That's not quite the same thing, this is specifically about the allergen itself needing to be introduced vs. avoided. The "hygiene hypothesis" as you said is mo

That's not quite the same thing, this is specifically about the allergen itself needing to be introduced vs. avoided. The "hygiene hypothesis" as you said is more a general idea that the immune system should be exposed to a wide variety of foreign or pathogenic material in early age. The avoidance of allergens was a deliberate thing under prior advice, and/or them being less common in the diet to begin with, it's not really a matter of hygiene or cleanliness.