Higher levels of certain environmental chemicals, mono-benzyl phthalate and bisphenol A, in the urine of adolescents aged 12–19 are linked to higher indicators of fat accumulation in the liver and a...
Mechanism
Synthesis from 1 study
These chemicals trigger inflammation in the liver and mess with its hormones, causing it to store too much fat and burn less. When teens are inactive, their bodies are less able to fight this fat buildup, making the problem worse.
Most probable mechanism
When certain chemicals enter the body, they activate immune cells, causing low-grade inflammation in the liver. This inflammation disrupts how the liver manages fats, making it store more fat and break down less. At the same time, these chemicals interfere with hormones that control metabolism, which further increases fat buildup and reduces the liver’s ability to use energy properly. Over time, this leads to excess fat accumulating in the liver.
Phthalate and bisphenol metabolites enter the bloodstream and activate immune cells, increasing circulating white blood cell counts
Activated immune cells release inflammatory signals that promote hepatic inflammation and disrupt lipid metabolism pathways
Inflammatory signaling activates pathways that increase fat synthesis and inhibit fat breakdown in liver cells
Bisphenol compounds bind to hormone receptors in liver cells, altering gene expression to favor fat storage and impair mitochondrial energy production
Mitochondrial dysfunction increases oxidative stress and lipid peroxidation, further damaging liver cells and promoting fat accumulation
Chronic inflammation and lipid dysregulation lead to excessive fat deposition in the liver, resulting in steatosis and metabolic dysfunction
Less supported by current evidence, but not ruled out
When physical activity is low and sitting time is high, the body becomes less able to burn fat and control inflammation, making the liver more vulnerable to fat buildup caused by environmental chemicals.
Low physical activity and high sedentary time reduce the release of muscle-derived signals that help regulate metabolism and inflammation
Reduced metabolic flexibility leads to increased fat storage in the liver and diminished clearance of circulating lipids
Combined with chemical exposure, this environment enhances hepatic inflammation and lipid accumulation beyond what either factor causes alone
Evidence from Studies
Supporting (1)
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Contradicting (0)
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