Digestery
Diet and food › Ultra-Processed Food › Studies

Systematic review

Review of studies: ultra-processed food linked to obesity, though firm conclusions were hard

Martí Del Moral and colleagues · Nutricion hospitalaria · 2021

Original title: [Ultra-processed food consumption and obesity-a systematic 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

Studies suggest a link between ultra-processed food and obesity. Different methods and food classification systems made it hard to draw firm conclusions. No numbers given.

The study at a glance

Type of study
Systematic review
Who or what was studied
People in studies of ultra-processed food and obesity
What was tested
Ultra-processed food intake and obesity, from published studies
What it measured
The question itself: death, heart disease, diabetes and cancer
Who has a stake
No disclosure in PubMed
No disclosure in PubMed.
Journal
Nutricion hospitalaria, 2021
Source
PubMed record 33319568. This page is based on the abstract only.

How much this study counts

  • •Sums up studies found with a set search method, without pooling the numbers.
  • ✓Measured the question itself: death, heart disease, diabetes and cancer.
  • •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: 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
  • Open item for a person: Martí Del Moral 2021 direction set to harm, though authors call the evidence inconclusive and give no numbers or study count. Please confirm.

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 reviewer corrected 1 field after reading the abstract. 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
Not yet. Required before search engines may list this page.

Spot an error? Email a flag with a link to your source, or use the form on the question page.