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Pooled review (meta-analysis)

Pooled review of 28 studies, 2,313 people with type 2 diabetes: lower blood sugar

Liang and colleagues · Endocrine journal · 2019

Original title: Effects of berberine on blood glucose in patients with type 2 diabetes mellitus: a systematic literature review and a meta-analysis.

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 fasting blood sugar (WMD = -0.54 mmol/L), after-meal blood sugar (WMD = -0.94 mmol/L) and HbA1c (WMD = -0.54 mmol/L). The effect faded with treatment over 90 days, doses over 2 g/d, and age over 60.

The study at a glance

Type of study
Pooled review (meta-analysis)
Who or what was studied
28 studies, 2,313 people · People with type 2 diabetes
What was tested
Berberine compared with control groups
What it measured
The question itself: body weight and blood sugar
Who has a stake
No disclosure in PubMed
No disclosure in PubMed.
Journal
Endocrine journal, 2019
Source
PubMed record 30393248. This page is based on the abstract only.

How much this study counts

  • ✓Pools the results of 28 studies with 2,313 people.
  • •A pooled review is only as strong as the studies it pools.
  • ✓Measured the question itself: body weight and blood sugar.
  • •The PubMed record has no conflict-of-interest statement.
  • •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

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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