Peanuts etc

I'm not supposed to eat peanuts as my hubby is allergic to them and all nuts actually. My midwife told me there were teo theories on it, one saying that you shouldn't eat them if there is a family history of allergy and another view saying that if baby has never been in contact with a substance then how can they build up and anti bodies to it? My mil thinks it has something to do with the ezema (spelling?!) cream they had when they were babies, apparently it had nut oil which they think has caused a lot of the nut allergies and I have heard that a few times from other sources too. I still eat the cashews and other nuts, but not really peanuts. I kinda think if you took every sinlge thing on board then you would spend 9 months in a bubble and put bubs into a bubble as soon as it was born! Of course this all could change next week when they find new things you can and can't do!