It could be the food, it could be indoor air quality, it could be a beauty product, it could be pollen, any number of things.
In any case, it might be related to histamines. If your wife has any troubles with an MTHFR mutation, this can cause issues with histamine buildup [1]. I don't endorse this site generally, just a quick reference for the histamine bits.
One possible cause of this is taking folic acid (synthetic) rather than folate. This is commonly found in 'enriched' products like breads and cereals, even rice. Europe doesn't enrich products like the US does.
This is to say nothing about different pesticides and additives the Europeans use vs the US.
Anyway, try avoiding wheat and enriched foods and see if that makes any difference. My wife had a lot of these issues and others, and we've got her sorted out now.
In any case, it might be related to histamines. If your wife has any troubles with an MTHFR mutation, this can cause issues with histamine buildup [1]. I don't endorse this site generally, just a quick reference for the histamine bits.
One possible cause of this is taking folic acid (synthetic) rather than folate. This is commonly found in 'enriched' products like breads and cereals, even rice. Europe doesn't enrich products like the US does.
This is to say nothing about different pesticides and additives the Europeans use vs the US.
Anyway, try avoiding wheat and enriched foods and see if that makes any difference. My wife had a lot of these issues and others, and we've got her sorted out now.
1: https://joannekennedy.com.au/2020/01/03/mthfr-histamine-into...