Diet soda does not appear to harm the liver in the same way as alcohol or certain medications. However, research suggests that drinking large amounts may still influence liver health through several indirect mechanisms, although the evidence remains mixed, reports Verywell Health.
Diet soda is not considered a direct cause of liver damage
Unlike alcohol, viral hepatitis, or certain toxic drugs, diet soda is not known to directly injure the liver. Any potential effects appear to be linked to changes in metabolism rather than direct toxicity.
High intake has been linked to fatty liver disease
Some studies have associated frequent consumption of sugar-free soft drinks with a higher likelihood of developing metabolic dysfunction-associated steatotic liver disease (MASLD).
Artificial sweeteners may play a role
Researchers believe sweeteners such as aspartame, sucralose, and saccharin could contribute to some of the biological changes linked to liver health.
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Changes in gut bacteria may affect the liver
Excessive intake of artificial sweeteners may alter the balance of gut bacteria. This can allow inflammatory substances to enter the bloodstream and eventually reach the liver.
Insulin function may become less effective
Artificial sweeteners may influence insulin release in some people. Over time, this has been linked to insulin resistance, although more research is needed.
Insulin resistance increases liver strain
As the body becomes less responsive to insulin, elevated blood sugar levels may encourage fat to build up in the liver.
Appetite may increase over time
Some researchers suggest that artificially sweetened drinks may leave the brain less satisfied, making some people more likely to consume additional calories.
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Eating habits could explain part of the risk
People who drink several diet sodas each day often consume more processed foods. These broader dietary habits may contribute to obesity, insulin resistance, and fatty liver disease rather than diet soda alone.
Research findings are not consistent
Scientists have not reached a clear conclusion about the relationship between artificial sweeteners and MASLD. Some people may be more susceptible than others.
Diet soda may still be preferable to regular soda
Regular soft drinks sweetened with high-fructose corn syrup place a greater burden on the liver because fructose is rapidly converted into fat. Diet soda does not have this effect.
Moderate consumption appears to pose little risk
Current evidence suggests that drinking one can of diet soda per day is associated with minimal risk to liver health. People with obesity, uncontrolled diabetes, or existing liver disease should discuss appropriate intake with their healthcare provider.
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More human research is needed
While several studies point to possible links between diet soda and liver health, researchers say further studies in people are needed to better understand the relationship.
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