Protective effects of dietary restriction and physical exercise on intrahepatic fat accumulation

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  • Kurosaka Yuka
    Exercise Physiology Laboratory, Wayo Women's University Division of Physical Fitness, Department of Molecular Physiology, Jikei University School of Medicine
  • Yamauchi Hideki
    Division of Physical Fitness, Department of Molecular Physiology, Jikei University School of Medicine
  • Takemori Shigeru
    Division of Physical Fitness, Department of Molecular Physiology, Jikei University School of Medicine Department of Molecular Physiology, Jikei University School of Medicine
  • Minato Kumiko
    Exercise Physiology Laboratory, Wayo Women's University

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Abstract

<p>This paper discusses the effects of dietary restriction and physical exercise on the maintenance of good health, focusing on intrahepatic fat accumulation, a type of ectopic fat accumulation. Excessive intrahepatic fat accumulation eventually progresses to fatty liver, which may evolve into liver cirrhosis and liver cancer. Physical exercise and dietary restriction are generally accepted as the major non-pharmacological remedies against intrahepatic fat accumulation. However, a combination of diet and physical activity has not necessarily shown expected synergistic or additive effects. In fact, dietary conditions antagonistically blocked the effect of physical activity on fatty liver, and physical inactivity adversely exacerbated the effect of dietary restriction on intrahepatic fat accumulation. These diverse combination effects, as well as etiology-dependent diversity in the activation of cellular signaling pathways leading to fatty liver, suggest the need to optimize remedies for the efficient amelioration and prevention of intrahepatic fat accumulation in a case-dependent manner. As a tentative step to constructing a prescription formula for optimal remedies, the probable advantage of physical exercise over dietary restriction at preventing fat spillover from adipose tissue to liver is noted.</p>

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