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Pooled review (meta-analysis)

Pooled review of 60 studies: red and processed meat linked to more bowel cancer

Ungvari and colleagues · GeroScience · 2025

Original title: Association between red and processed meat consumption and colorectal cancer risk: a comprehensive meta-analysis of prospective studies.

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 more colorectal cancer (HR = 1.15, 95% CI 1.10-1.21). Processed meat also linked to more colorectal cancer (HR = 1.21, 95% CI 1.14-1.28).

The study at a glance

Type of study
Pooled review (meta-analysis)
Who or what was studied
60 studies · Adults in 60 long-term studies of meat eating and bowel cancer
What was tested
Highest vs lowest red meat, processed meat, and total meat intake
What it measured
The question itself: cancer, heart disease and death
Who has a stake
No stake declared
No company ties declared; authors are journal editors; funded by US National Institutes of Health.
Journal
GeroScience, 2025
Source
PubMed record 40210826. This page is based on the abstract only.

How much this study counts

  • ✓Pools the results of 60 studies.
  • •A pooled review is only as strong as the studies it pools.
  • ✓Measured the question itself: cancer, heart disease and death.
  • ✓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: 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
  • Quoted in “What we found”: Across 60 long-term studies, the highest red meat eaters had more bowel cancer (HR = 1.15), and so did the highest processed meat eaters (HR = 1.21).
  • Part of the finding “Bowel cancer links are the most consistent”.
  • Summed up in “What reviews found”: Pooled 60 prospective studies. High red meat (HR = 1.15) and processed meat (HR = 1.21) intake both went with more colorectal cancer, with similar links for colon and rectal 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.

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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