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Soybeans

Soybeans is entry 6 of the fourteen substances Annex II of Regulation (EU) No 1169/2011 makes declarable. IgE-mediated food allergy — primary, or birch-pollen-related through Gly m 4. Where it hides, which exemptions apply, and what it cross-reacts with.

This is reference information, not a diagnosis and not a treatment plan. A pollen calendar cannot tell you what you are allergic to, and no page can clear a food as safe for you — only the label on the packet in your hand and the clinician who knows your history can do that. Anything beyond mild, short-lived symptoms in the mouth or nose — swelling that affects breathing or swallowing, hives away from the mouth, wheeze, vomiting or faintness — is an emergency question, not a reading question.

What the law says

Annex II, entry 6: “Soybeans and products thereof”

That wording carries the whole obligation. The substance must be declared whenever it is used in the making of a food and is still present in the finished product, even in an altered form, and it must be picked out inside the ingredient list by typeset — bold, capitals, italics, underlining or a contrasting colour. There is no legal requirement for a separate allergen box, so the ingredient list is where to look.

Source: Regulation (EU) No 1169/2011, Annex II and Article 21 · checked 2026-09-06

What the reaction actually is

Soy allergy in children is usually a primary allergy to soy storage proteins, often alongside milk allergy, and is generally mild to moderate. In adults in this region it is far more often something else: a birch-pollen-related reaction to Gly m 4, a PR-10 protein that is a close relative of birch Bet v 1.

Who gets it, and does it last

Childhood soy allergy is commonly outgrown. The birch-related adult form does not follow that pattern, because the underlying sensitisation is to birch pollen and that persists.

Where it hides

• Soy sauce, miso, tempeh and tofu
• Emulsifier E322 lecithin, where it is soy lecithin
• Chocolate and confectionery
• Bread and bakery improvers
• Meat products and vegetarian substitutes
• Stock cubes and marinades

Because birch dominates this region, the birch-soy route is a genuinely regional issue: plant drinks have moved from the health-food shelf to the ordinary supermarket, and a person who has had an itchy mouth from apples for years can meet Gly m 4 for the first time in a large glass of soy drink.

Cross-reactions

The birch link is the one that matters here. Gly m 4 is concentrated in unfermented, minimally processed soy — soy drinks, soy protein shakes and lightly cooked tofu — and reactions to a soy latte or a protein smoothie in a birch-allergic Northern European are documented and can go beyond an itchy mouth. Heavily processed and fermented soy, such as soy sauce and miso, carries much less of it. Soy also cross-reacts serologically with other legumes, though that rarely translates into symptoms.

The labelling detail

Entry 6 has four exemptions, all of them for highly processed fractions where the protein has effectively been removed: fully refined soybean oil, soy-derived tocopherols, phytosterols and plant stanol esters. Soy lecithin is not exempt and is declared.

Exempt from declaration under Annex II:

• Fully refined soybean oil and fat
• Natural mixed tocopherols (E306), natural D-alpha tocopherol and its acetate and succinate, from soybean sources
• Phytosterols and phytosterol esters derived from soybean vegetable oils
• Plant stanol ester produced from soybean vegetable oil sterols

Precautionary wording — “may contain”, “made in a factory that also handles” — is a separate matter: it is voluntary, unstandardised and carries no threshold. How strictly to treat it is a clinical decision, not a reading of the label. The labelling explainer sets out the whole frame, including what happens in restaurants and bakeries where there is no pack at all.

What gets misread

Soy lecithin in chocolate is often assumed to be a serious risk for every soy-allergic person; in practice the protein content is low and tolerance is common, but that is an individual clinical judgement. The opposite error is treating a soy drink as equivalent to soy sauce — for the birch-related form they are not remotely the same exposure.

Sources: Regulation (EU) No 1169/2011, Annex II · Commission Implementing Regulation (EU) No 828/2014 (gluten claims) · WHO/IUIS Allergen Nomenclature · season windows from the national aerobiology monitoring programmes of Estonia, Finland, Sweden, Denmark and Norway · cross-reaction patterns paraphrased from the allergy literature and EAACI material · checked 2026-09-06

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