The short answer is no. You cannot have an allergic reaction to the smell of a food. This does not mean you cannot have a reaction to airborne food particles, just that they are not the same thing.
Often when airborne reactions get reported in the media, we are told someone reacted to the smell of the food. I understand, as an ex-journalist, that they want to simplify the situation and it makes for an easier headline but it is factually incorrect.
What is the difference between the smell and airborne food particles?
To have an allergic reaction to a food, your body needs to come into contact with the food proteins. These are not released in the smell of a food. The proteins only become airborne when the food is cooked or disturbed in a way that makes tiny food particles release into the air.
This means that you can smell peanut butter, be near someone eating an egg sandwich or walk past the fish market without any real risk.
When do food particles become airborne?
Food particles usually become airborne in three main ways:
- During certain cooking processes like frying or boiling, when the food is dispersed and miniscule amounts can break off into the air.
- During food preparation when milk is frothed or wheat flour is used and distributed into the air.
- When food is disturbed and releases particles – so when a bag of nuts is opened and dust escapes into the air nearby or when seafood is cracked and juices spray out.
How common are airborne reactions?
It is difficult to say how common airborne reactions are as some people may be susceptible but never in a situation where they are affected. Severe, anaphylactic reactions are very rare. People are more likely to experience watery eyes, itchy throat or a slightly tight chest without symptoms progressing any further.
How can I avoid an airborne reaction?
Most the time it is safe to be around people eating or cooking the food you are allergic to. It is sensible to avoid situations which present more of a risk like seafood restaurants, cafes or bakeries if you know you have a severe reaction to certain foods.
Usually, leaving the area, getting some fresh air and taking antihistamine or an inhaler can dull the reaction but be sure to always carry your adrenaline injectors and use them at any sign of anaphylaxis.