Postprandial serum endotoxin in healthy humans is modulated by dietary fat in a randomized, controlled, cross-over study.
Level 2 - randomized trial
Individual randomized crossover trial
PubMed 27816052 · doi:10.1186/s12944-016-0357-6
What was done
Twenty healthy young adults (mean age 25 ± 3.2 years) completed a single-blind, randomized, crossover study testing the acute effects of four isoenergetic meals on postprandial serum endotoxemia, metabolites, and inflammatory markers. Following an overnight fast, participants received one of four meals separated by at least one week: a 20% fat control meal (olive oil) or 35% fat meals enriched with omega-3 fatty acids (500 mg DHA from fish oil), omega-6 fatty acids (7.4 g grapeseed oil), or saturated fat (16 g coconut oil). Baseline and postprandial blood samples were drawn and evaluated via repeated-measures ANCOVA.
What was found
Postprandial serum endotoxin concentrations significantly increased after the saturated fat meal but decreased following the omega-3 meal (p < 0.05). The omega-6 meal did not differ from the control meal in its effect on postprandial endotoxin (p > 0.05). There were no significant meal-related differences in postprandial systemic biomarkers of inflammation. Triacylglycerols were significantly higher after the omega-6 meal than the omega-3 meal, and non-esterified fatty acids were significantly higher after the saturated fat meal compared to the other meals. The abstract reports p-values and directions but does not report exact numerical point estimates or confidence intervals.
Why it matters
This study demonstrates that the specific fatty acid composition of an acute meal directly modulates postprandial endotoxemia in healthy adults, though these transient endotoxin changes do not immediately alter systemic inflammatory markers.
Limits
Sample size was small (n = 20) and limited to young, healthy adults. Only acute single-meal responses were assessed. The study was single-blind and retrospectively registered, and the abstract omits exact point estimates and variance metrics for the measured outcomes.
Cited by
- supports Omega-3 fatty acids suppress the postprandial release of lipopolysaccharide and endotoxin into the bloodstream following a meal.