The Energy Balance Podcast EB. 84: Fructose and Uric Acid: Are David Perlmutter and Rick Johnson Wrong? (Part 1)
Jun 23, 2022
David Perlmutter, a leading neurologist and author, and Rick Johnson, a physician and researcher, dive into the controversial topics of fructose and uric acid. They debate whether these substances truly drive poor metabolic health or if their roles are misunderstood. Fructose, they argue, can be protective in the liver, increasing ATP availability rather than depleting it. The discussion challenges common myths about sugar, emphasizing the need for context when considering its effects on metabolism and health.
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Fructose Protects Hypoxic Liver Cells
- In hypoxia-induced hepatocyte injury models, fructose and glycolytic metabolites prevented cytotoxicity and restored NADH/NAD ratios and ATP.
- This shows fructose can be protective during impaired respiration rather than causative of ATP loss.
How Fructose Can Lead To Uric Acid Production
- Pathway: rapid ATP → ADP → AMP → inosine → hypoxanthine → xanthine → uric acid, catalyzed by xanthine oxidase/dehydrogenase.
- Excessive flux into this purine pathway requires severe ATP loss; normal fructose intake usually doesn't trigger it.
Human Trials Only Raise Uric Acid With Extreme Overfeeding
- A meta-analysis found isocaloric replacement of other carbs with fructose did not raise serum uric acid.
- Only hypercaloric fructose overfeeding (~213–219 g/day, 35% excess energy) raised uric acid in short trials.