Robert Lustig on Added Sugar: warns against

Dr. Robert Lustig warns against added sugar as a dose-dependent metabolic toxin. His central claim is that sugar is dangerous not because of its calories but “because it’s sugar” — “when consumed in excess, it’s a toxin. And it’s addictive.” These are Lustig’s stated positions, contested in the scientific literature, not established facts.

His stated reasoning is that fructose-containing sugars damage the liver’s metabolic machinery, driving insulin resistance and chronic disease independently of calorie intake. He argues this is why limiting added sugar is one of the few elements of the 2026 USDA Dietary Guidelines he endorses.

This page chronicles a stated position of the person above. It is not medical advice and not the site's own conclusion.