Why Do Baseball Players Chew Gum? Focus, Nerves, and What the Studies Actually Say
Roon Team
Why Do Baseball Players Chew Gum? Focus, Nerves, and What the Studies Actually Say
Baseball players chew gum because it gives the mouth something to do through three hours of mostly waiting, because chewing produces a small and short-lived bump in self-rated alertness in several small studies, and because gum gradually replaced chewing tobacco as the dugout oral fixation. The habit has roots older than any current player, and the science behind it is real but modest.
Key takeaways:
- Gum's measured alertness benefit lasts roughly 15 to 20 minutes before fading to baseline, based on the largest controlled study (n=224).
- A 2025 study of rested adults found no significant effect of chewing gum on attention tasks at all.
- Gum survived MLB's 2020 COVID spitting ban; sunflower seeds and tobacco did not.
- Aaron Judge's two-piece Dubble Bubble routine is one of the sport's best-known superstitions, not a performance protocol.
Gum, Tobacco, and a Century of Dugout Habits
| Dugout option | Duration of effect | Spit required? | Alertness evidence |
|---|---|---|---|
| Bubble gum | ~15-20 min per piece (Onyper 2011) | Minimal | Small, short, mostly self-rated |
| Sunflower seeds | While cracking | Yes | None studied |
| Caffeine pouch | 6-8 hours (labeled) | No | Supported by caffeine + L-theanine literature |
| Chewing tobacco | Hours | Yes | Nicotine is a stimulant, but banned for new MLB players since 2016 |
The connection between gum and baseball runs deeper than habit. William Wrigley Jr. founded his company in Chicago in 1891, bought stock in the Cubs in 1916, took controlling interest by 1921, and by 1926 the park carried his name: Wrigley Field. The man who sold America its chewing gum literally owned the team.
Then came the tobacco alternative. In 1977, Rob Nelson, a left-handed pitcher for the Portland Mavericks, sat in the bullpen watching teammates spit tobacco and thought of shredded bubble gum in a tobacco-style pouch. He and teammate Jim Bouton developed the idea into Big League Chew, which launched in May 1980 through Amurol Products, a Wrigley subsidiary. It rang up $18 million in wholesale sales its first year. More than 800 million pouches have been sold since.
The product was always positioned as what a kid could chew instead of dip. The look was intentional. The timing was good: public health pressure on smokeless tobacco was building, and gum gave the dugout a cleaner habit.
Does Chewing Gum Help You Focus?
Short answer: a little, briefly, and mostly in how alert you feel rather than how well you perform. The research base is small and inconsistent.
The positive studies:
- Morgan, Johnson, and Miles (2014): 40 participants did a 30-minute auditory vigilance task. The gum group showed smaller declines in performance and self-rated alertness, with faster reaction times in the later stages of the task.
- Johnson, Muneem, and Miles (2013): 20 participants in a within-subjects design. Gum improved sustained-attention performance at all stages and raised self-rated alertness, contentedness, and calmness.
- Onyper et al. (2011): the largest study, with 224 undergraduates. Chewing gum for five minutes before testing improved performance for about 15 to 20 minutes, after which scores returned to baseline. Chewing gum during the tests showed no improvement at all.
The null result:
- A 2025 study from Washington State University, published in Acta Psychologica, tested rested, healthy adults on short attention tasks (PVT and SART). Chewing gum produced no significant improvement in performance, sleepiness ratings, or mood.
The review that ties it together:
Allen and Smith's review concluded that gum's effect on self-rated alertness is the consistent finding across studies. Effects on actual attention and other cognitive measures are less reliable. Translation: gum makes you feel more alert. Whether it makes you perform better is less certain.
For a deeper look at the full research picture, see our complete review of gum and focus.
The Three-Hour Problem
A starting position player gets four or five at-bats in a regulation game. The rest is standing, sitting, and waiting. A nine-inning game averages around three hours. That is a lot of dead time for a body trained to explode on command.
Gum fills the gap cheaply. Tubs of individually wrapped Dubble Bubble are commonly stocked in major league dugouts. No one tracks the exact brand split, but Dubble Bubble and Big League Chew dominate the visible supply. A piece costs a fraction of a cent. It requires no preparation. It gives the jaw something rhythmic to do, which is why players reach for it between innings without thinking.
The limitation is obvious from Onyper's data: the alertness bump from a fresh piece of gum lasts about 15 to 20 minutes. A regulation game has 17 half-innings. You would need a new piece roughly every inning to keep restarting that window, and even then the effect is modest at best.
Nerves, Bubbles, and the Superstition Layer
Some of gum's value is not chemical. It is ritual.
Aaron Judge chews two pieces of sugar-free Dubble Bubble starting before first pitch and keeps the same gum in until he makes an out. If he gets a hit, the gum stays. The habit started in college. By his own account, he will grind through a stale, flavorless wad for hours if the hits keep coming.
That is superstition, not pharmacology. Baseball is full of pre-performance rituals, and gum is one of the easiest to maintain. As for why players blow bubbles on camera, the answer is simpler than it looks: they are bored, they have gum, and bubble-blowing is automatic when you have been chewing the same piece since the second inning.
