I used to work at an immunotherapy clinic. So, firstly, you could get rid of your allergy by being exposed to it and building antibodies which eventually made you immune (supposedly, theoretically). It's also possible that you were never allergic in the first place. Chris Kresser says that allergy tests may be garbage entirely. You can choose to agree or disagree or remain skeptical, but for that matter, we can even question our notion and understanding of allergies altogether to be false/incorrect.

Aside from all that, I tested positive for dustmites. I used to have to blow my nose in the shower every morning and no longer do. Maybe I lost my allergy, maybe I became immune to it, maybe the congestion was caused my some other factor. It is possible to develop new allergies and probably to simply lose sensitivities to former allergies.

I'd question whether allergies are present in natural environments/prior to Western diets. Of course minimizing processed foods is probably your best bet in avoiding the development of new allergies if anything can be done dietarily.

Back in high school I tested positive for nearly every allergen with the skin prick test, now I test positive for none. I think eating an anti-inflammatory diet rich in grass-fed meat, wild fish, fruits, and vegetables is key, as is avoiding soy/corn/canola oils + refined carbs.

Roughly speaking, an allergy is just your immune system overreacting to an environmental irritant. If you're eating a SAD with a leaky gut, your immune system is already turned on pretty high fighting that, so when you get another irritant (e.g., the dust mites) it pushed your immune system over the threshold and you get all the allergy symptoms. If you eat a low-inflamitory, auto-immune safe, paelo-inspired diet then your immune system should calm down and "allergens" won't push you over the threshold. That's why most allergy medication is just some form of immunosupressive.

Theory: that's why "kids these days" are allergic to everything. Their diet is so bad that everything causes an overreactive immune response.

I had debilitating seasonal allergies/hayfever for 35 years. I'd get a shot of Kennelog (spelling?) a powerful steroid each spring, pound down the over the counter meds, and use ANY alcohol/benadryl combo just to get some sleep. This was from March to Sept. Hideous. Going "paleo" (elimination of grains, sugars/sweeteners and seed oils) cleared it up like flipping a switch.

Addressing any digestive issues and getting on a great diet that works for you are key components in healing leaky gut that causes environmental and food allergies and sensitivities. That said though, some people are destined to continue to react to certain stimuli regardless of health improvements. People who address the underlying causes of allergies prior to having children are definitely upping the odds that their offspring will not suffer the same allergic fate. There is never a guarantee, but even if improvement isn't obvious for several generations, the alternative is the potential die off of our species.

I used to have horrible springtime allergies. The first time I went paleo, I was pleasantly surprised that my allergies didn't show up when spring came rolling around. I took a break for a few years and they weren't completely gone, but they were diminished. I think Melissa is right about overall inflammation playing a role. I still seem to have a bit of a mold allergy but my fingers are crossed it will ease up with time and further healing.

My son was born with asthma, eczema & allergies had suffered all his life until we went paleo - no sugar, wheat, beans, etc, etc - it is like he is a different person now no symptoms at all - his doctor thinks it's almost a miracle and is using some paleo ideas for her other asthma patients now.