The Endocrine Society Apr 2 2026 Redefining obesity based not only on body mass index (BMI) but on whether excess body fat is causing measurable health problems may complicate diagnosis and delay treatment, according to an Endocrine Society guideline communication published in  The Journal of Clinical Endocrinology & Metabolism. "How obesity is defined has real consequences for patients. Diagnostic definitions influence who qualifies for treatment, how clinicians manage care and how insurers