SIL has developed a peanut allergy. She was born in the late 50's. She also developed a milk allergy. Bear in mind she could have had the allergy and not recognized it previously, too. She had various other allergies, such as kiwi.
With regards to the nursing stats I published, the statistics showed the US tends to nurse children for less than 6 months, and has done so historically. As the recommendation is to nurse kids for a year to 2 years, I do think the idea is still valid. The US hospital initiation rates are so high for white, college-educated women, but the 6 month duration rates are pitiful (for a LOT of reasons, keep reading). I am not professing a belief that breastfeeding is the magic bullet for allergies, but the belief that
breastfeeding for a year or more minimizes the allergies one develops, in infancy and in adulthood.
For example, my kiddo has shellfish and peanut allergies, ingestion-based. Her dad has peanut allergies, among a host of others. His mother was told he was allergic to her milk, so she had him on 3 solid foods a day by a month old. Kiddo was nursed for 2 years. She still developed 2 major allergies, but she didn't/hasn't developed the milk allergy she got from the 2 of us (mine is a minor reaction, DH's is analphylactic shock--oh yeah, he's fun to cook for, huh? *grin*).
The idea I am trying to make is that to
minimize the damage to the intestines for newborns (and therefore protect from developing allergies) it is best practice to nurse your kids for at least a year. Other countries, such as Sweden and Canada, have managed to do this, so I know it is possible. Sweden has a 97% success rate for breastfeeding.
However, the US has a bad habit of favoring pharmaceutical companies and the formula companies (who are owned by the drug companies), over public health. We also have only 6-8 weeks of maternity leave, which of course is unpaid. The US flouts international law and allows formula companies to advertise, distribute free samples, and various other illegal activities. The US also has encouraged formula use over breastfeeding via WIC services in the past. I believe the WIC programs are getting better about realizing the populations they serve are best supported if their kids receive the antibodies their mom's milk provides, versus the money for formula. The WIC programs in Colorado, Utah, and several other states even provide Medela Pump In Style pumps to working moms who want to pump for their kids for the first year--that's quite an investment!
I don't know that I agree with an increased allergy rate, frankly, because I haven't seen any official statistics. Epi-Pens were patented in 2004. I read that epinephrine was first artificially synthesized in 1904, but I don't see where it became a treatment option for most people. My grandmother's family still delivered ice for people's ice boxes in the 1930's, and my husband says his epinephrine had to be refrigerated when he was growing up (no longer necessary with Epi-Pens).
If we agree to treat the peanut allergy like the large-scale latex allergy that is developing, then we can use the latex allergy explosion as proof that repeated exposure to a relatively new allergen will result in a rapidly increasing population that becomes allergic. Citing:
http://findarticles.com/p/articles/mi_m0FSL/is_1_72/ai_64424305/pg_7 This article states that 1989 is the first time latex allergies came to the attention of the FDA.
Bear in mind I am discussing
2 types of exposures. I believe breastfeeding serves in some part as a protectant against
ingestion allergies by not causing microtears in the newborn's intestines (which cross-species artificial baby milk does) and by populating the bacterial flora. The other type of exposure relevant to peanut allergies is
contact-based, which is possibly (if we agree) a similiar reaction to latex.
What are your thoughts? I am not dismissing a host of other issues (environmental, chemical, etc), I'm just not as interested in those causes.

I don't consume aspartame because it makes me sick. I try to eat organic when it is worthwhile. I even worked for the USDA for a while in the center that "found plants that killed other plants" for weed control, and various other hippie endeavors like "what makes wine, strawberries, and raspberries good for you?"

I was their propaganda department, no less.

One thing that was pointed out to me by a scientist I worked with was the amount of hormones showing up in the water supply due to the urine from women on birth control pills. The hormones aren't destroyed by the women consuming them, but are passed out, and therefore pass into the waste water.
I'm sure there were many other points discussed on this thread equally worth mentioning here!
Brandie