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Pooled review (meta-analysis)

Pooled review adding 122 new articles: ultra-processed food linked to 25 health outcomes

Dai and colleagues · Clinical nutrition (Edinburgh, Scotland) · 2024

Original title: Ultra-processed foods and human health: An umbrella review and updated meta-analyses of observational evidence.

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

High intake was linked to 25 health outcomes. Strongest evidence: kidney function decline (OR: 1.25) and childhood wheezing (OR: 1.42). Diabetes, overweight and obesity were also linked. No study found a benefit.

The study at a glance

Type of study
Pooled review (meta-analysis)
Who or what was studied
122 studies · People in observational studies of ultra-processed food and health
What was tested
Higher vs lowest ultra-processed food intake, 39 meta-analyses updated with 122 new articles
What it measured
The question itself: death, heart disease, diabetes and cancer
Who has a stake
No stake declared
No competing interests declared; one grant from Cancer Research UK.
Journal
Clinical nutrition (Edinburgh, Scotland), 2024
Source
PubMed record 38688162. This page is based on the abstract only.

How much this study counts

  • ✓Pools the results of 122 studies.
  • •A pooled review is only as strong as the studies it pools.
  • ✓Measured the question itself: death, heart disease, diabetes and cancer.
  • ✓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: death and chronic disease

    2

    1 no difference, 1 harm

  2. Trials in people: other measures

    3

    1 mixed, 1 no direction, 1 harm

  3. Trials in people: lab tests or safety

    1

    1 mixed

  4. Population studies

    17

    1 mixed, 16 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 “Are ultra-processed foods bad for your health?”

Linked to worse health; cause not proven.

Confidence: low. Based on 38 on-topic papers.

Read the full answer
  • Summed up in “What reviews found”: Updated 39 pooled analyses with 122 articles on 49 health outcomes. High intake was linked to 25 outcomes, most firmly kidney function decline and childhood wheezing; diabetes and obesity evidence was highly suggestive. No study reported a benefit.
  • Open item for a person: Reviews Lane 2024, Dai 2024, Barbaresko 2025 and Pagliai 2021 pool many of the same cohorts; their agreement is not fully independent.

Other reviews on this question

See all 38 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 differed. The reviewer checked the abstract and kept the first read. 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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