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Soya-Free Diet

Illustration

Allergy to soya is one of the most common causes of food allergy in infants, young children, and adults. A soya-free diet removes soybeans and all products derived from soybeans. Most people who are allergic to soya are allergic to the protein in soya. Soya oil and soya lecithin pose little risk of causing an allergic reaction in most, although not all soya-allergic people because processing removes almost all the protein.

What are the symptoms?

Soya allergy symptoms may include any of the common symptoms of food allergies, including skin rashes or hives, gastrointestinal distress, breathing problems, or many other possible symptoms. In severe cases, a life-threatening reaction called anaphylaxis may occur, though such a severe reaction to soya is quite rare.

What do I need to avoid?

To avoid soya and soya products ask about ingredients at restaurants and others’ homes, read food labels, and become familiar with the technical or scientific terms for soya. The following list is not complete. Consult with a healthcare professional before making any significant changes to your diet.

  • Green soybeans (edamame)
  • Hydrolysed vegetable protein (HVP)
  • Infant formulas, soya-based
  • Lecithin (extracted from soya oil, though safe for a majority of soya-allergic people)
  • Meat alternatives (meat analogs)
  • Miso
  • Natto
  • Non-dairy soya frozen dessert
  • Oyster sauce (most brands contain soya protein)
  • Soya cheese
  • Soyafibre
  • Okara
  • Soya bran
  • Soya isolate fibre (also known as structured protein fibre [SPF])
  • Soya flour (used in most muffins, some doughnuts, many breads, and other bakery goods)
  • Soya grits
  • Soya protein concentrate
  • Soya protein isolates (isolated soya protein)
  • Soya protein, textured
  • Textured soya flour (TSF)
  • Textured vegetable protein (TVP)
  • Tuna (canned, “packed in water”—read the fine print: most contain vegetable broth, which is made from soybeans)
  • Soya sauce (tamari, shoyu, teriyaki sauce)
  • Soya yoghurt
  • Soya beans, whole
  • Soya milk and beverages
  • Soya nut butter
  • Soya nuts
  • Soya oil (though safe for a majority of soya-allergic people)
  • Sprouts, soya
  • Tempeh
  • Tofu and tofu products
  • Vegetable broth (frequently contains hydrolysed vegetable protein from soya)
  • Whipped toppings, soya-based
  • Yuba

Best bets

Many soya-free alternatives to meat are available today. The Internet is a good place to get recipes and learn how to cook with these foods. Some helpful resources are listed below.

Vegetable and grain alternatives Some manufactured vegetarian products, such as “veggie” burgers, are made with vegetables and grains instead of soya protein. However, it is important to read labels to be sure no soya has been added to the product. These products may contain any combination of vegetables and grains, such as oats, rice, wheat, chickpeas, mushrooms, potatoes, corn, lima beans, green beans, peas, carrots, nuts, and others.

Gluten and seitan Wheat gluten is made when wheat flour is mixed with water and kneaded, and then is processed to remove the starch and bran. The result is a high-protein, low-fat food. Wheat gluten and seitan (a form of wheat gluten) can be used in sandwiches, soups, and stir frys, as “steaks,” and as a meat replacement in many other dishes. These products can be found in the refrigerated section of most health food stores, near the tofu.

Soya-free milk If you are not a vegan, allergic to milk protein, or lactose intolerant, cow’s milk is always an option. Low-lactose whey milk may be suitable for some lactose-intolerant individuals, but not for those with allergies. Some people are allergic to both soya and cow’s milk protein. Rice milk and almond milk are two dairy-free /soya-free milk alternatives.

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Are there any groups or books?

American Academy of Pediatrics Guide to Your Child’s Allergies and Asthma: Breathing Easy and Bringing Up Healthy, Active Children by Michael J. Welch, MD. New York: Villard Books, 2000.

American Academy of Allergy, Asthma and Immunology
www.aaaai.org

Food Allergy Network
foodallergy.org

Interational Food Information Council Foundation
www.ific.org/

Veggies Unite
www.vegweb.com/

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Bibliography

Crevel RW, Kerkhoff MA, Koning MM. Allergenicity of refined vegetable oils. Food Chem Toxicol. 2000;38:385–93.

Foucard T, Malmheden Yman I. A study on severe food reactions in Sweden--is soya protein an underestimated cause of food anaphylaxis? Allergy1999;54:261–5.

Lee, EJ; Heiner, DC. Allergy to cow milk. Pediatrics in Review1986;7:195–20.

Porras O, Carlsson B, Fallstrom SP, Hanson LA. Detection of soya protein in soya lecithin, margarine and, occasionally, soya oil. Int Arch Allergy Appl Immunol 1985;78:30–2

Vidal C, Perez-Carral C, Chomon B. Unsuspected sources of soybean exposure. Ann Allergy Asthma Immunol. 1997;79:350–2.

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