Corn

Some medical research suggests that excessive levels of omega-6 fatty acids, relative to omega-3 fatty acids, may increase the probability of a number of diseases and depression.Modern Western diets typically have ratios of omega-6 to omega-3 in excess of 10 to 1, some as high as 30 to 1, partly due to corn oil which has an omega-6 to omega-3 ratio of 49:1. The optimal ratio is thought to be 4 to 1 or lower.
A high intake of omega-6 fatty acids may increase the likelihood that postmenopausal women will develop breast cancer.Similar effects were observed on prostate cancer.Other analysis suggested an inverse association between total polyunsaturated fatty acids and breast cancer risk.