A method for diagnosing a body weight condition or predisposition to a body weight condition in an animal by determining observed level(s) of at least one biomarker in a tissue or biofluid sample from the animal, and comparing the observed level(s) to reference level(s) for the biomarker; wherein the observed level(s) relative to the reference level(s) are individually or collectively indicative of the body weight condition or predisposition.
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