Adiponectin

Adiponectin is a hormone released by fat tissue, and it behaves in the opposite way to most things fat tissue produces: levels are higher in lean people and lower in people carrying more fat, particularly visceral fat.

Its effects are broadly protective. It improves insulin sensitivity in muscle and liver, promotes fat oxidation, and has anti-inflammatory and anti-atherogenic actions on blood vessels, which is why low levels track with insulin resistance, type 2 diabetes and cardiovascular risk.

That inverse relationship makes it an unusual marker. Most adipose signals rise as fat mass rises; adiponectin falls, and the fall is one of the mechanisms proposed to explain why excess visceral fat is metabolically harmful rather than merely present.

It rises with weight loss, with exercise training and with some diabetes medications, which is consistent with its role as a marker of metabolic improvement rather than an independent lever to pull.

It is not part of routine testing, and there is no established clinical use for measuring it in an individual. It appears mainly in research and occasionally in expensive private panels, where the result changes nothing you would not do anyway.

There is nothing to buy. Supplements claiming to raise adiponectin rely on cell or animal data, and the reliable ways to raise it are the ways to improve metabolic health generally.

In practice, treat it as an explanation rather than a target: it is part of why losing visceral fat and training regularly improve so many markers at once.