PRIOR INGESTION OF A KETONE MONOESTER SUPPLEMENT REDUCES POSTPRANDIAL GLYCEMIC RESPONSES IN YOUNG HEALTHY WEIGHT INDIVIDUALS
The main objective of this study was to determine whether acute ingestion of a ketone monoester (KME) supplement impacted mixed meal tolerance test (MMTT) glucose area under the curve (AUC). Nineteen healthy young volunteers (10 males/9 females, 24.7 ± 4.9 years, BMI = 22.7 ± 2.4) participated in a double-blind, placebo-controlled crossover study. Following overnight fasting (≥10 h), participants consumed 0.45mL/kg of a KME supplement or taste-matched placebo followed by a MMTT 15 minutes later. Blood samples were collected every 15-30 minutes over 2.5 hours. KME supplementation acutely raised beta-hydroxybutyrate (β-OHB) AUC (590%, P < 0.0001, d = 2.4) and resulted in decreases in blood glucose AUC (-9.4%, P = 0.03, d = 0.56) and non-esterified fatty acid (NEFA) AUC (-27.3%, P = 0.023, d = 0.68) compared to placebo. No differences were found for plasma insulin AUC (P = 0.70) or gastric emptying estimated by co-ingested acetaminophen AUC (P = 0.96) between ketone and placebo. Overall, results indicate that KME supplementation attenuates postprandial glycemic and NEFA responses when taken 15 min prior to a mixed meal in young healthy individuals. Future studies are warranted to investigate whether KME supplementation may benefit individuals with impaired glycemic control. Novelty Bullets • Acute ketone monoester supplementation 15 min prior to a mixed meal decreased postprandial glucose and non-esterified fatty acid (NEFA) levels without significantly impacting postprandial insulin or estimates of gastric emptying. • Glucose and NEFA lowering effects of ketone monoester supplementation are apparently not mediated by changes in insulin release or gastric emptying.