I wonder if “lactose intolerance” is somehow linked to what we eat/drink nowadays and all the little additives etc in the food chain… that might have worked adversely on the digestion over the years…
There was a time in UK, when folk were encouraged to “drink a pinta milka day” … and a mug of ovaltine/horlicks/cocoa…made with hot milk… was normal at bedtime… for adults as well as children… 