Medium-Chain Triglycerides Block Ghrelin's Hunger Signal in Mice
A diet rich in medium-chain triglycerides (MCTs) raised ghrelin levels 2.5-fold in mice but paradoxically blocked ghrelin's appetite-stimulating effect, suggesting MCTs interfere with ghrelin signaling upstream of the hunger pathway.
Quick Facts
What This Study Found
MCT diet feeding raised plasma ghrelin 2.5-fold but completely blocked ghrelin-induced food intake and hypothalamic NPY upregulation, while leaving ghrelin-induced growth hormone secretion intact.
Key Numbers
No specific numerical outcomes detailed in abstract; study measured food intake and body weight changes in MCT-fed versus control mice.
How They Did This
Mouse study comparing MCT vs LCT diets over 5 days, using wild-type mice, ghrelin transgenic mice, and ghrelin/GOAT double transgenic mice. Measured plasma ghrelin, food intake, body weight, hypothalamic NPY expression, and growth hormone secretion.
Why This Research Matters
Understanding how dietary fats modulate ghrelin signaling could lead to dietary strategies that naturally suppress hunger without blocking ghrelin's beneficial growth hormone effects — a more targeted approach than blanket ghrelin-blocking drugs.
The Bigger Picture
Ghrelin has been a challenging drug target because blocking it affects both appetite and growth hormone pathways. This study reveals that MCTs can selectively disable ghrelin's hunger signal while preserving its growth hormone function — a natural selectivity that pharmaceuticals have struggled to achieve.
What This Study Doesn't Tell Us
This is a mouse study and may not directly translate to humans. The 5-day MCT feeding period is short, and long-term effects are unknown. The mechanism by which MCTs block ghrelin's orexigenic signaling upstream of NPY remains unclear. MCT doses used may not reflect typical human dietary intake.
Questions This Raises
- ?Do MCTs have a similar ghrelin-blocking appetite effect in humans?
- ?What is the specific molecular mechanism by which MCTs interfere with ghrelin signaling upstream of NPY?
- ?Could MCT supplementation enhance the effectiveness of GLP-1-based weight loss therapies?
Trust & Context
- Key Stat:
- 2.5× ghrelin, 0 appetite MCT diet raised ghrelin levels 2.5-fold but completely blocked its ability to stimulate food intake, revealing a dietary disconnect between ghrelin levels and hunger.
- Evidence Grade:
- This is a well-designed animal study using multiple mouse models (wild-type, transgenic, double transgenic) with clear controls. However, as a mouse study it is preliminary evidence for human applicability.
- Study Age:
- Published in 2025, representing current research on the interplay between dietary lipids and peptide hormone signaling.
- Original Title:
- Dietary medium chain triglycerides impairs orexigenic action of ghrelin in mice.
- Published In:
- Frontiers in endocrinology, 16, 1690761 (2025)
- Authors:
- Aotani, Daisuke, Ariyasu, Hiroyuki, Tanaka, Tomohiro, Shimazu-Kuwahara, Satoko, Nomura, Hidenari, Shimizu, Yoshiyuki, Takeda, Katsushi, Koyama, Hiroyuki, Kusakabe, Toru, Miyazawa, Takashi, Hikida, Takatoshi, Kataoka, Hiromi, Nakao, Kazuwa
- Database ID:
- RPEP-09957
Evidence Hierarchy
Frequently Asked Questions
Does MCT oil suppress appetite by blocking ghrelin?
This mouse study found that MCTs paradoxically raised ghrelin levels but blocked ghrelin's hunger signal in the brain. If this translates to humans, it would mean MCT oil doesn't lower ghrelin — it makes the body ignore ghrelin's appetite drive. Human studies are needed to confirm this.
Is this why coconut oil is linked to appetite control?
Possibly. Coconut oil is rich in MCTs, and this study provides a potential mechanism — MCTs may disrupt ghrelin's ability to activate hunger pathways in the hypothalamus. However, the connection between this mouse finding and anecdotal human appetite effects remains unproven.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-09957APA
Aotani, Daisuke; Ariyasu, Hiroyuki; Tanaka, Tomohiro; Shimazu-Kuwahara, Satoko; Nomura, Hidenari; Shimizu, Yoshiyuki; Takeda, Katsushi; Koyama, Hiroyuki; Kusakabe, Toru; Miyazawa, Takashi; Hikida, Takatoshi; Kataoka, Hiromi; Nakao, Kazuwa. (2025). Dietary medium chain triglycerides impairs orexigenic action of ghrelin in mice.. Frontiers in endocrinology, 16, 1690761. https://doi.org/10.3389/fendo.2025.1690761
MLA
Aotani, Daisuke, et al. "Dietary medium chain triglycerides impairs orexigenic action of ghrelin in mice.." Frontiers in endocrinology, 2025. https://doi.org/10.3389/fendo.2025.1690761
RethinkPeptides
RethinkPeptides Research Database. "Dietary medium chain triglycerides impairs orexigenic action..." RPEP-09957. Retrieved from https://rethinkpeptides.com/research/aotani-2025-dietary-medium-chain-triglycerides
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.