Study compares olive and fish oil for intravenous nutrition

A systematic review published in the Journal of Human Nutrition and Dietetics has found limited direct evidence comparing olive-oil and fish-oil-based parenteral nutrition (PN) formulations. While hospitals are increasingly moving away from traditional soybean oil-based nutrition, researchers have yet to find clear evidence that one of these alternatives is superior for hospitalized adults.

Previous studies suggest that reducing soybean oil content may offer clinical benefits, and both olive and fish oil formulations are thought to influence immune, inflammatory, and liver-related outcomes. However, a review of six clinical trials showed no significant differences between the two approaches regarding major outcomes, such as the length of hospital stays.

Findings remain inconsistent across existing literature. Some research indicates fish oil-containing PN may lower infection risks following surgery, while other studies suggest it may not provide enough essential fatty acids for long-term use. Both formulations have been associated with reductions in total bilirubin concentrations over time. Further research is required to determine which lipid emulsion provides the greatest clinical benefit for patients unable to meet nutritional needs through oral or enteral routes.