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Meta-analysis / Everyday Life / kids

Sugar and behaviour: the study people keep not reading

A meta-analysis published in JAMA pooled controlled trials of sugar and children's behaviour. It did not find the effect everyone expects.

EvidenceStrong

The short version

Meta-analysis · kids · 1995

Controlled trials gave children sugar or a placebo without either child or observer knowing which.

Pooled across studies, behaviour and cognition did not differ significantly.

Expectation, however, is a measurable effect in its own right.

01

What they studied

  • Published controlled trials in which children received sugar or an artificial sweetener placebo under blinded conditions, with behaviour and cognitive performance measured afterwards.
02

What they found

  • No statistically significant effect of sugar on children's behaviour or cognitive performance across the pooled studies.
  • Related work found that parents who believed their child had received sugar rated their behaviour as more hyperactive.
03

Why it matters

  • It removes one very persistent source of blame from family life — including self-blame at birthday parties.
  • It's a useful reminder that what we expect to see changes what we report seeing.
04

What it doesn't mean

  • It doesn't mean diet is irrelevant to health or that sugar is harmless generally.
  • It doesn't rule out a small effect in a small subgroup; pooled null results are not proof of no effect for anyone.
  • These are children's studies about behaviour, not studies of ADHD causation.

The bigger picture

Well established and repeatedly cited in later reviews. The belief has survived the evidence for three decades.

EvidenceStrong

Original research

Authors
Wolraich, M. L., Wilson, D. B., & White, J. W.
Study title
The effect of sugar on behavior or cognition in children: a meta-analysis
Journal
JAMA
Year
1995
Study design
Meta-analysis of blinded controlled trials
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