Cooking Without Gluten, Nuts, or Soy: A Practical Allergen Guide

The short version

Cooking vegetarian without gluten, tree nuts and soy is entirely workable, but only if you treat these as three separate problems rather than one. Gluten covers coeliac disease, wheat allergy and non-coeliac gluten sensitivity, which have different mechanisms and different thresholds. Tree nuts involve an IgE-mediated allergy that can be severe and usually lasts for life. Soy is a common allergen in infancy, often outgrown during childhood, and rarely the cause of severe reactions in adults.

Three practical points matter more than the rest. First, never cut gluten before you have been tested: the NHS is explicit that you must keep eating gluten during testing, otherwise the coeliac results will be inaccurate. Second, in Switzerland and the EU, a “may contain traces” warning is optional below certain limit values, so its absence proves nothing. Third, cross-contamination in the kitchen, at home and in restaurants, causes more incidents than recipe mistakes do.

The rest of this guide covers the medical basics, how to read a label properly, the substitutions that genuinely work in a kitchen, the nutritional traps of excluding three food families at once, and five recipes built around all three constraints.

Three exclusions, three different logics

The most common mistake is treating “gluten-free, nut-free, soy-free” as a single category. The risk levels and tolerance thresholds have little in common.

Gluten: three situations people confuse

Gluten is a group of proteins found in wheat (including spelt and Khorasan wheat), barley and rye. According to the NHS, coeliac disease is an autoimmune condition: the immune system attacks the lining of the small intestine, which damages the body’s ability to absorb nutrients. It affects at least 1 in 100 people in the UK, with more reported cases in women than men, and it can develop at any age.

Digestive symptoms include diarrhoea, stomach aches, bloating and flatulence, indigestion and constipation. The NHS also lists general manifestations: fatigue caused by malnutrition, unintentional weight loss, an itchy rash called dermatitis herpetiformis, fertility problems, peripheral nerve damage and disorders affecting coordination, balance and speech. In children, growth may be slower than expected and puberty delayed.

There is no cure. A strict gluten-free diet controls symptoms and prevents long-term complications, notably osteoporosis, iron deficiency anaemia and vitamin B12 or folate deficiency anaemia. These complications mainly affect people who continue eating gluten or who have not yet been diagnosed.

Wheat allergy is a different mechanism, immediate and allergic in nature. One useful detail: some people with wheat allergy tolerate barley, rye or oats, which is never the case in coeliac disease.

Non-coeliac gluten sensitivity remains a contested category. A 2018 double-blind crossover study on 59 people already following a gluten-free diet compared gluten, fructans and placebo. Intestinal symptoms, especially bloating, were borderline significantly higher after the fructan challenge than after gluten. The authors concluded that fructans, a type of FODMAP found in wheat, are more likely to explain the symptoms than gluten itself. In other words, someone who feels better without bread is not automatically gluten intolerant.

Oats deserve a separate note. Oats do not contain gluten in the strict sense, but their tolerability depends on the cultivar and they are very frequently cross-contaminated with other cereals during harvesting, transport and milling. Only oats explicitly labelled gluten-free offer a guarantee. Swiss food law in fact lists oats among the gluten-containing cereals that must be declared as allergens.

Tree nuts: an allergy that tends to stay

Tree nuts include almonds, Brazil nuts, cashews, chestnuts, hazelnuts, macadamia nuts, pecans, pistachios and walnuts. Prevalence varies with age, country and how the allergy is defined, in a worldwide range of 0.5% to about 4% of the population.

Two features matter in the kitchen. This allergy persists: fewer than 10% of people outgrow it into adulthood. And cross-reactivity is common. Reviews of human trials report that up to one third of people with a confirmed tree nut allergy react to more than one type. Cross-reactivity is stronger among almond, walnut, pecan, hazelnut and Brazil nut than it is toward cashew or pistachio, because walnuts and pecans are only distantly related to cashews and pistachios and do not necessarily share the same allergenic proteins. Between 25% and 40% of people allergic to peanuts also have an allergy to at least one tree nut. In Europe, hazelnut is the most common tree nut allergy.

Peanuts are not tree nuts. They are legumes, like peas, chickpeas and soybeans. That botanical distinction has practical consequences, since the allergenic proteins only partly overlap.

Soy: common, but rarely severe in adults

Soy allergy affects roughly 0.3% of the general population. It often begins in infancy, sometimes as a reaction to soy-based infant formula, and most children outgrow it.

