High red meat consumption (1.6 servings per day) in early adulthood is
associated with a 22% increased risk for breast cancer, according to
longer-term follow-up from the Nurses Health Study II, published in BMJ.
Swapping out red meat for poultry or legumes one meal a day was
associated with significant risk reductions.

The authors conclude: “Consistent with the American Cancer Society
guidelines, replacement of unprocessed and processed red meat with
legumes and poultry during early adulthood may help to decrease the
risk of breast cancer.”

BMJ article