foods unless you know they trigger off your asthma attacks.

Packaged foods often contain sulphites and metabisulphites, but these are easier to avoid as they are declared on the label. Look for the names given above, or for the appropriate ‘E numbers’. These are E220-E227.

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