University of Exeter Feb 4 2026 Researchers have quantified the role of obesity in common long-term conditions, showing for the first time the effect of losing weight in preventing multiple diseases.  Conditions that often occur together may share an underlying cause, which can be key to prevention or treatment. The picture of which conditions co-occur is complex, so researchers paired them together, to allow them to identify shared causes more simply. The study found that obesity is the main