Protein Digestion Produces Peptides That Trigger Fullness Through Both CCK and Opioid Receptors
Dietary peptides from protein digestion induced satiety in rats through both CCK-A receptors and peripheral opioid receptors, with different proteins generating different satiety signal combinations.
Quick Facts
What This Study Found
Dietary peptides from protein digestion induced satiety through both CCK-A and peripheral opioid receptor pathways, with the relative contribution of each pathway varying by protein source — different foods activate different satiety signals.
Key Numbers
How They Did This
Animal feeding study in rats. Dietary protein digests from different sources administered. Food intake measured with and without CCK-A receptor antagonist (devazepide) and peripheral opioid antagonist (naloxone methiodide).
Why This Research Matters
Understanding which satiety signals different proteins activate could guide dietary recommendations for weight management — choosing protein sources that maximize satiety through multiple pathways.
The Bigger Picture
Diet isn't just about calories — the specific peptides released during digestion actively communicate with the brain through multiple satiety pathways. Optimizing dietary protein sources for maximal satiety signaling is a science-based weight management strategy.
What This Study Doesn't Tell Us
Rat feeding study. Protein digestion in vitro may differ from in vivo. The specific peptide fragments responsible for each pathway were not identified.
Questions This Raises
- ?Which protein sources produce the strongest combined satiety signals?
- ?Can specific bioactive peptides be isolated for satiety supplementation?
- ?Does chronic high-protein diet alter satiety pathway sensitivity?
Trust & Context
- Key Stat:
- Two satiety pathways Protein digestion activates both CCK and opioid satiety signals — and the ratio varies by protein source, meaning food choice affects HOW you feel full
- Evidence Grade:
- Moderate evidence from a controlled rat feeding study with selective receptor blocking to dissect satiety pathways.
- Study Age:
- Published in 2002. Dietary peptide satiety signaling has been further characterized, supporting high-protein diets for weight management.
- Original Title:
- Dietary peptides induce satiety via cholecystokinin-A and peripheral opioid receptors in rats.
- Published In:
- The Journal of nutrition, 132(9), 2775-80 (2002)
- Authors:
- Pupovac, Jelena, Anderson, G Harvey
- Database ID:
- RPEP-00759
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Does the type of protein matter for feeling full?
Yes. Different proteins produce different peptides during digestion that activate different fullness signals. Some proteins trigger more CCK (gut fullness) while others trigger more opioid (satisfaction) signaling.
How can this help with weight management?
By choosing protein sources that activate both satiety pathways (CCK AND opioid), you can maximize the feeling of fullness from meals, potentially reducing overall calorie intake without feeling deprived.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-00759APA
Pupovac, Jelena; Anderson, G Harvey. (2002). Dietary peptides induce satiety via cholecystokinin-A and peripheral opioid receptors in rats.. The Journal of nutrition, 132(9), 2775-80.
MLA
Pupovac, Jelena, et al. "Dietary peptides induce satiety via cholecystokinin-A and peripheral opioid receptors in rats.." The Journal of nutrition, 2002.
RethinkPeptides
RethinkPeptides Research Database. "Dietary peptides induce satiety via cholecystokinin-A and pe..." RPEP-00759. Retrieved from https://rethinkpeptides.com/research/pupovac-2002-dietary-peptides-induce-satiety
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.