"Treasure Your Exceptions" — Studying Human Extreme Phenotypes to Illuminate Metabolic Health and Disease

This is a scientist’s award lecture rather than a standard review, and its lesson is methodological: study the rare extremes of human biology to understand the common middle. Applied to metabolism, that approach upends a comfortable assumption about obesity and diabetes.

O’Rahilly draws on rare genetic mutations and population-scale data to argue that metabolic syndrome is driven less by inflammation than by the capacity to store fat safely. When adipose tissue can’t expand to hold excess energy, fat spills into the liver and muscle, and insulin resistance follows — reframing the problem as one of storage, not just excess.

The practical takeaway is a shift in therapeutic thinking: targeting how and where the body stores fat may beat targeting inflammation or insulin signaling alone. The resistance comes from an establishment and drug pipeline oriented around inflammatory mechanisms.

We rate the evidence strong for its genre: it integrates rare-mutation case studies with large genetic datasets from a field leader, with conflicts transparently disclosed (the author consults for pharma, but the conclusions rest on independent genetics). Its clinical significance is high conceptually — it reshapes how to think about the metabolic roots of cardiovascular risk — even if it points toward future therapies more than present ones.