KIDS
Nutrition

Sugar makes kids hyperactive

Is this true? Make your call, then see what the science says.

Short answer: No. The evidence doesn’t support this.

The science says Not supported Strong evidence

Blinded trials found sugar does not change children's behaviour. A trial also showed parents' expectations can shape how they rate their child's behaviour. Diets high in sugar are linked to ADHD symptoms in observational studies, but that doesn't show sugar causes hyperactivity.

AI-generated summary of the research cited · not reviewed by a medical professional · checked 13 October 2026 · How we check

What the research found

A 1995 meta-analysis pooled 23 blinded studies where children had sugar or an artificial sweetener. Across 14 measures of behaviour and thinking, the results were statistically indistinguishable from no effect. The authors concluded sugar does not affect children's behaviour or cognitive performance. Paediatric guidance says the same, even at doses far above a normal diet.

Expectation seems to matter. In a 1994 randomised trial, 35 boys aged 5 to 7 all got a sweetener placebo. Mothers told their sons had had a big dose of sugar rated them as significantly more hyperactive and stayed closer to and controlled them more.

Observational research is a different story. A 2020 meta-analysis of seven studies linked sugar and soft drink intake to a higher risk of ADHD symptoms (pooled effect 1.22). A 2019 review linked unhealthy dietary patterns to ADHD. A 2026 review found 15 of 16 sugar studies reported positive links. These studies can't show cause and effect.

What it doesn’t mean

  • This doesn't mean sugar is harmless. Some researchers link added sugar to other health problems, such as tooth decay and obesity, although that relationship is described as controversial.
  • Birthday parties and Halloween can make kids wild. Paediatric guidance suggests the excitement of the event may matter more than the sugar.
  • If you're worried about your child's behaviour, attention or activity levels, talk to your GP or child health nurse rather than cutting out foods on your own.

Sources

The effect of sugar on behavior or cognition in children. A meta-analysis.JAMA, 1995Effects of sugar ingestion expectancies on mother-child interactions.Journal of abnormal child psychology, 1994Sugar consumption, sugar sweetened beverages and Attention Deficit Hyperactivity Disorder: A systematic review and meta-analysis.Complementary therapies in medicine, 2020Dietary Carbohydrates and ADHD Symptoms: A Systematic Review.Nutrients, 2026Dietary patterns and attention deficit/hyperactivity disorder (ADHD): A systematic review and meta-analysis.Journal of affective disorders, 2019The sweet danger of added sugars.European journal of paediatric dentistry, 2019Allergies and Hyperactivity - HealthyChildren.orghealthychildren.org

General information only, not medical advice. KIDS fact-checks are generated by AI from published research and are not reviewed by doctors or other health professionals. They can be wrong or out of date. Always talk to your GP or child’s doctor about your child, and call 000 in an emergency. Spotted a problem? Tell us.

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