Does chewing gum improve concentration?
Weak EvidenceNO
Weak evidence suggests chewing gum may produce small, transient improvements in sustained attention and alertness, but effects on broader concentration and cognitive performance are inconsistent across studies and likely too small to be practically meaningful.
The Verdict
Weak evidence suggests chewing gum may produce small, transient improvements in sustained attention and alertness, but effects on broader concentration and cognitive performance are inconsistent across studies and likely too small to be practically meaningful.
What the Evidence Shows
Research on chewing gum and cognition began in earnest after early studies reported improved memory and attention during gum chewing. The proposed mechanisms include increased cerebral blood flow (10-15% increase measured by transcranial Doppler), heightened arousal via mastication-induced cortical activation, and glucose delivery from sugar-containing gum. Some studies show modest improvements in sustained attention tasks and faster reaction times during prolonged vigilance tests. However, the literature is highly inconsistent. A comprehensive meta-analysis found that while gum chewing produced small positive effects on alertness and sustained attention (d = 0.10-0.15), effects on working memory and executive function were null or negative. Importantly, several well-controlled studies found that gum chewing actually impairs short-term memory and serial recall tasks, possibly due to articulatory interference with phonological loop rehearsal. The timing of gum chewing matters: benefits appear concentrated in the first 15-20 minutes before habituating. Study designs vary enormously in gum type (sugar vs sugar-free), chewing duration, cognitive tests used, and whether gum is chewed during or before testing. Industry funding is prevalent. The overall evidence suggests any cognitive effects of gum chewing are small, task-specific, and transient.
Evidence Quality
2
Meta-Analyses
8
RCTs
5
Observational
Important Caveats
- ⚠️ Effects are very small (d = 0.10-0.15) and likely not practically meaningful
- ⚠️ Gum may impair verbal short-term memory due to articulatory interference
- ⚠️ Benefits appear to habituate within 15-20 minutes
- ⚠️ Many studies are industry-funded by gum manufacturers
- ⚠️ Results are highly inconsistent across different cognitive domains
Population Studied
Healthy adults aged 18-40 in laboratory settings; university students predominantly; some studies in adolescents and older adults
Dosage
Standard stick of sugar-free gum chewed at a comfortable pace; some studies specified chewing rate of 1.5-2 Hz
Duration
Effects studied during 5-30 minutes of chewing; most cognitive tests administered during active chewing or immediately after a 5-minute chewing period
Supporting Studies (2)
The effect of chewing gum on cognitive performance: a meta-analysis
Meta-AnalysisAllen AP, Smith AP. · Appetite (2015)
Meta-analysis of 22 studies found small positive effects of gum chewing on sustained attention (d = 0.15) and alertness (d = 0.13), though effects on memory and executive function were non-significant.
View paper (DOI) →Chewing gum differentially affects aspects of attention in healthy subjects
RCTTucha O, Mecklinger L, Maier K, et al. · Appetite (2004)
Chewing gum improved sustained attention and alertness measures in 39 healthy volunteers, with faster reaction times and fewer attentional lapses during a 30-minute vigilance task compared to non-chewing controls.
View paper (DOI) →Contradicting Studies (1)
Chewing gum impairs short-term recall through interference with rehearsal
RCTKozlov MD, Hughes RW, Jones DM. · Quarterly Journal of Experimental Psychology (2012)
Chewing gum significantly impaired serial recall of both auditory and visual item sequences in 3 experiments, demonstrating that mastication interferes with phonological rehearsal processes necessary for verbal short-term memory.
Why this disagrees:
Far from improving cognition, gum chewing actively disrupts specific memory processes by interfering with the subvocal rehearsal mechanism. This articulatory suppression effect means gum may harm performance on memory-dependent tasks even while marginally improving alertness.
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