Effects of medium chain triglycerides supplementation on insulin sensitivity and beta cell function: A feasibility...

Area of Science:

• Metabolic Health
• Nutritional Science
• Human Physiology

Background:

• Medium chain triglycerides (MCT) possess distinct metabolic properties that may positively influence insulin sensitivity and beta cell function.
• Existing human data on the metabolic effects of MCT supplementation is limited, necessitating further clinical investigation.

Purpose of the Study:

• To evaluate the impact of a 6-week medium chain triglycerides (MCT) oil supplementation on insulin sensitivity (Si) and beta cell function in non-diabetic adults.
• To assess changes in glucose and insulin metabolism parameters, including acute insulin response (AIR), disposition index (DI), and glucose effectiveness (Sg).

Main Methods:

• A 6-week clinical trial involving 22 non-diabetic subjects who received MCT oil supplementation as a partial replacement for dietary fat.
• Participants maintained stable body weight and physical activity; dietary intake, body composition, and resting energy expenditure (REE) were monitored.
• Insulin-modified frequently sampled intravenous glucose tolerance tests were conducted pre- and post-intervention to measure metabolic parameters.

Main Results:

• MCT supplementation was well-tolerated, with stable body weight, resting energy expenditure, and body composition throughout the study.
• No significant changes were observed in fasting glucose, insulin, insulin resistance, or key metabolic parameters like Si, AIR, DI, and Sg.
• A significant decrease in mean total adiponectin was noted, while individual responses in Si showed a wide range.

Conclusions:

• Six weeks of isocaloric MCT substitution for dietary fat resulted in a broad spectrum of individual metabolic responses, but no consistent significant improvements in overall glucose and insulin metabolism.
• The study's single-arm, non-randomized design limits definitive conclusions about MCT's efficacy.
• Further randomized controlled trials are required to ascertain the specific effects of MCT on human metabolic health.