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I think the difference in allergy rates between UK and Israeli Ashkenazi Jews (10x higher in UK Jews!) [1] is strong evidence for that.

Also, they sell Bamba at Trader Joe’s now.

[1] https://www.jacionline.org/article/S0091-6749(08)01698-9/ful...

Latest research does strongly suggest that introducing small amounts of common allergens (peanuts, shellfish,milk products...) as early as possible does significantly reduce risk for allergies later. Many early childhood organisations already recommend this. Official health recommendations are often slow to catch up (often for good reasons, but introducing peanuts etc. early is already officially recommended in quite a few countries (Australia, NZ, Sweden for example AFAIK). Not all health professionals are always up to date either though.

You actually don't need to self import these. Usually Safeway (is it only a west coast thing?) always have these stocked in the Kosher section.