Marginal vitamin C status is associated with reduced fat oxidation during submaximal

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    • Marginal vitamin C status is associated with reduced fat oxidation during submaximal

      Marginal vitamin C status is associated with reduced fat oxidation during submaximal exercise in young adults

      Carol S Johnston , Corinne Corte and Pamela D Swan
      Nutrition & Metabolism 2006, 3:35 doi:10.1186/1743-7075-3-35
      Published 31 August 2006



      Abstract (provisional)


      Background

      Vitamin C is a cofactor in the biosynthesis of carnitine, a molecule required for the oxidation of fatty acids. A reduction in the ability to oxidize fat may contribute to the reported inverse relationship between vitamin C status and adiposity. To examine this possibility, we conducted a preliminary trial to evaluate the impact of vitamin C status on fat oxidation during submaximal exercise.

      Methods

      Fat energy expenditure was determined in individuals with marginal (n=15) or adequate (n=7) vitamin C status during a submaximal, 60-minute treadmill test. Subsequently, eight of the subjects with marginal vitamin C status completed an 8-week double-blind, placebo-controlled, depletion-repletion trial with submaximal exercise testing.

      Results

      Individuals with marginal vitamin C status oxidized 25% less fat per kg body weight during the treadmill test as compared to individuals with adequate vitamin C status. Fat oxidation during exercise was inversely related to fatigue (r=-0.611, p=0.009). Vitamin C repletion of vitamin C depleted subjects (500 mg vitamin C/d) raised fat energy expenditure during exercise 4-fold as compared to depleted control subjects (p=0.011).

      Conclusion

      These preliminary results show that low vitamin C status is associated with reduced fat oxidation during submaximal exercise. Low vitamin C status may partially explain the inverse relationship between vitamin C status and adiposity and why some individuals are unsuccessful in their weight loss attempts.

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    • Re: Marginal vitamin C status is associated with reduced fat oxidation during submaxi

      Sherrie, thanks for posting this. :)

      Interesting that the reduced fat oxidation, due to low Vit. c status was related to fatigue.
      WOE: Dr. Richard Bernstein's VLC and no sweet fruits, and the 12 Steps of Archevore, per Dr. Kurt Harris' site.

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