When it comes to food allergies, peanut allergies are one of the most deadly. But hope may be on the horizon for people who are allergic to peanuts after a new study has revealed how a particular oral treatment can be effective for up to four years after it is administered. For the study, children were given a probiotic with a peanut protein every day for 18 months. One month later, the children were tested to see whether they could tolerate peanuts without displaying any allergic symptoms – 80% could. Then, after four years, the children were tested again. This time 70% were still able to eat peanuts without showing any allergic symptoms. Lead researcher Prof Mimi Tang, from the Murdoch Children’s Research Institute in Melbourne, said: "The importance of this finding is that these children were able to eat peanuts like children who don't have peanut allergy and still maintain their tolerant state, protected against reactions to peanuts”. She added that this is the first time a peanut allergy treatment has proved effective for this long. The Australian research team now wants to determine whether the treatment has improved the children’s quality of life. More than 250 million people worldwide are thought to have peanut allergies – a figure that has more than trebled in the last 20 years alone.