Most of the health advice women have been following for decades is either outdated, oversimplified, or directly contradicted by the research. From “always finish your antibiotics” to “eat less to lose fat,” doctors and researchers have updated the guidance on all of it — and for women in perimenopause trying to change their body composition, believing the wrong myths can cost you years of effort with nothing to show for it. Here are ten of the biggest ones worth leaving behind.