A friend's one month old has been diagnosed with serious allergies and she has been advised to totally cut out dairy, eggs, wheat and peanuts from her diet for as long as she is breastfeeding. Anyone have similar experience?

Yes, it is possible to cut out all the dairy, eggs, wheat and peanuts. Try to reduce taking outside food, and cook at home instead so you can have the control of the ingredients in the dishes. Here is a full list of what are the food that you need to avoid to achieve dairy-free diets and eggless diets. http://www.breastfeedingonline.com/allergy.shtml#sthash.H94AuEXY.dpbs