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Population study: followed a group

Study that followed 143,409 adults: sugary-to-diet swaps went with less weight gain

Espinosa and colleagues · The American journal of clinical nutrition · 2026

Original title: Artificially sweetened beverages and weight change: findings from 3 prospective cohort studies of United States adults.

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What the study found

Points to benefit

Each 3-serving a week rise in diet drinks went with -0.18 kg weight change (95% CI: -0.26 kg, -0.11 kg) per 4 years. Swapping 3 sugary servings a week for diet drinks went with -1.39 kg (95% CI: -1.50 kg, -1.28 kg).

The study at a glance

Type of study
Population study: followed a group
Who or what was studied
143,409 people · 143,409 US adults aged 26 to 65, followed a median 28 years
What was tested
Changes in diet drink intake, and swapping sugary drinks for diet drinks or water, compared with 4-year weight change
What it measured
The question itself: body weight and metabolic health
Who has a stake
No stake declared
No conflicts of interest declared; funded by NIH.
Journal
The American journal of clinical nutrition, 2026
Source
PubMed record 41794180. This page is based on the abstract only.

How much this study counts

  • –Shows a link, not a cause: people chose their own habits, and other differences between them may explain the result.
  • ✓Followed people over time, so habits were recorded before the outcome happened.
  • ✓Large: 143,409 people.
  • ✓Measured the question itself: body weight and metabolic health.
  • ✓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: body weight

    4

    1 benefit, 1 mixed, 2 no difference

  2. Trials in people: other measures

    0

    None among the papers we read.

  3. Trials in people: lab tests or safety

    7

    1 benefit, 1 mixed, 4 no difference, 1 harm

  4. Population studies

    5

    1 benefit, 4 harm

    ↑ This study is the ringed dot

  5. Blood levels and genes

    1

    1 harm

↓ Weaker evidence

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

How it fits with the other research

The short answer to “Do artificial sweeteners cause weight gain?”

Trials say no; population studies disagree.

Confidence: low. Based on 32 on-topic papers.

Read the full answer

Of the other 4 papers on the same step: 4 harm. This one found benefit. It differs from most of them.

  • Quoted in “What we found”: Population studies split: older sweetener users had 0.80 kg/m2 higher BMI over a median 10 years, but among 143,409 US adults, more diet drinks went with slightly less weight gain.
  • Part of the finding “A 28-year cohort points the other way”.
  • Marked as a key paper in the research timeline: 28-year cohort links more diet drinks to less gain.

Other papers on the same step

See all 32 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
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