Defective Hormone Tied To Obesity In Babies, University of Ulm Study

A small number of extremely obese people may be fat because their bodies produce a malfunctioning form of the appetite-controlling hormone leptin. That's the conclusion of a case study that appears in the Jan. 1 issue of the New England Journal of Medicine. The researchers base this new theory on a 2-year-old boy of Turkish descent with an insatiable appetite. He was chronically obese for much of his short life.

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