Clinical vs Preclinical Obesity (2025 Commission)

What the result means

Step 1

Confirm excess adiposity: direct body fat measurement, OR one anthropometric criterion plus body mass index, OR two anthropometric criteria regardless of it.

The exception

Above a body mass index of 40, excess adiposity can pragmatically be assumed and no further confirmation is required.

Index alone is not a diagnosis

Below 40 a body mass index on its own confirms nothing. The Commission recommends it as a population-level surrogate for risk, not as an individual assessment.

The reverse miss

Two anthropometric criteria confirm obesity REGARDLESS of the index, so a normal index with a raised waist and waist-to-height ratio qualifies. An index-first screen never reaches that person.

Clinical obesity

Confirmed adiposity WITH signs or symptoms of reduced tissue or organ function due to it, or a substantial age-adjusted limitation of day-to-day activities.

Preclinical obesity

Confirmed adiposity with preserved organ function, and a generally increased risk of progressing.

Function, not size

A higher body mass index does not make obesity clinical. Nothing in the second step reads a number.

Cutoffs

The Commission specifies validated cutoffs appropriate to age, gender and ethnicity rather than publishing one set, so none are encoded here.