Processed dairy, wheat at least but all gluten and sugar... the less you have of this stuff the better when it comes to allergies and asthma...

Vaccines also play a role in allergies and asthma - this may be a controversial topic for many but the research is pretty clear when you look into it. Not only are vaccines dangerous and damaging but the evidence on effectiveness is pretty sad. What doctors are told and what the evidence actual is are very different...

Anyway, since most of us have been vaccinated what can be done on the harmful effects years later (which include contributing to allergies and asthma etc)?

One of the top recommendations from a great documentary on vaccines (I can look up the title if anyone is interested) for minimizing harmful effects years later (and also info if you are forced to get vaccinated - most cases in most ways it is not the law though they make it seem like it is) is homeopathy.

Finding someone who has a good rep is always key in anything...
I would also consider EFT on harmful effects of vaccinating...

(Jackie's, my fiancee, brother died from vaccination - truth is side effects are not reported...no matter what happens after getting vaccinated it is never written up as a possible cause or contributing factor so the numbers aren't there on the surface... there is lots of research though if one chooses to look. With a baby on the way Jackie wanted to look into it some more, even with a death in her family the programming runs deep and the research doesn't even leave a question - I had already done research before and she wanted to do it for herself. My programming was pretty much broken on this one but looking at what she found certainly finnished it off..)