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.