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Green Leafy Vegetables May Prevent Fatty Liver

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A larger portion of green leafy vegetables in the diet may reduce the risk of developing liver steatosis, or fatty liver. In a study published in PNAS researchers from Karolinska Institutet in Sweden show how a larger intake of inorganic nitrate, which occurs naturally in many types of vegetables, reduces accumulation of fat in the liver. There is currently no approved treatment for the disease, which can deteriorate into life-threatening conditions such as cirrhosis and liver cancer.

“When we supplemented with dietary nitrate to mice fed with a high-fat and sugar Western diet, we noticed a significantly lower proportion of fat in the liver,” says Mattias Carlström, Associate Professor at the Department of Physiology and Pharmacology, Karolinska Institutet.

Their results were confirmed by using two different cell culture studies in human liver cells. Apart from a lower risk of steatosis, the researchers also observed reduction of blood pressure and improved insulin/glucose homeostasis in mice with type 2 diabetes.

The research group’s focus is the prevention of cardiovascular diseases and type 2 diabetes through dietary changes and by other means. Previous studies have shown that dietary nitrate from vegetables enhances the efficiency of the mitochondria, the cell’s power-plant, which can improve physical endurance. It has also been shown that a higher intake of fruit and vegetables has a beneficial effect on cardiovascular function and on diabetes.

“We think that these diseases are connected by similar mechanisms, where oxidative stress causes compromised nitric oxide signaling, which has a detrimental impact on cardiometabolic functions,” says Dr. Carlström. “We now demonstrate an alternative way to produce nitric oxide, where more nitrate in our diet can be converted to nitric oxide and other bioactive nitrogen species in our body.”

Even though many clinical studies have been done, there is still considerable debate about what properties of vegetable make them healthy.

“It doesn’t take huge amounts to obtain the protective effects we have observed—only about 200 grams per day,” says Dr. Carlström.” Unfortunately, however, many people choose not to eat enough vegetables these days.”

Sources:

Isabel Cordero-Herrera el al., “AMP-activated protein kinase activation and NADPH oxidase inhibition by inorganic nitrate and nitrite prevent liver steatosis,” PNAS (2018). www.pnas.org/cgi/doi/10.1073/pnas.1809406115

https://medicalxpress.com/news/2018-12-green-leafy-vegetables-liver-steatosis.html

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