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Published on: 11/18/2024

What Foods Are Bad for the Liver?

A diet high in sugar (especially fructose), saturated and trans fats, refined carbohydrates, and excessive alcohol is harmful to the liver.

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Explanation

Fructose and Sugar

Fructose, a type of sugar found in many processed foods and sugary drinks (like soda and juice), is metabolized differently than glucose. The liver preferentially converts fructose into fat, contributing to hepatic steatosis (fatty liver). This can lead to inflammation and further liver damage. Limiting added sugars, particularly fructose in the form of high-fructose corn syrup, is crucial for liver health.

Unhealthy Fats

Saturated and trans fats, commonly found in fried foods, processed snacks, and some baked goods, exacerbate inflammation and insulin resistance, both of which are key drivers of NAFLD. These fats can impair liver function and contribute to the buildup of fat in the liver. Choosing healthier fats, like those found in olive oil, avocados, and nuts, is recommended.

Refined Carbohydrates

Refined carbohydrates, such as white bread, white rice, and sugary cereals, are quickly digested and cause rapid spikes in blood sugar. This triggers the release of insulin, which can, over time, lead to insulin resistance and further contribute to fat accumulation in the liver. Opting for whole grains, which are rich in fiber and digest more slowly, helps regulate blood sugar and supports liver health.

Alcohol

Excessive alcohol consumption is a well-established cause of liver damage, ranging from fatty liver to cirrhosis. Alcohol is directly toxic to liver cells and can lead to severe inflammation and scarring. Limiting alcohol intake or abstaining altogether is essential for maintaining a healthy liver.

The Importance of a Healthy Dietary Pattern

Research highlights the benefits of a balanced dietary pattern, such as the Mediterranean diet, for liver health. This diet emphasizes whole, unprocessed foods, including fruits, vegetables, whole grains, lean protein, and healthy fats. It is naturally lower in the harmful components mentioned above and provides essential nutrients that support liver function.

(References)

  • Berná G, Romero-Gomez M. The role of nutrition in non-alcoholic fatty liver disease: Pathophysiology and management. Liver Int. 2020 Feb;40 Suppl 1:102-108. doi: 10.1111/liv.14360. PMID: 32077594.

  • Salehi-Sahlabadi A, Sadat S, Beigrezaei S, Pourmasomi M, Feizi A, Ghiasvand R, Hadi A, Clark CCT, Miraghajani M. Dietary patterns and risk of non-alcoholic fatty liver disease. BMC Gastroenterol. 2021 Jan 28;21(1):41. doi: 10.1186/s12876-021-01612-z. PMID: 33509112; PMCID: PMC7844966.

  • Zelber-Sagi S, Salomone F, Mlynarsky L. The Mediterranean dietary pattern as the diet of choice for non-alcoholic fatty liver disease: Evidence and plausible mechanisms. Liver Int. 2017 Jul;37(7):936-949. doi: 10.1111/liv.13435. Epub 2017 Jun 1. PMID: 28371239.

  • Montemayor S, García S, Monserrat-Mesquida M, Tur JA, Bouzas C. Dietary Patterns, Foods, and Nutrients to Ameliorate Non-Alcoholic Fatty Liver Disease: A Scoping Review. Nutrients. 2023 Sep 14;15(18):3987. doi: 10.3390/nu15183987. PMID: 37764771; PMCID: PMC10534915.

  • Shah ND, Barritt AS 4th. Nutrition as Therapy in Liver Disease. Clin Ther. 2022 May;44(5):682-696. doi: 10.1016/j.clinthera.2022.04.012. Epub 2022 May 25. PMID: 35643886.

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Dr. Kenji Taylor

Family Medicine, Primary Care Roots Community Health Center, Hippo Education, Kameda Medical Center

Kenji Taylor, MD

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