notb665 said:
What about: more additives and rubbish in food than there once was due intensive production because of increased demand? Just an idea.
Hmmm, yes. These days, there is lots of rubbish in food, but instead of being artificial rubbish, as in the past, now it is naturally-derived rubbish.
Let me explain: 20 years ago (incidentally, when BBE dates were in their infancy!) there was a lot of artificial stuff in food, binders, emulsifiers, colourings, all E numbers. Tartrazine & sunset yellow ( E102 & E110 respectively) were 2 that were responsible (as we found out much later) for negative effects in the diet (hyperactivity in kids).
Nowadays, there is a great emphasis towards food that contains, no artificial colours or flavours. Emulsifiers are naturally-derived (lecithin). Use of preservatives has been greatly reduced. Anybody old enough to remember tomato sauce of the 1970's will know that our parents had no need to store it in the fridge after opening. Now, almost all stuffs advise refrigeration once opened.
There has always been intensive production for processed foods, at least from the 1950's onwards. Food processing is huge business, and there is great pressure for manufacturers to compete, and they do this by bulking out the food with fillers: rusk in sausages, water & polyphosphates (these allow the meat to hold more water) in meat, to name but 2 examples. Look at a typical lowfat mayo. There is water and starch to bulk out the product, and give it the viscosity required. Then to stop the water separating out, there will be emulsifiers holding it all together. To finish, it will have something to give a bright white colour, usually titanium dioxide, or E171.
There is very little in the way of what you and I think of as the traditional ingredients of mayonnaise - oil, vinegar, egg and natural flavourings.
But I'm not sure how this ties in with food allergies, other than that explained above: ie artificial foodstuffs are known to cause certain reactions in certain children.
I personally believe that all this namby-pamby dettox and "Kills all known germs dead" is very bad news because children are no longer exposed to the bacteria that previous generations were. Hence they have no built-in resistance to infections and become hyper-sensitive. So the very parents who think they are doing pettikins a favour by saving it from the big bad bacteria, are actually doing more harm than good.
I believe the human body builds up a resistance to certain irritants, bacteria etcetera, over a period of time which eqips the body with the means to fight infection and attack by, for example, pollen.
My old Granny used to say "You have to eat a peck of dirt before you die", a peck being not the action of a bird, but a measure of weight.