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Pooled review (meta-analysis)

Pooled review of 46 studies in type 2 diabetes: lower blood sugar and BMI

Guo and colleagues · Oxidative medicine and cellular longevity · 2021

Original title: The Effect of Berberine on Metabolic Profiles in Type 2 Diabetic Patients: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.

Under review. A person has not yet checked this summary against the paper. It is written from the PubMed abstract. Until a person checks it, search engines are asked not to list this page.

What the study found

Points to benefit

Berberine lowered HbA1c (MD = -0.73), fasting blood sugar (MD = -0.86) and BMI (MD = -1.07, 95% CI -1.76, -0.37) compared with controls.

The study at a glance

Type of study
Pooled review (meta-analysis)
Who or what was studied
46 studies · People with type 2 diabetes
What was tested
Berberine, alone or with usual diabetes care, compared with control groups
What it measured
The question itself: body weight and blood sugar
Who has a stake
No stake declared
No competing interests declared.
Journal
Oxidative medicine and cellular longevity, 2021
Source
PubMed record 34956436. This page is based on the abstract only.

How much this study counts

  • ✓Pools the results of 46 studies.
  • •A pooled review is only as strong as the studies it pools.
  • ✓Measured the question itself: body weight and blood sugar.
  • ✓No competing interests declared.
  • •Summarized from the PubMed abstract only. The full paper may hold details the abstract leaves out.

✓ Strength– Limit• Note

These points come from fixed rules about the type of study, its size and length, what it measured, and who has a stake. Every study on Digestery gets the same rules.

Where this study sits

This paper is not on the ladder. It is a pooled review (meta-analysis), and reviews and opinion pieces discuss studies that are already counted on the steps below.

↑ Stronger evidence

  1. Trials in people: weight and blood sugar

    7

    7 benefit

  2. Trials in people: other measures

    7

    5 benefit, 1 mixed, 1 no difference

  3. Trials in people: lab tests or safety

    2

    1 benefit, 1 no difference

  4. Population studies

    2

    2 benefit

  5. Blood levels and genes

    0

    None among the papers we read.

  6. Animals

    1

    1 benefit

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “Does berberine help with weight loss and blood sugar?”

Lowers blood sugar in diabetes; weight unclear.

Confidence: low. Based on 28 on-topic papers.

Read the full answer
  • Quoted in “What we found”: Pooled trials found lower BMI with berberine in people with type 2 diabetes (MD = -1.07) and in people with fatty liver disease (SMD = - 0.58).
  • Part of the finding “Blood sugar falls in people with type 2 diabetes”.
  • Part of the finding “Weight results are mixed”.
  • Summed up in “What reviews found”: Pooled forty-six trials in type 2 diabetes. Berberine, alone or added to usual care, lowered HbA1c (MD = -0.73), fasting blood sugar (MD = -0.86) and BMI (MD = -1.07) compared with control groups.
  • Open item for a person: Pooled reviews Xie 2022, Guo 2021, Liang 2019, Lan 2015, Shi 2025 and Li 2023 likely share many trials; they are not independent evidence.

Other reviews on this question

See all 28 studies on this question

How this page was made

Label

First read of the abstract
Claude Sonnet
Independent second read
Claude Haiku
Differences settled
The two reads agreed on every checked field. Claude Opus 5.5.
Headline
Claude Sonnet, from the checked study record. A script checked its numbers and wording.
Numbers
Checked against the abstract by a script
“How much this study counts”
Fixed rules, the same for every study
Source check by a person
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