Combining Lactoferrin with Green Tea Extract Boosts the Satiety Hormone GLP-1 More Than Either Alone | Research

The takeaway

Conjugating apo-lactoferrin with EGCG (green tea polyphenol) significantly upregulated GLP-1 gene and protein expression in human colon cells while preserving EGCG's antioxidant properties.

Synergistic GLP-1 boost
The lactoferrin-EGCG conjugate upregulated GLP-1 expression beyond what either component achieved alone in human colon cells

What the researchers found

Apo-lactoferrin-EGCG conjugates significantly upregulated GLP-1 gene and protein expression in NCI-H716 human colon cells beyond what either lactoferrin or EGCG achieved separately, while the conjugation protected EGCG from degradation.

Why it matters

GLP-1 is the same pathway behind semaglutide and other weight-loss drugs. Finding food-based ingredients that naturally boost GLP-1 could lead to functional foods or supplements that support appetite control and metabolic health without prescription drugs.

The numbers in context

The conjugate showed enhanced GLP-1 regulation compared to lactoferrin or EGCG alone in cell-based assays.

How the study worked

Apo-LF-EGCG conjugates were synthesized and characterized structurally. GLP-1 regulation was measured using qRT-PCR (gene expression) and ELISA (protein expression) in NCI-H716 human colon cell line. Antioxidant properties of the conjugate were also assessed.

Who was studied

Cell culture models

What this study cannot tell us

In vitro cell culture only — no evidence this conjugate boosts GLP-1 in a living person. The magnitude of GLP-1 increase is likely far smaller than pharmaceutical GLP-1 agonists. Whether the conjugate survives digestion and reaches colon cells intact is unknown. NCI-H716 is a cancer cell line, which may not perfectly represent normal gut hormone-producing cells.

How to read the evidence

Preliminary evidence from an in vitro cell culture study. The concept is promising but unvalidated in living organisms. The effect size relative to pharmaceutical GLP-1 agonists is unknown.

When this study was published

Published in 2024, reflecting growing interest in food-derived GLP-1 modulators amid the popularity of GLP-1 receptor agonist drugs.

The bigger picture

The GLP-1 pathway is one of the most important discoveries in metabolic medicine. While pharmaceutical GLP-1 agonists are highly effective, they're expensive and require injection or prescription. Identifying food-derived GLP-1 boosters could democratize access to this pathway through functional foods, though the magnitude of effect from dietary sources would likely be much smaller than drugs.

Questions still open

Does this conjugate survive gastric digestion and reach the colon intact to stimulate GLP-1 release?
How does the magnitude of GLP-1 increase compare to pharmaceutical GLP-1 agonists?
Could this be formulated into a supplement or functional beverage for appetite management?

Common questions

Could drinking green tea with milk boost GLP-1 and help with appetite?

This study doesn't support that conclusion. The researchers created a specific chemical conjugate of lactoferrin and EGCG in the lab — simply mixing tea and milk wouldn't produce the same molecule. Also, this was tested in isolated cells, not in people. While both green tea and dairy have independently shown modest metabolic benefits in some studies, the specific GLP-1-boosting conjugate effect seen here would require a specially formulated product.

How does this compare to GLP-1 drugs like semaglutide?

GLP-1 receptor agonist drugs like semaglutide directly activate GLP-1 receptors throughout the body at pharmacological doses, producing dramatic effects on appetite and blood sugar. This food-derived conjugate works upstream — it stimulates cells to produce more of the body's own GLP-1, and the effect is likely orders of magnitude smaller. Think of it as a gentle dietary nudge versus a pharmaceutical hammer.

Read the original research

Effect of Milk Protein-Polyphenol Conjugate on the Regulation of GLP-1 Hormone.

Foods (Basel, Switzerland), 13(12)

View on PubMed ↗Publisher’s paper ↗

Citation

Wazzan, Huda Abdulrahim; Abraham, Amanda N; Saiara, Noshin; Anand, Sushil; Gill, Harsharn; Shukla, Ravi. (2024). Effect of Milk Protein-Polyphenol Conjugate on the Regulation of GLP-1 Hormone.. Foods (Basel, Switzerland), 13(12). https://doi.org/10.3390/foods13121935