Discrepancy between Knowledge and Perceptions of Dietary Omega-3 Fatty Acid Intake Compared with the Omega-3 Index

Area of Science:

• Nutritional Science
• Biomarkers
• Cardiovascular Health

Background:

• The relationship between perceived nutrient adequacy and objective nutritional status biomarkers is poorly understood.
• Omega-3 fatty acids (O3-FA) are crucial for health, particularly cardiovascular disease (CVD) prevention, but population status is often suboptimal.
• The omega-3 index (O3-I) is a validated biomarker for assessing long-term O3-FA status and CVD risk.

Purpose of the Study:

• To compare dietary practices, knowledge, and beliefs regarding O3-FA with the O3-I biomarker in U.S. and German adults.
• To investigate the association between perceived O3-FA adequacy and actual O3-I levels.
• To identify potential differences in O3-FA status and related perceptions between U.S. and German populations.

Main Methods:

• Cross-sectional study involving 200 U.S. and German adults aged 18-80 years.
• Assessment of dietary practices, knowledge, and beliefs concerning O3-FA.
• Measurement of erythrocyte omega-3 index (O3-I) as a biomarker of O3-FA status and CVD risk.

Main Results:

• Despite high awareness of O3-FA benefits and sources, 99% of participants had O3-I levels associated with intermediate or high CVD risk.
• Mean O3-I was lower in the U.S. (4.3%) compared to Germany (5.5%), with 40% of Americans in the high CVD-risk category versus 10% of Germans.
• Perceptions of dietary O3-FA adequacy did not correlate with measured O3-I levels; many believed their intake was sufficient despite suboptimal biomarker status.

Conclusions:

• A significant disconnect exists between public knowledge and belief regarding O3-FA and their actual nutritional status, as indicated by the O3-I.
• The majority of adults in both countries exhibit low O3-I levels, suggesting a widespread need for improved O3-FA intake for cardiovascular protection.
• Dietary perceptions of adequacy are unreliable indicators of O3-FA status, emphasizing the importance of objective biomarker assessment for public health initiatives.