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Randomized trial · measured other health measures

Trial in 80 adults with overweight: sleep counseling lengthened sleep and cut food intake

Tasali and colleagues · JAMA internal medicine · 2022

Original title: Effect of Sleep Extension on Objectively Assessed Energy Intake Among Adults With Overweight in Real-life Settings: A Randomized Clinical Trial.

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What the study found

Points to benefit

Sleep rose by about 1.2 hours a night. Food intake fell by -270 kcal/d (95% CI, -393 to -147 kcal/d) vs control, giving weight reduction in the sleep extension group.

The study at a glance

Type of study
Randomized trial
Who or what was studied
80 people · adults aged 21 to 40 with overweight who slept under 6.5 hours a night
What was tested
Counseling to sleep up to 8.5 hours in bed, vs keeping usual sleep
What it measured
Several kinds of outcomes
Trial registration
NCT02253368
Who has a stake
No stake declared
No conflicts reported; funded by NIH institutes.
Journal
JAMA internal medicine, 2022
Source
PubMed record 35129580. This page is based on the abstract only.

How much this study counts

  • ✓Randomized: people were put into groups by chance, so the groups start out alike.
  • •Medium size: 80 people.
  • •Measured several kinds of outcomes.
  • ✓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

Each dot is one on-topic paper on this question. Steps near the top answer the question more directly.

↑ Stronger evidence

  1. Trials in people: death and chronic disease

    0

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

  2. Trials in people: other measures

    1

    1 benefit

    ↑ This study is the ringed dot

  3. Trials in people: lab tests or safety

    0

    None among the papers we read.

  4. Population studies

    11

    5 benefit, 4 mixed, 2 no difference

  5. Blood levels and genes

    1

    1 benefit

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “How much sleep do adults need for good health?”

Lowest risk at about 7 hours.

Confidence: low. Based on 22 on-topic papers.

Read the full answer

Few other papers sit on the same step, so there is little to compare it with.

Other papers on the same step

None among the papers we read.

See all 22 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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