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Heart disease and single-vitamin supplementation
1Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA. maret.traber@oregonstate.edu
Insights
Adequate vitamin E intake is crucial for heart health, but clinical trials often overlook specific functional needs and optimal measurement methods. More research is needed to define adequate vitamin E for various functions.
Area of Science:
- Cardiovascular Science
- Nutritional Biochemistry
Background:
- Heart disease is a leading cause of death, influenced by multifactorial elements including inflammation and oxidative stress in atherogenesis.
- Vitamin E, possessing antioxidant and anti-inflammatory properties, is a key focus in cardiovascular research.
- Current clinical trials have shown optimism regarding vitamin E's potential, but often underestimate the impact of lifestyle and pharmaceutical interventions.
Purpose of the Study:
- To review the role of vitamin E in preventing heart disease, considering its antioxidant and anti-inflammatory functions.
- To evaluate the efficacy of vitamin E in clinical trials, highlighting limitations and areas for improvement.
- To emphasize the need for defining adequate vitamin E intake for specific physiological functions.
Main Methods:
- Review of existing clinical trial data on vitamin E and heart disease.
- Analysis of vitamin E's biochemical mechanisms, including its interaction with oxidative stress and vitamin C.
- Discussion of the shortcomings in trial methodologies, such as the lack of biomarker and oxidative stress measurements.
Main Results:
- Vitamin E can reduce lipid peroxidation biomarkers but requires adequate vitamin C for optimal function.
- Many Americans do not meet recommended dietary intakes for vitamin E.
- Clinical trials have been overly optimistic, failing to account for lifestyle factors and pharmaceutical treatments.
Conclusions:
- While adequate vitamin E intake is necessary, specific requirements for various functions remain undefined.
- Future research should incorporate detailed biomarker analysis, including oxidative stress and plasma vitamin E levels.
- Optimizing vitamin E status is important, but it cannot solely compensate for poor diet and sedentary lifestyles.
Abstract:
Heart disease is the number one cause of death in the United States and has long been recognized to be multifactorial. A growing body of evidence suggests that not only free radical-mediated reactions but also inflammatory responses play major roles in atherogenesis. Vitamin E has both antioxidant and antiinflammatory properties and is the most widely studied vitamin in clinical trials and thus will be the primary example used in this review. Clinical trials of vitamin E efficacy, in hindsight, have been overly optimistic in their expectation that a vitamin could reverse poor dietary habits and a sedentary lifestyle as well as provide benefit beyond that of pharmaceutical agents in treating heart disease. However, it is also apparent that most Americans do not consume dietary amounts adequate to meet established vitamin E requirements. In response to oxidative stressors, vitamin E can decrease biomarkers of lipid peroxidation, is itself killed, and requires optimal vitamin C status to function most effectively. Thus, adequate vitamin E intakes are clearly needed, but what is adequate for what function has yet to be defined. It is noteworthy that in most trials, biomarkers were not used nor were oxidative stress and lipid peroxidation markers used or plasma vitamin E concentrations measured.
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