Obesity is today one of the most prevalent medical conditions, and has a major impact on health. Recent studies have also shown a relationship between weight and brain structure. Obesity has been associated with a reduced total brain volume and diminished gray matter density. The research team at the Max Planck Institute for Human Cognitive and Brain Sciences in Leipzig, together with the Department ofEndocrinology, University Clinic Leipzig, Integrated Research and Treatment Center Adiposity Diseases Leipzig and the University College London have shown a gender-dependent relationship between being overweight and brain structure in the brain’s white matter. (PLoS ONE, April 11, 2011.)

Changes in diffusion in the corpus callosum (marked red) are much greater in obese female participants than in their male counterparts.

Some sobering news for parental foes of sex stereotypes: A new study reinforces the devastating impact stereotypes can have on girls when it comes to math.

Little boys may love their trains and toys, but as early as second grade they're already showing prowess on the mathematical front, sending a subliminal message to their female classmates about expectations for math test scores and even potential career paths, according to a new study, "Today" reports.