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<p>Although medium-chain triglycerides (MCT) stimulate and carbohydrates inhibit ketone body synthesis, their quantitative interaction in humans is not well defined. This randomised, controlled, double-blind crossover study investigated how increasing glucose doses affects C8-MCT-induced ketone body synthesis after overnight fasting. Eleven healthy young woman (22.5 ± 1.9 years) received a constant dose of tricaprylin (99% C8; 0.2&#xa0;g/kg bodyweight) combined with increasing glucose doses (0.2–0.6&#xa0;g/kg bodyweight). In additional interventions, both C8-MCT and glucose were increased in parallel. Plasma β-hydroxybutyrate (βHB), glucose, and insulin were measured for up to 300&#xa0;min post-dose. Indirect calorimetry in a subset and side effects were monitored. C8-MCT significantly increased βHB concentrations at low and medium glucose doses compared with control, but not at highest glucose dose. When both substrates were increased equally (1:1 ratio), ketone body synthesis increased. βHB was negative correlated with increasing glucose dosing at constant C8-MCT dosing, while parallel increases in both substrates showed a positive moderate correlation between βHB and C8-MCT doses. No dose-dependent side effects occurred. Overall, ketone body synthesis declines with rising glucose intake. It remains unclear whether a C8-MCT: glucose ratio of 1:3 represents a metabolic cut-off or whether glucose intake becomes excessive due to linear effects.</p><p><i>Trial registration</i> This study was prospectively registered in the German Clinical Trials Register (DRKS ID DRKS00035373 <a href="https://www.bfarm.de/EN/BfArM/Tasks/German-Clinical-Trials-Register/_node.html">https//www.bfarm.de/EN/BfArM/Tasks/GermanClinicalTrialsRegister/_node.html</a>).</p>

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Effect of glucose on medium chain triglyceride induced ketosis in healthy adults in a randomized, double-blind, controlled study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月9日

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  • Marius Frenser,
  • Manfred Fobker,
  • Renata Antonina Feuerborn,
  • Thorsten Marquardt,
  • Tobias Fischer

摘要

Although medium-chain triglycerides (MCT) stimulate and carbohydrates inhibit ketone body synthesis, their quantitative interaction in humans is not well defined. This randomised, controlled, double-blind crossover study investigated how increasing glucose doses affects C8-MCT-induced ketone body synthesis after overnight fasting. Eleven healthy young woman (22.5 ± 1.9 years) received a constant dose of tricaprylin (99% C8; 0.2 g/kg bodyweight) combined with increasing glucose doses (0.2–0.6 g/kg bodyweight). In additional interventions, both C8-MCT and glucose were increased in parallel. Plasma β-hydroxybutyrate (βHB), glucose, and insulin were measured for up to 300 min post-dose. Indirect calorimetry in a subset and side effects were monitored. C8-MCT significantly increased βHB concentrations at low and medium glucose doses compared with control, but not at highest glucose dose. When both substrates were increased equally (1:1 ratio), ketone body synthesis increased. βHB was negative correlated with increasing glucose dosing at constant C8-MCT dosing, while parallel increases in both substrates showed a positive moderate correlation between βHB and C8-MCT doses. No dose-dependent side effects occurred. Overall, ketone body synthesis declines with rising glucose intake. It remains unclear whether a C8-MCT: glucose ratio of 1:3 represents a metabolic cut-off or whether glucose intake becomes excessive due to linear effects.

Trial registration This study was prospectively registered in the German Clinical Trials Register (DRKS ID DRKS00035373 https//www.bfarm.de/EN/BfArM/Tasks/GermanClinicalTrialsRegister/_node.html).