The triggering dose is generally higher than for other allergens. In someone with a mild soy allergy, the dose needed to provoke a strong reaction is around a hundred times higher than for many other food allergens. Severe forms do exist and can react to traces, but anaphylactic shock is rare unless the person also has asthma, a peanut allergy or other complicating factors.

Two derivatives need nuance. Highly refined soybean oil contains little to no soy protein and is generally considered safe, whereas oils extracted by mechanical pressing or extrusion alone should still be avoided. Soy lecithin, usually derived from soybean oil, contains minimal amounts of soy protein, which has not stopped the FDA from requiring allergen labelling for it with few exceptions. In practice this is a decision for the person’s allergist, not for a recipe blog.

How many people are actually affected

Figures on food allergy are often inflated because they mix perception with diagnosis. A systematic review and meta-analysis published in Allergy in 2022, pooling 110 European studies, estimated point prevalence of self-reported food allergy at 13.1% and IgE sensitisation at 16.6%, but prevalence confirmed by oral food challenge at only 0.8%. Heterogeneity between studies remained very high, so these numbers deserve caution.

In Switzerland, aha! Swiss Allergy Centre estimates that roughly 2% to 6% of the population is affected by a food allergy. The gap between what people report and what testing confirms is exactly why an elimination diet should follow a diagnosis rather than a hunch.

Reading a label without getting it wrong

Switzerland requires the declaration of fourteen allergenic ingredients and their derivatives: gluten-containing cereals (wheat, spelt, Khorasan wheat, rye, barley, oats and their hybridised strains), crustaceans, eggs, fish, peanuts, soy, milk including lactose, tree nuts with the specific type named, celery, mustard, sesame seeds, sulphur dioxide and sulphites above 10 mg/kg or 10 mg/l, lupin and molluscs.

Three concrete rules follow from the Swiss ordinance on food information.

Allergens must stand out visually in the ingredient list, in capitals, bold, underlined or by another appropriate method. Where there is no ingredient list, a “contains” statement is used, as on wine bottles that state “contains sulphites”.

The source must be explicit. A label has to say “soy lecithin” rather than simply “lecithin”. That detail matters when you are hunting for an allergen hidden inside an additive.

Trace labelling works in a way many shoppers read backwards. Allergens present unintentionally, through contamination, must be declared only if they exceed or risk exceeding certain limit values. Below that, the statement is optional. A package with no trace warning therefore does not guarantee the absence of traces. That is the opposite of the intuitive reading, and correcting it matters more than any recipe tip.

In the United States, the 2004 FALCPA law identified eight major food allergens. The FASTER Act, signed in April 2021, added sesame as the ninth major allergen, effective 1 January 2023. The FDA also notes that more than 160 foods have been identified as causing allergic reactions in sensitive individuals, which puts any closed list in perspective.

The lupin trap in gluten-free products

Lupin is a legume in the same plant family as peanuts. Lupin flour and lupin protein are increasingly used in baked goods and pasta, and specifically in gluten-free products, because they add fibre, texture and protein without wheat.

The American Academy of Allergy, Asthma & Immunology reports cross-reactivity with peanut as high as 44% on skin prick testing, with lower clinical reactivity rates that vary widely between studies and patient populations, from 5% to 37%. The FDA states that reactions to lupin can be severe and life-threatening, that people with peanut allergy are most at risk, and that lupin allergy can also occur in people who are not peanut allergic. Lupin is also used as a soy substitute in some products.

The practical consequence for this guide: an industrial product marked “gluten-free, soy-free” can contain lupin. Lupin is one of the fourteen allergens that must be declared in Switzerland, so it is visible on the label, provided you look for it.

Setting up a kitchen where cross-contamination fails

For coeliac disease, the tolerated quantity is tiny. Inadvertent cross-contamination is the main reason intestinal recovery stays incomplete despite a diet the person believes is strict. Domestic sources are ordinary: preparing gluten-containing and gluten-free food on the same surfaces, sharing a cutting board, a colander, cutlery, a toaster or a butter dish that a crumbed knife has been through.

Restaurants are the second weak point. A study conducted by Columbia University Medical Center found that 32% of foods labelled gluten-free in restaurants contained more than 20 parts per million of gluten, above the threshold at which Codex Alimentarius no longer considers a food gluten-free.

