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Study breakdown

GIP + GLP-1 + GLP-2 Together Explain Bone Protection After Eating

RPEP-152582026Hansen, Josefine V; Mathiesen, David S; Christensen, Mikkel B; Jørgensen, Niklas R; Helsted, Mads M; Bagger, Jonatan I; Holst, Jens J; Vilsbøll, Tina; Knop, Filip K; Lund, Asger B
evidence
The takeaway

The combined infusion of GIP, GLP-1, and GLP-2 replicated the postprandial suppression of bone resorption seen with oral glucose, demonstrating that gut hormones additively protect bone after meals.

Triple peptide = eating

Combining GIP, GLP-1, and GLP-2 perfectly replicated the bone resorption suppression normally seen after eating

What the researchers found

Combined GIP+GLP-1+GLP-2 infusion during IIGI suppressed β-CTX-I (bone resorption) comparably to OGTT. Individual GIP, GLP-1 had partial effects. PINP (formation) decreased with OGTT/saline/GLP-2 but not with GIP/GLP-1/triple infusion.

Why it matters

Understanding how gut peptides protect bone after eating could lead to therapies preventing osteoporosis — especially relevant as GLP-1 drugs are used by millions.

How the study worked

Randomized crossover with 6 experimental days in 10 T2D patients: OGTT + 5 IIGIs with saline, GIP, GLP-1, GLP-2, and GIP+GLP-1+GLP-2, measuring β-CTX-I and PINP.

What this study cannot tell us

Very small sample (n=10). Only T2D patients. Acute effects may not predict chronic bone outcomes.

How to read the evidence

Elegant mechanistic crossover study in T2D patients. Small but definitive for individual and combined hormone effects.

When this study was published

Published in 2025.

The bigger picture

The gut-bone axis through incretin peptides represents a fundamental physiological connection with implications for both diabetes therapy and osteoporosis prevention.

Questions still open

  • Do GLP-1 drugs protect against osteoporosis long-term?
  • Would multi-receptor agonists (tirzepatide, retatrutide) provide bone benefits?
  • Could GLP-2 agonists be used specifically for bone protection?

Common questions

Do gut hormones protect bones?
Yes. This study proved that the bone-protective effect of eating comes from three gut hormones (GIP, GLP-1, GLP-2) working together to suppress bone breakdown after meals.
Could GLP-1 drugs help prevent osteoporosis?
Possibly. GLP-1 is one of three gut peptides that protect bones after eating. Whether GLP-1 drugs provide long-term bone benefits is an important question for the millions of people taking them.

Read the original research

The Separate and Combined Effects of GIP, GLP-1, and GLP-2 on Markers of Bone Turnover in Type 2 Diabetes.

The Journal of clinical endocrinology and metabolism, 111(3), e853-e859

View on PubMed ↗Publisher’s paper ↗

Citation

Hansen, Josefine V; Mathiesen, David S; Christensen, Mikkel B; Jørgensen, Niklas R; Helsted, Mads M; Bagger, Jonatan I; Holst, Jens J; Vilsbøll, Tina; Knop, Filip K; Lund, Asger B. (2026). The Separate and Combined Effects of GIP, GLP-1, and GLP-2 on Markers of Bone Turnover in Type 2 Diabetes.. The Journal of clinical endocrinology and metabolism, 111(3), e853-e859. https://doi.org/10.1210/clinem/dgaf482