Oat protein peptides stimulate appetite-suppressing hormone CCK through calcium-sensing receptor signaling | Research

The takeaway

Four novel peptides from oat protein hydrolysate, especially QGDVVALPA, stimulate CCK secretion through calcium-sensing receptor/Gq/CaMKII signaling, with intragastric OPH administration increasing plasma CCK in mice.

QGDVVALPA = top CCK stimulator
Novel oat peptide stimulates the appetite-suppressing hormone CCK through a defined receptor-signaling pathway, potentially enabling natural appetite control foods

What the researchers found

4 novel CCK-stimulating peptides identified from oat. QGDVVALPA most potent. Mechanism: calcium-sensing receptor → Gq → intracellular Ca²⁺ → CaMKII → CCK secretion. OPH increased plasma CCK in mice.

Why it matters

Natural appetite control through food-derived peptides could complement pharmacological weight management. Identifying specific peptides and their signaling mechanism enables targeted functional food development.

How the study worked

Simulated GI digestion, mouse intragastric administration, SEC and LC-MS/MS peptide identification, STC-1 cell CCK secretion assays, receptor inhibition studies.

What this study cannot tell us

Mouse study. Specific peptide doses in food matrix unclear. Bioavailability of individual peptides in humans unknown. CCK stimulation is one of many satiety mechanisms.

How to read the evidence

Preclinical with in vivo validation. Well-defined mechanism. Translational potential for functional foods.

When this study was published

Published in 2025.

The bigger picture

Food-derived bioactive peptides that naturally stimulate satiety hormones bridge the gap between nutrition and pharmacotherapy, offering a dietary approach to appetite control that could complement GLP-1 drugs.

Questions still open

Could QGDVVALPA be developed as a functional food supplement for weight management?
Do these peptides survive human digestion to reach gut endocrine cells?
Would combining oat peptides with GLP-1 drugs enhance satiety?

Common questions

Can eating oats help control appetite?

This study found specific peptides released during oat protein digestion stimulate CCK—a hormone that tells your brain you are full. The most potent peptide, QGDVVALPA, activates a defined signaling pathway in gut cells. This provides scientific backing for oats' traditional reputation as a satisfying food.

Could this lead to appetite-control supplements?

Potentially. Now that the specific peptides and their mechanism are identified, they could be developed into functional food ingredients or supplements that naturally boost satiety. This would offer a dietary complement to weight management medications.

Read the original research

Novel Cholecystokinin Secretion-Stimulating Peptides from Oat Protein Hydrolysate: Sequence Identification and Insight into the Mechanism of Action.

Journal of agricultural and food chemistry, 73(18), 10998-11006

View on PubMed ↗Publisher’s paper ↗

Citation

Song, Hongdong; Xue, Lei; Fu, Qiuyun; Wang, Haiyan; Cao, Hongwei; Huang, Kai; Guan, Xiao. (2025). Novel Cholecystokinin Secretion-Stimulating Peptides from Oat Protein Hydrolysate: Sequence Identification and Insight into the Mechanism of Action.. Journal of agricultural and food chemistry, 73(18), 10998-11006. https://doi.org/10.1021/acs.jafc.5c00727