A few measures cut the risk substantially at home. Clean surfaces before you start rather than after, since airborne flour settles long after use. Dedicate a board, a colander and a toaster to gluten-free preparations, or use toaster bags in a shared appliance. Store allergen-containing products in closed, labelled boxes on a lower shelf so powders cannot fall onto other food. Cook the allergen-free version first, then cover it and put it away before preparing anything else. Serve with separate utensils, so no spoon travels between dishes.

Your rights in restaurants and at the bulk counter

Many people do not realise that Swiss rules do not stop at packaging. The Federal Food Safety and Veterinary Office states that consumers have the same right to information for food sold loose as for pre-packaged products. Loose sale covers food that is not pre-packaged, food packed on the spot at the customer’s request such as a croissant slipped into a paper bag, and food pre-packed for immediate handover such as a takeaway salad of the day. Restaurants, takeaways, bakeries and butchers are typically covered, and increasingly so are retail shops.

The rule for allergens works like this: they must in principle be declared in writing, unless it is stated in writing that the information is provided verbally. In that case staff must have written notes available, or an informed person must be able to answer.

In practice, in a Swiss restaurant you are entitled to ask what is in a dish, and the establishment is obliged to be able to answer. A vague “I think it’s fine” shouted from the kitchen does not meet that requirement. Ask a closed, checkable question: “does this dish contain wheat flour, tree nuts or soy, including in the sauce and the marinade?” rather than “is this gluten-free?”. Also ask whether the fryer is shared, a classic blind spot in professional kitchens where breaded items and chips sit in the same oil.

Given the 32% of restaurant dishes labelled gluten-free that still exceeded the 20 ppm threshold in the Columbia University Medical Center study, caution remains sensible even in well-meaning establishments.

Planning your shopping and your meals

Organisation matters more than cooking skill in a kitchen with three exclusions, because it cuts the number of decisions made under time pressure, which is when most mistakes happen.

Build a verified store cupboard once and reuse it: rice, quinoa, millet, hulled buckwheat, red and green lentils, chickpeas and beans dried or tinned, rice, buckwheat and chickpea flours, sunflower, pumpkin, flax and chia seeds, coconut milk, olive and rapeseed oil, whole spices rather than ready-made blends. Commercial spice mixes frequently contain anti-caking agents or wheat-based carriers.

Photograph the ingredient lists of products you have cleared. Manufacturers reformulate without notice, but keeping a record spares you re-reading every label on every shopping trip and helps you spot a change faster.

Cook double batches. A lentil soup, a curry or a tomato sauce base freeze well and spare you the improvised fallback meal. See also our step-by-step method for vegetarian batch cooking and the ideal pantry for a beginner vegetarian.

Finally, keep a portable backup for meals away from home. A few rice cakes, dried fruit without added sulphites and a tin of chickpeas will do more for you than hunting for a compatible restaurant at ten to twelve. Our article on surviving company meals as a vegetarian covers this from another angle.

Substitutions that actually work

Replacing wheat flour

No single gluten-free flour reproduces the elastic network gluten forms. Blends almost always outperform a single flour.

Rice flour is neutral and light, suited to cakes, biscuits and thickening sauces; on its own it gives a sandy texture. Buckwheat flour, botanically unrelated to wheat despite the name, brings a pronounced flavour that suits pancakes, crepes and rustic breads. Chickpea flour is dense and protein-rich, the base of Niçoise socca and Indian pakoras, but note that the NHS lists chickpeas among common allergenic foods alongside peanuts, soybeans and peas. Corn flour works for flatbreads and tortillas, though nixtamalised masa, cornstarch and fine corn flour behave very differently and are not interchangeable. Quinoa flour adds protein and a strong vegetal note best kept to a fraction of the blend.

A gum is often needed to compensate for the missing gluten. Xanthan gum is used in gram quantities per serving in some gluten-free baked goods and has been found to improve both crust and texture in bread.

One nutritional point deserves to be stated plainly, because it rarely is: commercial gluten-free products are not automatically healthier. Replacing wheat flour with gluten-free flours in commercial products can lead to a lower intake of iron and B vitamins, a higher intake of sugars and saturated fats, and greater lipid and carbohydrate content. Many of these products are not enriched or fortified the way their wheat-based counterparts are, and children in particular tend to over-consume them as snacks and biscuits. Wholemeal pseudocereals, quinoa, amaranth and buckwheat, have higher nutritional value than cornstarch-based preparations.

