Nutrient deficiency linked to heart disease risk for millions, new study warns

That's according to an analysis published in Nutrition Research Reviews, in which researchers from the University of East Anglia, the University of Southampton and Holland & Barrett analyzed omega-3 intake patterns across multiple countries and age groups.

The review found that 76% of people worldwide are not meeting the recommended levels of two omega-3 fats that are essential for heart health: eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA).

The analysis considered recommendations from global health authorities and assessed how closely populations follow them.

To explore the health implications of low omega-3 intake, Fox News Digital spoke with Michelle Routhenstein, a New York-based preventive cardiology dietitian at Entirely Nourished.

Low intake can also increase the risk of heart attacks and sudden cardiac death, she added. It's also associated with higher triglycerides, irregular heart rhythms and plaque in the arteries.

To improve omega-3 levels, the expert said it's important to understand how much is needed and where to get it.

For those taking omega-3 supplements, dosing should be based on lab results, medications, omega-3 levels and overall medical history, according to Routhenstein. Moderate, quality-controlled supplements are generally considered safe for most people.

"High-dose EPA, such as 4 grams per day of icosapent ethyl, has been shown to reduce major cardiovascular events in certain high-risk populations, while similar doses of mixed EPA/DHA have not consistently shown the same benefit," Routhenstein said.

Testing omega-3 levels can also help determine whether intake is adequate. The omega-3 index, a blood test that measures EPA and DHA in red blood cells, is considered one of the most reliable ways to assess status.

"Levels around 8% are associated with lower cardiovascular risk, while levels below approximately 4% are considered low," Routhenstein said.

Those who are unsure about their omega-3 status or whether supplementation is appropriate should speak with a healthcare provider to determine the best approach.