Evidence for sugar addiction: behavioral and neurochemical effects of intermittent, excessive sugar intake.
Level 5 - mechanism / opinion, no new human data
Narrative review of bench and animal research without direct clinical human trial data.
PubMed 17617461 · doi:10.1016/j.neubiorev.2007.04.019
What was done
This narrative review synthesized experimental findings on whether intermittent, excessive sugar consumption produces characteristics of substance dependence in rodent models. The authors evaluated evidence across four behavioral components of addiction—bingeing, withdrawal, craving, and cross-sensitization—and assessed associated neurochemical adaptations, specifically opioid and dopamine receptor dynamics and neurotransmitter release in the nucleus accumbens.
What was found
The abstract reports no quantitative metrics. Qualitatively, intermittent sugar access induced behavioral markers of dependence (bingeing, somatic and behavioral signs of withdrawal, craving, and cross-sensitization to other substances) accompanied by neurochemical changes: altered dopamine and opioid receptor binding, modified enkephalin mRNA expression, and altered release of dopamine and acetylcholine in the nucleus accumbens.
Why it matters
The review provides a neurobiological framework showing that non-drug reinforcers like sugar can engage neural addiction circuitry in rodents under specific feeding schedules, offering potential mechanistic insight into eating disorders and obesity.
Limits
The findings are derived primarily from rodent models using artificial intermittent-access protocols, limiting direct generalizability to human eating behaviors. The abstract provides no quantitative effect sizes, systematic search methodology, or primary human experimental data.
Cited by
- supports Sugar consumption stimulates dopamine release in the nucleus accumbens, activating the same reward pathway as drugs of abuse and alcohol.