I'm not allergic to anything. It's quite scary how today so many people are allergic to so many things, once again proof of how we are devolving as a species due to too much protection.
With respect to dairy allergies and lactose intolerance, I don't think it has anything to do with too much protection. Humans were never meant to consume bovine (cow's) milk and most people live with side effects that they have no clue about or
in most cases are not even aware that they have the side effects because they have had them all of their life and put them down to something else. An example, most of my husband's family suffer from sinus problems. When they stayed with us in our last home their sinus iussues cleared, then they returned home after a week with us and their sinus problems returned - the answer was cow's milk. At the time I was living off goat's milk and had simply cooked and served them with goat's milk instead. They had not noticed any difference except for their sinus issues clearing up. Now they all drink goat's milk routinely, as well as cook with it - sinus issues gone. It's not an allergy, simply an 'intolerance' but it is nothing to do with modern food manufacture (though the excess of dairy in modern food is alarming) or protection (my in-laws are well into the 70's grow their own veg, cook most things from scratch etc), it is more to do with the fact that humans never evolved to consume dairy products from any source.
From my intolerance point of view (excluding my actual allergic response to bovine dairy products), non-bovine dairy products (goat/sheep/buffalo etc) agreavate my asthma because their consumption increases mucus production and also increases the thickness of mucus production. Both of these cause me to cough more, longer and harder which exaserbates my asthma particularly at night when the body is at its weakest. That is an intolerance, symptons I lived with all of my life.
If you went back to the original hunter gather foods, you would still have people allergic to nuts for instance. I think we simply see more of it nowadays because medicine is better at saving these people when they do go into anaphyalatic shock and they survive to adulthood to pass on the allergies to their offspring - something natural selection 'dealt' with before. (hard yes, but for your reference: I am one such individual - I would never have survived being born, let alone the twice I have been resucitated due to my asthma were it not for the advances in medical science - I now take 8 sets of meds to control my asthma and then have to take steriods to control the side effects of my asthma medication - not enough natural steriod production - all of that is down to medicine keeping me alive to pass on 'faulty' genes passed onto me by my father: it has nothing to do with too much protection - I can drink almost any water supply without the need to filter and don't bat an eyelid about the state of my cyclign water bottle or what is on it - I have lived off a private untreated water supply most of my life and spent 12 months living on the road and that was when I was most healthy).
If anything, those of us with intolerances or allergies to dairy products are probably closer to those hunter/gathers of our past (and not more/over protected), than those who have evolved to handle consumption of something we never previously had in our diet and that has only recently (on an evolution time scale) entered into our diets.
Anyhow, those are just my thoughts on the matter - I am not saying this as a staff member, just as another forum user.