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Systematic review

Review of 72 earlier pooled reviews: red meat linked to higher cancer risk

Huang and colleagues · Food chemistry · 2021

Original title: Red and processed meat consumption and cancer outcomes: Umbrella review.

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 harm

Red meat linked to higher risk of death from cancer overall and of several cancers including colorectal and lung. Each 100 g/d of red meat linked to 11%-51% higher risk; each 50 g/d of processed meat to 8%-72%.

The study at a glance

Type of study
Systematic review
Who or what was studied
72 studies · People in 72 earlier meta-analyses of meat eating and cancer
What was tested
Red meat (per 100 g/day) and processed meat (per 50 g/day) vs less
What it measured
The question itself: cancer, heart disease and death
Who has a stake
No disclosure in PubMed
No disclosure in PubMed.
Journal
Food chemistry, 2021
Source
PubMed record 33838606. This page is based on the abstract only.

How much this study counts

  • •Sums up 72 studies found with a set search method, without pooling the numbers.
  • ✓Measured the question itself: cancer, heart disease and death.
  • •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 systematic review, and reviews and opinion pieces discuss studies that are already counted on the steps below.

↑ Stronger evidence

  1. Trials in people: cancer and heart disease

    0

    Not done yet. This is the step that would answer the question.

  2. Trials in people: other measures

    0

    None among the papers we read.

  3. Trials in people: lab tests or safety

    6

    2 benefit, 4 harm

  4. Population studies

    12

    1 benefit, 2 mixed, 1 no difference, 8 harm

  5. Blood levels and genes

    0

    None among the papers we read.

↓ 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 red meat raise cancer and heart disease risk?”

Linked to higher risk, especially processed meat.

Confidence: low. Based on 30 on-topic papers.

Read the full answer
  • Part of the finding “Other cancers: lung links, breast and stomach unclear”.
  • Summed up in “What reviews found”: Reviewed 72 meta-analyses. Red meat was linked to cancer death and several cancers. Each 100 g/d of red meat and 50 g/d of processed meat went with 11%-51% and 8%-72% higher risk.
  • Marked as a key paper in the research timeline: Umbrella review of 72 meta-analyses on cancer.
  • Open item for a person: Meta-analyses Farvid 2021, Ungvari 2025, Huang 2021 and Shi 2023 likely share cohorts, so their results are not independent.
  • Open item for a person: 16 relevant papers have no conflict statement in PubMed, including the large meta-analyses Farvid 2021 and Huang 2021.

Other reviews on this question

See all 30 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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