The 2020 Season: When Gum Won by Default
MLB's 2020 COVID-19 protocols banned spitting of sunflower seeds, peanut shells, and tobacco. Chewing gum was explicitly allowed. That single rule change made gum the last oral habit standing in the dugout during the shortened season.
For more on why baseball players spit and how 2020 changed dugout culture, we covered it separately.
Smokeless tobacco had already been banned for new major league players under the December 2016 CBA, though existing players were grandfathered in. Between the tobacco ban and the spitting ban, gum's share of dugout real estate grew almost by elimination.
The Limits of Gum for a Full Game
Here is the honest picture. The best evidence (Onyper, n=224) says gum's alertness window is 15 to 20 minutes per fresh piece. The 2025 WSU study says rested people on short tasks may get nothing measurable at all. Allen and Smith's review says the most consistent effect is subjective: you feel more alert, and that feeling is real, but it is not the same as performing better.
For a player waiting for a single at-bat, that may be enough. Pop a piece before stepping into the on-deck circle, and you get a brief sense of sharpness right when you need it. For staying locked in across a full three-hour game, gum is a series of 15-minute resets at best.
That gap is why some adult rec-league players now carry caffeine gum or caffeine pouches alongside their bubble gum. Different tools for different durations.
Gum Is Real, but Small
Baseball players chew gum for reasons that are part history, part mild science, and part superstition. Wrigley built the connection a century ago. Big League Chew gave it a tobacco-free identity. Small studies show a brief alertness effect, and a 2025 null result reminds us not to overstate it. The dugout gum habit persists because it is cheap, allowed, and gives the body something to do while the mind waits for the next pitch.
Frequently Asked Questions
Why do baseball players chew gum instead of tobacco?
Smokeless tobacco was banned for all new MLB players in the 2016 CBA, with existing players grandfathered. Before the ban, health campaigns and products like Big League Chew had already pushed gum as the cleaner alternative. Gum gives the same oral fixation without the cancer risk, and it is allowed under every current MLB rule.
Does chewing gum help you focus?
Several small studies say yes, briefly. The largest (Onyper 2011, n=224) found a 15-to-20-minute alertness window after chewing. A 2025 WSU study found no effect in rested adults on short tasks. The most consistent finding across reviews is a boost in self-rated alertness, not necessarily objective performance.
What gum do MLB players chew?
Dubble Bubble (individually wrapped, sugar-free) is the most commonly visible brand in dugouts. Big League Chew is iconic for its shredded, pouch-style format. No official MLB-wide contract dictates what is stocked; teams supply their own.
Why do baseball players blow bubbles?
Because they have gum in their mouths and time on their hands. There is no strategic reason. Players chew gum for hours during a game, and bubble-blowing is an automatic behavior when you are waiting between plays.
Who invented Big League Chew?
Rob Nelson, a left-handed pitcher for the Portland Mavericks, came up with the idea in the bullpen in 1977 alongside teammate Jim Bouton. The shredded gum launched in 1980 through Amurol Products, a Wrigley subsidiary, and sold $18 million wholesale in its first year.
Is gum allowed in the dugout?
Yes. Gum was explicitly permitted even during MLB's strict 2020 COVID protocols, which banned spitting seeds, shells, and tobacco. There is no current MLB rule restricting gum use in the dugout or on the field.
When the Gum Wears Off in the Fourth Inning
Onyper's 224-person study measured what every player already knows: gum's effect fades fast. Fifteen to twenty minutes, then you are back to baseline. For one at-bat, that is fine. For a full game, you are re-chewing constantly and getting less each time.
Roon is a zero-nicotine oral pouch built for the duration problem. Each pouch delivers 80 mg caffeine, 60 mg L-theanine, 25 mg methylliberine (Dynamine), and 5 mg theacrine (TeaCrine) sublingually. The felt window is 6 to 8 hours, not 15 minutes. That duration comes from methylliberine slowing caffeine's clearance: a randomized, double-blind crossover PK study (n=12) found co-administration with caffeine cut oral clearance from 41.9 to 17.1 L/hr and extended caffeine's half-life from 7.2 to 15 hours, with no increase in peak concentration (study). That study used 100 mg methylliberine and 150 mg caffeine, roughly 4x and 1.9x Roon's doses, so the magnitude at Roon's levels will be smaller. The mechanism is directionally the same. Separately, a 2025 Nutrition Reviews meta-analysis of randomized controlled trials found the caffeine-plus-L-theanine combination improved attentional task performance and self-rated alertness compared to placebo.
Roon is a caffeine pouch, not a nicotine product. It contains sucralose, not sugar. Nothing to chew, nothing to spit, no new piece every inning. One pouch before first pitch, tucked under the lip, and you have something gum cannot offer: a single dose that covers the whole game. The trade-off is that a longer caffeine half-life means stopping at least 8 hours before bed.
Tins start at $9.16 on a 12-tin subscription ($0.61 per pouch) or $15.00 for a one-time 4-pack ($1.00 per pouch). A first order comes with a 30-day money-back guarantee, one per customer, nothing to send back.
Related from Roon
- Does Chewing Gum Help Focus? What the Research Says
- Energy Gum vs. Pouches for Focus
- Focus Pouch vs. Caffeine Gum
- What Do Baseball Players Chew Now?
Written by Roon Team
