A new review published in Nutrition Research Reviews has identified significant inconsistencies and gaps in global recommendations for omega-3 fatty acids, specifically docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA). The analysis found that despite the recognized health benefits of these nutrients, many populations are not meeting recommended intake levels.
The study evaluated 42 technical and scientific documents (TSDs) from various countries and international bodies. Most TSDs provided quantitative guidelines for omega-3 intake but differed widely in their recommendations. The guidelines covered a range of age groups and life stages, with some focused on infants, children, adolescents, adults, pregnant or lactating individuals, and older adults.
For infants up to six months old, one guideline suggested DHA should make up 0.32% of total fatty acid intake. Korean authorities recommended an adequate intake of 200 mg/day of DHA for infants under five months. For young children aged 1–3 years, the recommended intake ranged from 40 mg/day to 250 mg/day of combined EPA, DHA, and DPA. Recommendations for older children aged 4–12 years varied from 55 mg/day to 500 mg/day.
Adolescents also faced a wide range of recommendations: Australian and New Zealand guidelines advised as little as 70 mg/day at age thirteen, while South African and French guidelines suggested up to 500 mg/day through age eighteen. For adults over eighteen years old, several TSDs—three of them international—recommended a daily intake of 250 mg of combined DHA and EPA.
Pregnant individuals were generally advised to increase their omega-3 intake by an additional 100–200 mg/day of DHA or reach a total daily amount between 110–500 mg depending on the country. Some guidelines recommended intakes up to one gram per day during pregnancy if blood levels were low to reduce the risk of preterm birth.
Upper limits also varied: for infants under six months old, no upper limit was set in some regions; for other children’s age groups the cap was three grams per day; for adults over eighteen years old it ranged from two to five grams per day.
Most documents included health messages about chronic disease prevention and highlighted links between LC n-3PUFA consumption and outcomes like cognitive development in early life or reduced risks related to depression or cardiovascular health. However, much supporting evidence remains observational rather than causal.
Researchers concluded that food alone may not be enough to meet these targets in many populations. They suggest supplementation could be necessary in some contexts along with efforts to develop sustainable alternative sources of EPA and DHA because current average intakes remain below recommendations worldwide.
