Kathleen:  There are excellent guidelines regarding maternal nutrition
during lactation in the monograph, Nutrition During Lactation, from the
National Academy Press, Washington,  1991.  Although they describe women
at risk for nutritional deficiencies, including adolescent and poor
women, they give good guidelines for dietary counselling in these cases,
and they have no documentation of any women seriously hurt by
breastfeeding.
There are a couple of things that bother me about the situation you
describe, not least of which is the fact that the LC needs to find
literature to prove benefits.  What about having this dietitian provide
literature demonstrating that women have been hurt by breastfeeding?
When I hear about someone so hostile and so sure she would never change
her mind, I have to wonder if there is something personal in this.  Maybe
she has seen a case which she attributed to breastfeeding, and could be
encouraged to talk about it.  If she feels this strongly, it's likely
that no literature would change her mind.  Let's hope that the head of
her department and other people in authority are more supportive, or at
least more open-minded.  Alicia.  [log in to unmask]