Women who eat lots of tuna, salmon and other foods rich in omega-3 fatty acids such as EPA and DHA are less likely to develop endometriosis than those whose diets are rich with trans fats. The study of more than 70,000 American nurses found that women who ate the most omega-3 fatty acids were 22 percent less likely to be diagnosed with endometriosis than women who ate the least. The major sources of trans fats in the study were fried foods from restaurants, margarine and crackers. See http://www.raysahelian.com/endometriosis.html