The narrative you are presenting is also based on common sense though. We have observations that populations of kids eating peanuts early have lower allergy ra

The narrative you are presenting is also based on common sense though. We have observations that populations of kids eating peanuts early have lower allergy rate, but it´s not like we isolated 300 babies and experimented on them for 30 years, we just can´t. Short of other stronger evidence we assume it´s true, but if tomorrow we found that there were other causes specific to the US, independent from peanuts themselves, we´d have the same reaction: we didn´t know so we did our best.