Researchers used NHANES data to link protein amount and source, red and processed meat, and alcohol guidance changes in the 2025–2030 Dietary Guidelines for Americans to higher odds of steatotic liver disease and fibrosis; plant-based foods showed protective associations.
Higher total protein intake in NHANES analyses was associated with greater odds of steatotic liver disease and fibrosis, driven in part by red and processed meat consumption.
Greater intake of greens, beans, seafood or plant proteins, fruits, vegetables and whole grains was linked to lower odds of steatotic liver disease and fibrosis.
Clinicians should translate generalized protein recommendations into guidance about sources and quantity, and discuss alcohol limits with patients who have or are at risk for liver disease.
# What the analysis looked at
# Main findings High total protein intake was associated with higher prevalence of steatotic liver disease and fibrosis. When investigators separated protein by source, a clear hierarchy emerged in the data: plant-based protein showed the most favorable associations, followed by seafood, then poultry, with red meat associated with the worst liver outcomes. Red and processed meats, sodium, saturated fat and added sugars were each linked to greater prevalence of steatotic liver disease and fibrosis.
By contrast, higher consumption of greens, beans, seafood or plant-based proteins, total fruit, whole fruit, vegetables and whole grains was associated with lower odds of steatotic liver disease and fibrosis. Limited alcohol use was reported by the researchers to be strongly protective for all liver outcomes examined.
# Why this matters relative to the DGA-2025
# Practical takeaways for clinicians and patients
# What the authors recommend The researchers urged clearer, evidence-based public messaging on the type and amount of protein people should consume and on alcohol limits to minimize liver disease risk. They highlighted that generalized calls to increase protein intake can shift consumer behavior (for example, more protein-fortified snacks and red-meat consumption) in ways that may increase liver risk unless protein sources are specified.
# Bottom line NHANES-based analyses link higher total protein intake and higher red and processed meat intake with greater odds of steatotic liver disease and fibrosis, while plant-forward foods and limited alcohol use were associated with lower odds. The recent Dietary Guidelines emphasize total protein but removed specific guidance on protein sources and explicit alcohol limits, creating a gap between the guideline messaging and diet patterns associated with better liver outcomes in this dataset.
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