Prebiotic effects of commercial apple juice in high-fat diet fed rat.

Objectives: Apples are one of the most frequently consumed fruits and are effective in preventing lifestyle-related and other diseases. However, few studies have been conducted to evaluate health benefits of processed apple products such as juice. In this study, we analyzed the health benefits of consuming apple juice, focusing on changes in the gut microbiota, which plays an important role in maintaining human health.

Results: Rats were fed apple juice ad libitum, and the relative abundances of various gut microbiota in fecal samples were analyzed. In addition, rats treated apple juice were fed with a high-fat diet, and body weight, plasma triglyceride, glucose, and cholesterol levels were measured. The relative abundance of Clostridium cluster XIV did not change with the treatment of apple juice, but the relative abundance of Clostridium cluster IV was significantly decreased. In contrast, the relative abundances of Lactobacillus and Bifidobacterium, which provide benefits to the human body, were significantly increased by 3-fold and 10-fold, respectively, with apple juice consumption. When apple juice-treated rats were fed a high-fat diet, the increase in body weight, liver fat, and blood lipid parameters were all suppressed compared to high-fat alone group.

Conculusion: This study suggests that the consumption of apple juice changes the gut microbiota, exerts a prebiotic effect, and is effective in improving lifestyle-related diseases.