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Linoleic acid and coronary heart disease
1Sanford Research/USD, 1100 East 21st Street, Suite 700, Sioux Falls, SD 57105, USA. harrisw@sanfordhealth.org
Prostaglandins, Leukotrienes, and Essential Fatty Acids
|October 28, 2008
Summary
Higher linoleic acid (LA) intake, especially when replacing saturated fats, is linked to reduced coronary heart disease (CHD) risk. Current dietary recommendations for LA are supported by strong scientific evidence.
Area of Science:
- Nutrition Science
- Cardiovascular Health
Background:
- Linoleic acid (LA) is an essential omega-6 fatty acid.
- Its role in coronary heart disease (CHD) risk is debated.
- Dietary fat composition significantly impacts cardiovascular health.
Purpose of the Study:
- To evaluate the association between linoleic acid (LA) intake and coronary heart disease (CHD) risk.
- To review diverse study types, including human experimental and observational data.
- To assess the evidence supporting current dietary recommendations for LA.
Main Methods:
- Systematic review of experimental and observational studies.
- Analysis of pooled data from randomized controlled trials (RCTs).
- Examination of dietary intake and serum levels of LA in relation to CHD risk.
Main Results:
- Experimental studies show LA lowers low-density lipoprotein cholesterol (LDL-C), particularly when replacing saturated fatty acids.
- Observational studies consistently associate higher LA intake or serum levels with reduced CHD risk.
- Pooled RCT data indicate a significant CHD event reduction with LA intake 2-3 times current levels.
Conclusions:
- Current dietary recommendations for linoleic acid (LA) intake (5-10% of energy) are evidence-based.
- Increasing LA intake, especially by substituting saturated fats, appears beneficial for reducing CHD risk.
- Dietary guidelines for LA should be maintained.
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