Peanut and tree nut allergy are two different things
A peanut is a legume that grows underground, botanically closer to a pea than to an almond. Having one of these allergies says nothing certain about having the other, though a good many people have both.
What the labelling rules give you here
This is one area where labelling law genuinely helps. In the United Kingdom and European Union, peanuts and tree nuts are both among the fourteen allergens that must be emphasised in the ingredients list, and tree nuts must be named specifically rather than lumped together. A label saying nuts without saying which is not meeting the requirement; it should say almond, hazelnut, walnut, cashew, pecan, Brazil nut, pistachio or macadamia.
What the rules do not cover is cross-contamination. May contain nuts, not suitable for nut allergy sufferers and produced in a facility that also handles nuts are all voluntary statements with no legal definition and no required testing threshold behind them. Manufacturers apply them inconsistently and defensively, which is why the absence of such a warning is not a guarantee, and its presence does not tell you how much risk is actually involved.
Where nuts turn up under other names
Marzipan and frangipane are almond. Praline and gianduja are hazelnut. Nougat commonly contains almond or pistachio. Pesto is traditionally pine nut but is frequently made with cashew instead, and the label is where that is settled. Many South Asian curries, korma especially, are thickened with ground cashew or almond. Mortadella contains pistachio. Baklava and many Middle Eastern pastries are built on walnut or pistachio.
Satay sauce is peanut, and so are many West African and Southeast Asian sauces where the word peanut does not appear on the front of the packet. Groundnut and arachis are both names for peanut, arachis being the one that turns up in pharmacy products and cosmetics rather than food.
Oils, and why the answer is not simple
Highly refined peanut oil has had the protein removed during processing, and the clinical consensus is that most people with peanut allergy tolerate it. Cold-pressed, expelled, extruded or gourmet peanut oil retains protein and does not carry that reassurance. European labelling requires the allergen to be declared either way, but a product may simply say vegetable oil where the oil is not an allergen, which is why the distinction matters when reading unfamiliar labels abroad.
This is exactly the kind of judgement that belongs with an allergist who knows the individual case rather than with a general rule, particularly where reactions have been severe.
The things that sound like nuts and are not
Nutmeg is a seed, not a nut. Water chestnut is an aquatic vegetable. Shea nut is used in chocolate as a cocoa butter substitute and rarely causes a reaction. Pine nut is a seed, though it is regulated and reacted to as a tree nut often enough to be treated as one.
Coconut is the contested one. Botanically it is a drupe rather than a nut, and most people with tree nut allergy tolerate it without difficulty. United States labelling law nevertheless classifies it as a tree nut, so American products declare it, while European rules do not include it in the fourteen. That difference is a labelling decision rather than a biological one.
Names worth knowing
Nuts worth recognising on sight, with the other names each appears under. The names that matter most are the ones that never contain the word nut.
A selection, not the full list.
Check a whole label at once
Recognising these by eye is the hard way to do it. Photograph the ingredients panel and NoshWise reads every line against this profile, names what to avoid, and says why.
Scan a labelCommon questions
Is a peanut a nut?
No. A peanut is a legume that grows underground, botanically closer to peas and lentils than to almonds or walnuts. Peanut allergy and tree nut allergy are separate conditions, though many people have both.
Is coconut a tree nut?
Botanically it is a drupe, not a nut, and most people with tree nut allergy tolerate it. United States labelling classifies it as a tree nut so American products declare it, while European rules do not include it among the fourteen allergens. Check with your allergist rather than assuming either way.
Is peanut oil safe with a peanut allergy?
Highly refined peanut oil has the protein removed and is tolerated by most people with peanut allergy. Cold-pressed, expelled or gourmet peanut oil retains protein and is not considered safe. This is a decision to take with an allergist, particularly after a severe reaction.
Does may contain nuts mean a product is unsafe?
It is a voluntary warning with no legal definition or testing threshold behind it, applied inconsistently between manufacturers. It signals that cross-contamination is possible, not how likely or how much, and its absence is not a guarantee of anything.
Is nutmeg a nut?
No. Nutmeg is the seed of a fruit and is unrelated to tree nuts despite the name. Water chestnut is likewise a vegetable rather than a nut.
Other guides
- Vegan: the animal ingredients that hide on a label
- Halal: the ingredients a label leaves unresolved
- Celiac and gluten: the ingredients that catch people out
- Vegetarian: the animal ingredients that are easy to miss
- Buddhist vegetarian: what a label does not tell you
- Jain: the ingredients a label will not flag for you
- Kosher: why the ingredients list cannot settle it
- Kidney diet: the phosphorus that is not in the nutrition table
- Milk allergy and lactose intolerance are not the same problem
- Soy allergy: the two questions worth separating
- Fish allergy: where fish arrives without the word fish
- Shellfish allergy: two groups, declared separately
- Wheat allergy is not the same as celiac disease