Essential oil supplementation improves insulin sensitivity and modulates the plasma metabolome of hyperinsulinemic horses.

The research article investigates the impacts of essential oil supplementation on insulin sensitivity and the plasma metabolome in horses with insulin regulation issues. The study indicates that the intervention alters the plasma metabolome and enhances insulin sensitivity.

Objective of the Study

• The main objective of this research was to explore the effect of Essential Oil (EO) supplementation on insulin sensitivity and the plasma metabolome in horses that had issues with insulin regulation.

Methods

• The horses were prepared and allocated randomly to receive the treatment, which consisted of a daily oral dose of a plant based EO supplement or a carrier (CON).
• The horses’ diets were carefully managed, with consumption of grass hay, and being fed individually with a concentrate twice daily, ensuring that the nutrient requirements for mature horses were fulfilled.
• For a duration of six weeks before and after the treatment, the mares underwent a combined glucose-insulin tolerance test (CGIT) and an oral sugar test (OST) on separate days to evaluate their insulin response.
• Vital plasma samples were analyzed before and after the treatment, revealing changes in the global metabolome.

Results

• The treatment was not found to have a significant effect on the Area Under Curve (AUC) or glucose disposal during the CGIT, but the study did note a treatment and covariate interaction for insulin concentrations at the 75 minute mark and for positive phase time (PT). In horses with a more severe initial degree of insulin dysregulation, EO decreased both the insulin concentrations at 75 minutes and PT.
• The EO treatment reduced the insulin response to the OST in horses showing higher pre-treatment responses.
• In response to EO treatment, 702 metabolites were identified as being uniquely changed. Pathways and biomarkers highlighted changes in amino acid, linoleic acid, mesaconic acid, TCA-cyle intermediates and bile acid metabolism influenced by EO.

Conclusions

• The directional alterations in these pathways or biomarkers were found to be consistent with changes in insulin sensitivity observed in other models.
• The researchers concluded that the use of EO brought significant alterations to the plasma metabolome and increased insulin sensitivity in horses with insulin regulation problems.