Scientists at the University of Illinois have found that free fatty acids in the blood appear to boost proliferation and growth of breast cancer cells. The finding could help explain obese women’s elevated risk of developing breast cancer after menopause.

A class of molecules formed when the body metabolizes omega-3 fatty acids could inhibit cancer’s growth and spread, University of Illinois researchers report in a new study in mice. The molecules, called endocannabinoids, are made naturally by the body and have similar properties to cannabinoids found in marijuana – but without the psychotropic effects.