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Our study with animal models was designed to test the hypothesis that green tea protects against chronic (over 4 weeks) alcohol induced liver injury in rats. The research was conducted on Wistar male rats divided into 4 research groups: I — received the Libera-De Carli control diet (L-DC), II — received (L-DC) and green tea, III — received (L-DC) and ethanol and IV — received (L-DC), green tea and ethanol. When comparing groups I and II we saw less intensive steatosis in group II than in group I, which can suggest that green tea may affect the accumulation of fat in the hepatocytes and protect them against steatosis and disruption. In III, the ethanol group, the steatosis of the liver increased considerably and the green tea which was given with ethanol in group IV did not halt this, as in group IV we also observed intensive steatosis in the liver. From this data we conclude that green tea has an important, although not fully understood role in preventing liver injury.
Significantly decreased amounts of carbohydrates and increase of fat in diet (Atkins’ diet, Jan Kwaœniewski’s diet) may interfere with liver metabolism because main source of liver energy are carbohydrates. Large amount of fatty acid in diet may induce overproduction of reactive oxygen species in mitochondria because of increased oxidation and may cause steatosis. The influence of high-fat, low-carbohydrate diet (contained 14 g% protein, 25 g% fat, 8 g% carbohydrate) and compared to usual habitual diet (13 g% protein, 3 g% fat, 28 g% carbohydrate) as a control on liver function was examined in adult male rabbits. Fodder and water was ad libitum. The experiment lasted 24 weeks. At the beginning and every six weeks rabbits were weighed and blood was taken. Plasma glucose and cholesterol concentration, activity of glutamate dehydrogenase, alanine and aspartate in plasma and liver did not change. Concentrations of triacylglycerols (TG) in plasma were lower in the study group. Activity of aldolase increased in plasma and in liver in the study group while activity of sorbite dehydrogenase decreased in plasma at the end of the experiment. Malondialdehyde (MDA) concentration increased in aorta with no changes in liver and erythrocytes. Activity of glutathione peroxidase increased in erythrocytes and liver while total SOD increased only in the liver. High-fat, low-carbohydrate diet despite the lack of growth of the body mass, modifies significantly the homeostasis of carbohydrates and antioxidants in liver and enhanced production of TG in this organ, resulting in its steatosis.
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Biological role of liver X receptors

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