Replacing tree nuts

Seeds cover most uses. Sunflower and pumpkin seeds provide the crunch you want in salads, granolas and gratins, and take a light dry toasting well. Ground flaxseeds and chia seeds, mixed with water, form a gel that replaces eggs in many preparations.

Sunflower seed butter replaces nut butters in spreads and sauces. Tahini is often suggested as the obvious answer, but sesame is a declarable allergen in Switzerland and has been the ninth major allergen in the United States since 2023. It is not a neutral substitution, only a shift of the problem to a different allergen.

For creaminess, coconut milk and coconut cream deliver the richness usually obtained from a cashew sauce. Coconut occupies a particular regulatory position depending on the country, which is worth confirming with an allergist rather than inferring from an online guide.

Replacing soy

Tofu and tempeh disappear, but plant protein does not. Lentils, whether red, green or beluga, provide around nine grams of protein per 100 g cooked and work in soups, patties and sauces. Chickpeas anchor hummus, stews and homemade falafel, and chickpea flour replaces eggs in some plant-based omelettes. White, red and black beans extend the rotation. Split peas make excellent patties. Quinoa, amaranth, buckwheat and millet add protein to side dishes.

A useful reminder for everyday cooking: the worry about combining grains and legumes within the same meal is unfounded. A varied diet across the day covers amino acid needs. The NHS simply recommends eating a variety of protein sources.

Industrial substitutes need more caution. Vegetarian meat alternatives are listed among the unexpected sources of gluten, along with processed meat, reconstituted seafood, stuffings, butter, seasonings, marinades, dressings, confectionery, candies and ice cream, because gluten is used as an emulsifier, thickener, gelling agent, filler and coating.

Avoiding deficiencies when three food families are gone

Multiple exclusions mechanically narrow your choices. A few nutrients deserve particular attention.

Plant iron is absorbed less readily than iron from meat, and vegetarians are more likely to have lower iron stores. The NHS advises including a source of vitamin C with meals to improve absorption. Legumes, dark green vegetables such as watercress, broccoli and spring greens, and dried fruit such as apricots are useful sources. Note that the NHS also lists nuts, which are excluded here, which is exactly why the remaining sources matter more.

Vitamin B12 is only found naturally in animal products. People who regularly eat eggs and dairy usually get enough. If intake is small or absent, a reliable source is needed: fortified yeast extracts, fortified breakfast cereals, fortified plant drinks. Since fortified soya products are ruled out here, check the fortification on gluten-free oat, rice or hemp drinks instead. Our dedicated guide covers vitamin B12 needs and reliable sources.

Calcium comes mainly from dairy for ovo-lacto vegetarians, and from fortified plant drinks, leafy green vegetables and bread for everyone else. With calcium-set tofu excluded on soy grounds, fortification of plant drinks becomes a more important lever. See our article on balancing calcium without dairy.

On omega-3, the NHS lists flaxseed oil, rapeseed oil, walnuts, and seeds including flaxseeds, chia and pumpkin seeds as vegetarian-suitable sources. It also notes, and this nuance matters, that evidence suggests vegetarian sources of omega-3 may not offer the same benefits for reducing heart disease risk as those found in oily fish.

Finally, people with coeliac disease often need monitoring of iron, vitamin and mineral levels, since poor absorption can cause iron deficiency anaemia. Medical follow-up is justified, including a DEXA scan when bone density may be affected. This paragraph describes a monitoring framework; it does not replace individual medical advice.

Five recipes built around all three constraints

Red lentil and vegetable soup

Soften one onion and two garlic cloves in olive oil, add two carrots, a celery stick and a tin of chopped tomatoes, then 200 g of rinsed red lentils. Cover with water or a broth verified gluten-free, since stock cubes are among the most frequent sources of hidden gluten. Simmer for twenty minutes until the lentils break down. Season with cumin, ground coriander and lemon juice. Celery is itself one of the fourteen declarable allergens, so swap it for fennel if you are cooking for someone whose profile you do not know.

Vegetable and chickpea curry

Sweat onion, garlic and ginger, add your ground spices for thirty seconds to release their aromas, then cauliflower, carrots and courgettes. Add 400 ml of coconut milk and 250 g of cooked chickpeas, and simmer for twenty minutes. Serve over basmati rice. Check commercial curry pastes carefully: many contain soy sauce or peanuts.

