Article about Stonehenge around 2500 BC:
The presence of dairy food poses a puzzle, however. Genetic evidence indicates that Britons at this time were lactose intolerant. Drinking milk would have made them ill. Yet dairy foods appear to have had widespread use.
This has led Craig and other scientists to argue that cow’s milk would not have been consumed directly but would have been turned into cheese and yoghurt – which would not have triggered lactose intolerance reactions. In other words, people gathering for these festivals would have been eating protein-rich dishes of butter and cheese and other processed dairy products.
I can't help but consider the widespread use of lactose in formulations of medicines madness. And this reinforces that it is not some johnny-come-lately issue from modern farming and food production and just some fashionable thing to have. No, it isn't a fad, it is deeply rooted in the ancient British populations - as well as many other derivations.
(The obvious problem being getting reformulations which don't then do what levothyroxine from Merck Sante and Teva are doing - negatively affecting patients even more than the the lactose!)