I oversee the CMSC facility at NIDDK. Core facilities collaborate with clinicians and scientists from across NIDDK. This core provides clinical stable isotope mass spectrometry for clinical labs. The core measures total energy expenditure of participants in clinical studies. This is the total energy a person or animal uses in a day. This technique determines an individual’s diet and exercise needs. The core also measures other aspects of metabolism. Researchers use these techniques in obesity studies.