A new artificial intelligence (AI) tool has mapped how obesity affects the entire body at the cellular level, revealing widespread damage far beyond fat tissue.

The study, published in Nature, was led by researchers at Helmholtz Munich, Ludwig Maximilian University (LMU) in Munich, and collaborating institutions.

The AI framework, called MouseMapper, builds a detailed 3D “atlas” of the whole body. It identifies organs, nerves, and immune cells across tens of millions of structures at once.

Until now, scientists could only study disease changes organ by organ. This system allows a full-body view in a single analysis.

How the AI maps the body