Fructose Metabolism and Disease Mechanisms: From Nutritional Excess to Obesity and Multiorgan Pathophysiology

Mar 31, 2026Frontiers in bioscience (Elite edition)

How Eating Too Much Fructose Links to Obesity and Diseases Affecting Multiple Organs

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Abstract

Excessive fructose consumption is a critical driver of obesity and metabolic dysfunction.

Fructose metabolism activates pathways that may promote fat storage and generate uric acid.
This process is associated with mitochondrial dysfunction and oxidative stress, disrupting energy balance.
Consequences of fructose overload include liver fat accumulation, pancreatic β-cell dysfunction, and kidney damage.
Fructose consumption may also lead to intestinal issues, cardiometabolic problems, and neurocognitive decline relevant to Alzheimer's disease.
Key mechanisms involve activation of specific enzymes and pathways that drive inflammation and resistance to metabolic signals.

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Excessive fructose consumption has emerged as a critical driver of obesity and metabolic dysfunction, with far-reaching implications for multiple organ systems. This review synthesizes current evidence on the biochemical and molecular pathways underlying fructose induced disease mechanisms, discussing how fructose metabolism activates the "survival switch", promotes fat storage, and generates uric acid, mitochondrial dysfunction, and oxidative stress, thereby disrupting energy homeostasis. Key organ-specific consequences are explored, including hepatic steatosis and progression to non-alcoholic fatty liver disease, pancreatic β-cell dysfunction, renal fibrosis, intestinal barrier disruption with microbial dysbiosis, cardiometabolic impairment, pulmonary inflammation, and neurocognitive decline with relevance to Alzheimer's disease. Moreover, mechanistic insights highlight the role of fructokinase C activation, adenosine triphosphate (ATP) depletion, leptin resistance, pro-inflammatory signaling (mechanistic target of rapamycin complex-1 (mTORC1), renin angiotensin system (RAS), Toll-like receptor 4 (TLR4)), and cross-talk between fructose metabolism and organ-specific pathophysiology. Animal and human studies consistently reinforce the central role of fructose overload in driving obesity and associated complications. Meanwhile, this review frames fructose not merely as a caloric contributor but as a metabolic disruptor, thereby underscoring the urgent need for public health interventions, dietary regulation, and mechanistic research to mitigate fructose-driven metabolic disease.

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Fructose Metabolism and Disease Mechanisms: From Nutritional Excess to Obesity and Multiorgan Pathophysiology

Abstract

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