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Evidence-based GLP-1 & peptide discussion since 2023
ForumsMASH / Liver DiseaseFibrosis regression on GLP-1 — is scarring really reversible?

Fibrosis regression on GLP-1 — is scarring really reversible?

Dr.PathRoch Sat, May 30, 2026 at 3:14 PM 21 replies 557 viewsPage 1 of 5
Dr.PathRoch
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May 30, 2026 at 3:14 PM#1

Putting this up for argument rather than for agreement. I have read it twice and I am still not certain what it supports.

The liver data is among the strongest non-weight findings in the class. The semaglutide MASH programme reported a large advantage over placebo on MASH resolution, with a substantial minority also achieving fibrosis improvement — and fibrosis is the endpoint that predicts outcomes. Mechanistically it is reduced hepatic lipogenesis, increased fatty-acid oxidation, less hepatic inflammation, and possibly a direct effect on stellate-cell activation.

Where I think it is weakest: the population was selected and supported in ways a real cohort is not, so I would read the effect size as a ceiling rather than an expectation.

The question I want answered is whether normalised enzymes tell you anything about fibrosis, and what the right follow-up measurement is. Tell me what I have not thought of.

Note on sourcing:
Figures above are from the primary publication rather than the press summary. If a number here disagrees with one you have, post yours and we will work out which of us is reading a secondary source.
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labquiet_amy
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May 30, 2026 at 3:16 PM#2
Dr.PathRoch said:
The liver data is among the strongest non-weight findings in the class.

NASH/MAFLD therapeutic landscape and liver and MASH: GLP-1 agonists are emerging as potential first-line NASH therapy. The Phase 2b data for semaglutide showed 59% NASH resolution (vs 17% placebo) with 43% achieving fibrosis improvement[1].

Mechanism: GLP-1R activation reduces hepatic lipogenesis, increases fatty acid oxidation, reduces hepatic inflammation, and may directly reduce hepatic stellate cell activation (fibrosis pathway).

With resmetirom (thyroid hormone receptor agonist) recently approved for NASH, the field is evolving rapidly. Combination approaches (GLP-1 + resmetirom) are being explored.

References:
[1] Newsome PN, et al. N Engl J Med. 2021;384(12):1113-1124.
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julia.endo
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May 30, 2026 at 3:18 PM#3
Dr.PathRoch said:
The liver data is among the strongest non-weight findings in the class.

ATTAIN trial (survodutide) context for liver and MASH: survodutide, a GLP-1/glucagon dual agonist, showed -18.7% body weight at 46 weeks in the Phase 3 ATTAIN trial. NASH resolution was achieved in ~60% of patients[1].

This is relevant to liver and MASH because survodutide's glucagon agonism specifically targets hepatic lipid metabolism — making it potentially the best-in-class agent for NASH/MAFLD comorbid with obesity.

References:
[1] Sanyal AJ, et al. N Engl J Med. 2024.
Last edited: May 30, 2026 at 9:18 PM
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Dr.GastroMayo
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May 30, 2026 at 3:20 PM#4
julia.endo said:
ATTAIN trial (survodutide) context for liver and MASH: survodutide, a GLP-1/glucagon dual agonist, showed -18.7% body weight at 46 weeks in the Phase…

Liver ultrasound comparison for liver and MASH: my hepatologist ordered serial ultrasounds to track NAFLD regression.

Baseline: "Moderate hepatic steatosis, liver span 17.2cm, echogenic texture consistent with fat infiltration"
Month 8: "Mild steatosis, liver span 15.8cm, improved echogenicity"
Month 14: "Minimal to no steatosis, normal liver span 14.5cm, normal echotexture"

My liver literally shrank and de-fattened. The ultrasound tech said she's seen this pattern increasingly in GLP-1 patients and it's remarkable how consistently the fatty liver resolves.

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jennifer_SEA
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May 30, 2026 at 3:30 PM#5
labquiet_amy said:
NASH/MAFLD therapeutic landscape and liver and MASH: GLP-1 agonists are emerging as potential first-line NASH therapy.

Same pattern here, and in the same order. Nothing to add that would improve it.

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