Hall and colleagues: ultra-processed diets and ad-libitum intake

What changed

In 20 inpatient adults, randomized two-week diet order produced higher ad-libitum intake and short-term weight gain on ultra-processed food.

Scientific scope

The record is the exact 25-author 2019 Cell Metabolism trial. It studied 20 adults over two two-week diet periods in a controlled inpatient setting; it does not by itself establish long-term disease effects, population-wide policy outcomes or one universal causal mechanism.

Evidence

The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The record is the exact 25-author 2019 Cell Metabolism trial. It studied 20 adults over two two-week diet periods in a controlled inpatient setting; it does not by itself establish long-term disease effects, population-wide policy outcomes or one universal causal mechanism.

Contributors

• The named authors listed in the linked research record · SCIENCE: Complete source byline retained in the research record; this collective display does not merge person identities or measure labor shares.

• PubMed record for the ultra-processed-diet trial
• PMC full text of the ultra-processed-diet trial

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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