Also very tangential to my ‘immigrant discovering the rest of the US’ journey:
Anecdotally, many East & SE Asian immigrants seem to be only ‘lactose intolerant’ to Clover brand milk, which is the primary source of dairy whole milk in Northern California.
On a personal note I can attest that I am not intolerant of any whole milk most other places.
This got me down a rabbit hole of trying to understand why. The best theory remains that Clover milk has A1 proteins which many of us can’t digest. It’s not scientifically proven, but on a ‘this doesn’t send us to the bathroom immediately’ scientific scale, A2 is much, much better.
Nowhere else have I experienced this other than in CA (I’ve tested this in all the other states)
(Related: this excellent post on ‘if Chinese people are lactose intolerant, why all the milk tea? Sorry it’s a *stack)
https://open.substack.com/pub/chinesecookingdemystified/p/if-asian-are-lactose-intolerant-why