High fructose corn syrup dominated health headlines for years, then the conversation went quiet. Chris Mearns argues the research on fructose metabolism only got stronger, and that one enzyme called fructokinase may explain why cravings spike, why energy crashes an hour after eating, and why restrictive diets stop working around week three.

Chris Mearns, founder of LIV3 Health and creator of the Fructose Model, walks Dr. Jeremy Koenig through the mechanism: metabolizing fructose depletes cellular ATP along the path to uric acid, which drives mitochondrial fission and a low-energy, inflammatory state the brain reads as scarcity. He explains why diet alone often fails, since the body also makes fructose endogenously through the polyol pathway in response to high glycemic carbs, salt, alcohol, dehydration, and sleep apnea. The conversation covers why GLP-1 drugs blunt cravings without restoring energy, why people with essential fructosuria who lack fructokinase entirely appear largely protected from metabolic dysfunction, and a four-week approach that pairs sugar reduction with compensatory slow carbs and MCT oil while taste preferences recalibrate. Mearns is also direct about the limits of his own case for luteolin as a fructokinase inhibitor, which has been studied in liver cells and rodent models but not in living humans, leaving the question of whether this enzyme is the central lever in metabolic disease still open.

Chris Mearns is the founder of LIV3 Health and the creator of the Fructose Model, a systems-based framework connecting fructose metabolism to cellular energy and chronic metabolic dysfunction. Website: https://liv3health.com | LinkedIn: linkedin.com/in/chrismearns

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