Sleeve gastrectomy produces more weight loss than other weight-loss surgeries or GLP-1 medications.

See the scientific wording

Sleeve gastrectomy is the most effective intervention for weight loss when compared to other bariatric surgeries and GLP-1 receptor agonist therapy.

Supporting

Moderate

1 study

Contradicting

Strong

1 study

There's disagreement

Observational

The 2 studies we reviewed point in different directions — there's no clear consensus.

What the research says

2 studies reviewed

Supporting (1)

Moderate

Comparative effectiveness of sleeve gastrectomy and semaglutide for weight loss and metabolic outcomes: a prospective non-randomized study
Cohort StudyHuman2026
The study shows that sleeve gastrectomy leads to more weight loss than the drug semaglutide, but it didn't test against other weight-loss surgeries, so the claim that it's the best overall is a bit too strong.

Contradicting (1)

Strong

Effect of gastric bypass versus sleeve gastrectomy on the remission of type 2 diabetes, weight loss, and cardiovascular risk factors at 5 years (Oseberg): secondary outcomes of a single-centre, triple-blind, randomised controlled trial.
Randomized Controlled TrialHuman
The study found that people who had gastric bypass surgery lost more weight (22% of their body weight) than those who had sleeve gastrectomy (17%), so sleeve gastrectomy is not the best surgery for weight loss.

Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.

Scores reflect study quality, not just count.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting, 1 contradicting studies

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