Eating too many carbs and calories — especially from sugary or processed foods — is what mainly causes fatty liver, not eating fat. Cutting out carbs or going on a carnivore diet might help reverse it.
Evidence from Studies
Supporting (2)
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An Integrated Understanding of the Rapid Metabolic Benefits of a Carbohydrate-Restricted Diet on Hepatic Steatosis in Humans.
The study shows that cutting carbs quickly reduces fat in the liver, which supports the idea that too many carbs, not fats, are a main cause of fatty liver.
Effect of a ketogenic diet on hepatic steatosis and hepatic mitochondrial metabolism in nonalcoholic fatty liver disease
The study shows that a low-carb ketogenic diet quickly reduces fat in the liver, even when people eat more fat, because the body burns fat for fuel instead of storing it. This supports the idea that carbs, not fat, are the main cause of fatty liver.
Contradicting (2)
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Dietary fat stimulates development of NAFLD more potently than dietary fructose in Sprague–Dawley rats
The study found that eating lots of fat caused more liver fat and damage in rats than eating lots of sugar, which goes against the idea that carbs are the main cause of fatty liver.
A low-carbohydrate diet induces hepatic insulin resistance and metabolic associated fatty liver disease in mice
The study found that a very low-carb diet actually caused fatty liver and liver damage in mice, which goes against the idea that such diets heal fatty liver.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.