Quinoa salad with roasted vegetables and seeds

Rinse 200 g of quinoa thoroughly to remove saponins, cook it in twice its volume of water for twelve minutes, then rest it covered. Roast peppers, courgettes and red onions at 200 °C. Combine while warm with an olive oil and lemon dressing, salt and pepper, and scatter over dry-toasted sunflower and pumpkin seeds. The vitamin C from the peppers and lemon improves absorption of the iron in the seeds and quinoa.

Split pea and grated vegetable patties

Cook 200 g of split peas until they collapse, then drain thoroughly. Grate a carrot and a courgette, salt them and squeeze out the water, a step most recipes skip and the reason patties fall apart. Mix with the mashed split peas, two tablespoons of ground flaxseed stirred into six tablespoons of water, cumin and parsley. Shape the patties, rest them in the fridge for thirty minutes, then brown them in a pan. Serve with a coconut yoghurt, garlic and herb sauce.

Gluten-free pancakes with soy-free plant milk

Mix 100 g of rice flour, 50 g of buckwheat flour, a teaspoon of gluten-free baking powder and a pinch of salt. Add 250 ml of oat drink labelled gluten-free, or rice drink, plus a tablespoon of maple syrup. Almond drink is out here, since it is a tree nut. Rest the batter for ten minutes so the flours hydrate, then cook over medium heat. A spoonful of chia seeds adds fibre and improves the structure.

Common mistakes

Cutting gluten before testing carries the heaviest consequences. The NHS is direct: you need to keep eating gluten while the tests are done, and you should not start a gluten-free diet before a specialist confirms the diagnosis, even if the blood test comes back positive.

Trusting the absence of a “may contain traces” warning is the second mistake, since that statement is optional below the limit values.

Treating “gluten-free” as a nutritional quality label is the third. Many gluten-free products carry more sugar and saturated fat and less iron and B vitamins than their wheat equivalents.

Swapping tahini in for nut butters without thinking replaces one declarable allergen with another. Using ordinary oats because they contain no gluten ignores both systematic cross-contamination and cultivar variability. And wiping the worktop after rather than before lets the previous meal’s flour contaminate the next one.

Hosting someone safely

Ask what the actual problem is before you cook. Coeliac disease, a cashew allergy and a self-reported intolerance do not call for the same precautions.

Keep the packaging until the meal is over, so your guest can read the ingredient lists themselves if a doubt comes up. Serve sauces separately. Announce what is in each dish as you serve rather than leaving people to guess.

Know how to recognise a severe reaction. The NHS lists the signs that require an immediate emergency call: sudden swelling of the lips, mouth, throat or tongue, very fast or laboured breathing, a feeling of choking or gasping, a tight throat or difficulty swallowing, skin, tongue or lips turning blue, grey or pale, sudden confusion or drowsiness, someone fainting and not waking, or a child who is limp, floppy or unresponsive. If the person carries an adrenaline auto-injector such as an EpiPen, it should be used immediately, and emergency services called afterwards even if they seem to improve. In Switzerland the medical emergency number is 144, and 112 also works.

General hygiene still applies. The WHO estimates that 866 million people fall ill each year after eating contaminated food and that 1.52 million die from it. Standard rules on cleanliness, cooking and storage do not disappear because you are focused on allergens.

Frequently asked questions

Can people with coeliac disease eat gluten-free oats? Oats labelled gluten-free are produced to avoid contamination with wheat, barley and rye. Residual toxicity still depends on the cultivar, and the long-term effects of consuming pure oats remain unclear. This is a question for the doctor managing your follow-up.

Does oral allergy syndrome apply to this diet? It causes an itchy mouth and throat after eating raw fruit or vegetables. The NHS says it is not usually serious and that eating well-cooked fruit and vegetables helps.

Is soy lecithin a problem? It contains minimal amounts of soy protein, which does not exempt it from allergen labelling. Individual tolerance is a matter for an allergist.

What is the difference between an allergy and an intolerance? An allergy involves the immune system and can cause immediate, serious symptoms. An intolerance tends to cause bloating and tummy pain, usually a few hours after eating, without the same immune mechanism.

Should the whole family be tested? The NHS recommends testing first-degree relatives of people with coeliac disease, because their risk is higher.

More on this site

Our related guides cover several angles of this topic: cooking without soy using protein-rich alternatives, alternative flours from chickpea, buckwheat and quinoa, how to read a food label as a vegetarian, how to vary plant protein sources, plant-based iron and absorption, the complete guide to egg substitutes and vegetarian batch cooking for five dinners.

Sources