[heartwood]

Not all the lactose gets converted at once. There is a local dairy that sell lactase-treated milk. The day you buy it, it tastes like regular milk. If you keep it for 12 days, (it’s super-fresh so you can) it is intolerably, weirdly sweet as all the lactose has been converted by then. Probably would be okay to drink then, but who would want to.

I have intermittant lactose intolerance and I can not handle a cup of milk when it’s bad. My brother has it bad all the time. These scientists would not want to be in the same room with my brother if he drank milk.

[muawiyah]

One of my great grandfathers had the problem so bad he'd go into projectile vomiting if someone inadvertently used a glass that'd just held milk was used to serve him water.

He was a platinum blond and that may have had something to do with it. And yes, he regularly went barefoot in the snow while doing farm work.