Science News from research organizations Losing weight in midlife may have a hidden brain cost Date: December 28, 2025 Source: Ben-Gurion University of the Negev Summary: Weight loss restored healthy metabolism in both young and mid-aged mice, but the brain told a different story. In mid-aged animals, slimming down actually worsened inflammation in a brain region tied to appetite and energy balance. While this inflammation eventually subsided, brain inflammation has been linked to cognitive decline and neurodegenerative disease.