I subscribe to the "LACTNET" emails (for LCs - even though I'm not even an LLL Leader! LOL), and saw this interesting blurb in one of the posts:
". . . one suggestion is to decrease the mother's intake of PUFA's. Additionally, avoiding or decreasing foods and water with high free iron or copper content."
There weren't any citations, but still very interesting information from an expert (Jenny Doncon, Breastfeeding Counsellor, IBCLC, Australia)
PUFAs are polyunsaturated fatty acids, and include omega-3s and omega-6s. Someone mentioned flax seeds being the apparent cause of their issues at some point on this thread (I don't have the energy to see if I can figure out who, though).
I take iron supplements due to a strong tendency towards anemia, so the "high free iron" would describe me. Unfortunately, I develop a whole host of health problems if I don't take the supplements, so I guess I'll just have to keep scalding.
Just throwing this out, in case anyone else thinks it might be useful for them