This 2013 paper by Richard Johnson et al. proposes that fructose uniquely contributes to obesity and diabetes through its ability to generate uric acid during metabolism. Unlike glucose, fructose rapidly depletes cellular ATP, activating pathways that increase uric acid, mitochondrial oxidative stress, and fat synthesis—effects that can occur even without excess caloric intake. Experimental and clinical data suggest that high fructose or sucrose intake promotes fatty liver, insulin resistance, and metabolic syndrome, partly mediated by uric acid–induced inhibition of energy-regulating enzymes. The authors argue that these findings challenge the notion that “a calorie is just a calorie,” positioning uric acid metabolism as a potential therapeutic target in obesity and diabetes prevention.

Reducing intake of added sugars—particularly fructose-containing sweeteners like sucrose and high-fructose corn syrup—may help prevent metabolic disease by lowering uric acid–driven fat accumulation and improving insulin sensitivity.

https://pmc.ncbi.nlm.nih.gov/articles/PMC3781481/pdf/3307.pdf