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Robert Lustig

Paediatric endocrinologist, UCSF
DoctorWorld
Longevity
Last updated: 7 October 2026

At a glance

  • Robert Lustig is an American paediatric endocrinologist and professor emeritus of paediatrics at the University of California, San Francisco (UCSF), specialising in neuroendocrinology and childhood obesity.
  • He became world-famous with the lecture ‘Sugar: The Bitter Truth’ (2009), viewed millions of times on YouTube. In it he argues that fructose from added sugars burdens the liver and metabolism.
  • In a study of children with obesity (2016), several metabolic markers improved within nine days when added sugar was replaced by starch at equal calorie intake.
  • He wrote Fat Chance (2012), The Hacking of the American Mind (2017) and Metabolical (2021), and co-founded the Institute for Responsible Nutrition.
  • Some researchers think he overstates the specific role of fructose; his core message to limit added sugar and ultra-processed food is widely shared.
  • For longevity, his work matters because metabolic health is a foundation of healthy ageing.
  • Takeaway: start with soft drinks, juices and sweets; that is often the quickest way to cut added sugar.

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