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Effects of N-3 Fatty Acids on Hepatic Triglyceride Content in Humans
  1. Gloria Lena Vega, PhD*†‡∥¶,
  2. Manisha Chandalia, MD,
  3. Lidia S. Szczepaniak, PhD§,
  4. Scott M. Grundy, MD, PhD*†‡§∥
  1. From the *Center for Human Nutrition; †The Donald W. Reynolds Cardiovascular Research Center; ‡the Departments of Clinical Nutrition and §Internal Medicine of the University of Texas Southwestern Medical Center; ∥The Metabolic Unit at the Veterans Affairs Medical Center and ¶Internal Medicine, Dallas, TX.
  1. The study was supported by the D.W. Reynolds Foundation, Veterans Affairs Merit Review grant, Moss Heart Foundation and General Clinical Research grant #M01-RR00633.
  2. Reprints: Scott M. Grundy, MD, PhD and Gloria L. Vega, PhD, Center for Human Nutrition, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9052. E-mail: Scott.Grundy{at}utsouthwestern.edu; Gloria.Vega{at}utsouthwestern.edu.

Abstract

Background Because dietary N-3 fatty acids reduce plasma triglycerides, they may also decrease hepatic triglyceride content. If so, N-3 fatty acids might constitute a therapy for fatty liver.

Methods Twenty-two subjects were recruited into a study designed to test the effects of N-3 fatty acids on liver fat content. Seventeen completed the trial that had a sequential design of 4-week placebo followed by an 8-week treatment with 9 g/d of fish oil. Liver fat was measured during placebo and treatment by magnetic resonance spectroscopy. Compliance was assessed by capsule count at the end of each study phase and measurement of fatty acid composition in plasma triglyceride and phospholipid. Plasma lipoproteins and adiponectin were also measured.

Results Treatment with fish oils reduced significantly levels of plasma triglyceride by 46% (P <.03), very low-density lipoprotein + intermediate density lipoprotein cholesterol by 21% (P <.03), total apolipoprotein B by 15% (P <.03). In contrast to the changes in plasma triglycerides, hepatic triglyceride content was not significantly reduced by fish oil treatment.

Conclusions N-3 fatty acids at high doses lower plasma triglyceride levels, but there are no significant decreases in hepatic content of triglyceride for the group as a whole. Whereas the triglyceride lowering is uniform, the liver response is more variable.

Key Words
  • ectopic liver fat
  • N-3 fatty acids

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