Peter Liu, PhD

Peter Liu, MD, PhD

Investigator, The Lundquist Institute
Professor of Medicine, David Geffen School of Medicine at UCLA


Understands the mechanisms by which disordered sleep leads to ill-health, and to develop methods to prevent these ill-effects from occurring without requiring more sleep

Research Description

Dr. Liu’s research focuses on how sleep and hormones influence metabolic and reproductive health throughout life. This work includes understanding how circadian misalignment (as occurs with shiftwork or jet lag) or insufficient sleep (as occurs with the 24/7 lifestyle) causes obesity, insulin resistance and diabetes mellitus. The hope is that understanding the mechanisms by which this occurs could lead to novel methods to prevent the ill-effects of poor quality, insufficient or misaligned sleep on metabolic health without requiring modification of sleep.

In addition, he is researching the effects of how age modifies the effects of sleep on obesity, insulin resistance and diabetes mellitus. For example, are older adults more or less prone to experience the adverse metabolic effects of sleep restriction. Finally, he is a board certified endocrinologist who holds a FDA IND and and has experience in drug development from phase I studies to phase III studies that follow GCP guidelines.
Theme Groups


  • MD, 1993, University of Sydney, Australia
  • PhD, 2003, University of Sydney, Australia

Recent and/or Significant Publications

Piotrowska K, Wang C, Swerdloff RS, Liu PY. Male hormonal contraception: hope and promise. Lancet Diabetes Endocrinol. 2017;5(3):214–223. doi:10.1016/S2213-8587(16)00034-6
Killick R, Hoyos CM, Melehan KL, Dungan GC 2nd, Poh J, Liu PY. Metabolic and hormonal effects of 'catch-up' sleep in men with chronic, repetitive, lifestyle-driven sleep restriction. Clin Endocrinol (Oxf). 2015;83(4):498–507. doi:10.1111/cen.12747
Piotrowska K, Wang C, Swerdloff RS, Liu PY. Male hormonal contraception: hope and promise. Lancet Diabetes Endocrinol. 2016;5(3):214-223.
Liu PY, Takahashi PY, Yang RJ, Iranmanesh A, Veldhuis JD. Age and time-of-day differences in the hypothalamo-pituitary-testicular, and adrenal, response to total overnight sleep deprivation. Sleep. 2020 Jan 29. pii: zsaa008. doi: 10.1093/sleep/zsaa008.
Zhang W, Piotrowska K, Chavoshan B, Wallace J, Liu PY. Sleep Duration Is Associated With Testis Size in Healthy Young Men. J Clin Sleep Med. 2018;14(10):1757–1764. Published 2018 Oct 15. doi:10.5664/jcsm.7390


Peter Liu MD PhD Discusses Sleep