Discovering Stable Blood Pressure-Lowering Peptides That Survive Digestion | Research

The takeaway

Researchers identified, screened, and characterized natural angiotensin-converting enzyme (ACE) inhibitory peptides that remain stable through digestion, explaining how food-derived peptides could lower blood pressure.

Digestion-stable
ACE-inhibitory peptides that survive stomach and intestinal processing could enable dietary blood pressure management

What the researchers found

Identified natural ACE-inhibitory peptides that maintain stability through digestion, with molecular characterization of their ACE binding and inhibition mechanisms.

Why it matters

Hypertension affects 1.3 billion people. Natural peptides that lower blood pressure through ACE inhibition — and survive digestion — could become dietary supplements or functional foods for blood pressure management.

The numbers in context

Five specific peptide sequences identified: QDPLFPL, FPGVSPF, SPAQLLPF, LVPYRP, and WYWPQ, all showing ACE inhibition and processing stability.

How the study worked

Systematic identification of ACE-inhibitory peptides. Assessed digestive stability using in vitro gastrointestinal models. Molecular modeling of ACE-peptide interactions. Characterized inhibition kinetics.

Who was studied

Foxtail millet protein hydrolysates screened for stable ACE-inhibitory peptides

What this study cannot tell us

In vitro study — in vivo blood pressure effects need confirmation. Digestive stability in test tubes may not perfectly reflect human digestion. Bioavailability after intestinal absorption is unknown.

How to read the evidence

Preliminary evidence: in vitro identification and characterization of stable ACE-inhibitory peptides. Human blood pressure effects not tested.

When this study was published

Published in 2024. Advances the identification of food-derived bioactive peptides for cardiovascular health.

The bigger picture

Food-derived bioactive peptides bridge nutrition and medicine. Identifying digestion-resistant ACE inhibitors that work like blood pressure medications opens the possibility of managing hypertension through diet rather than — or in addition to — pharmaceuticals.

Questions still open

Would consuming foods rich in these peptides meaningfully reduce blood pressure in humans?
Can these peptides be concentrated into supplements at effective doses?
How do food-derived ACE inhibitors compare to pharmaceutical ACE inhibitors in potency?

Common questions

Can food peptides lower blood pressure like medications?

Some food-derived peptides inhibit ACE — the same enzyme targeted by blood pressure drugs like lisinopril. This study identified peptides that survive digestion, but their effects are likely milder than medications. They could complement drug treatment or benefit people with mildly elevated blood pressure.

Which foods contain ACE-inhibitory peptides?

ACE-inhibitory peptides are found in dairy products (especially fermented ones like yogurt and cheese), fish, soybeans, and various grains. During digestion, proteins in these foods break down to release bioactive peptides.

Read the original research

Identification, screening and molecular mechanisms of natural stable angiotensin-converting enzyme (ACE) inhibitory peptides from foxtail millet protein hydrolysates: a combined in silico and in vitro study.

Food & function, 15(15), 7782-7793

View on PubMed ↗Publisher’s paper ↗

Citation

Zhu, Yiqing; Chen, Changyu; Dai, Zijian; Wang, Han; Zhang, Yiyun; Zhao, Qingyu; Xue, Yong; Shen, Qun. (2024). Identification, screening and molecular mechanisms of natural stable angiotensin-converting enzyme (ACE) inhibitory peptides from foxtail millet protein hydrolysates: a combined in silico and in vitro study.. Food & function, 15(15), 7782-7793. https://doi.org/10.1039/d4fo01992j