In the past year, science has shown there's a link between gut bacteria and food allergies. Cathryn Nagler of the University of Chicago showed that a particular gut bacteria called Clostridia blocked peanut allergies in mice. Here is an article describing her study. Nagler's team suggested that increasing our gut bacteria with probiotics may help or even prevent food allergies in people. One way to do this, according the Chris Kresser, is to eat cultured foods like sauerkraut. It turns out sauerkraut is not only allergen-free but also delicious.
Most of the sauerkraut you can find in the supermarket is not 'alive' with beneficial bacteria, and the brands that are tend to be pretty expensive. It turns out that making your own sauerkraut is not only cheap but also quite easy!