Can Laughing Actually Burn Calories?

Laughing does burn calories, but the effect is far more modest than viral claims suggest. A study that placed people in a sealed metabolic chamber while they watched comedy clips found that genuine laughter raised energy expenditure by roughly 10 to 20 percent above resting levels, which in practical terms means a few extra calories per minute of actual laughter.¹ The calorie burn is real and measurable, but there is more to the story of what laughing does inside your body than the number on a metabolic chart.

How Many Calories Does a Good Laugh Actually Burn?

The most rigorous measurement comes from a Vanderbilt University study that used a whole-room indirect calorimeter, essentially a sealed chamber that captures every molecule of oxygen consumed and carbon dioxide produced. Participants watched comedy clips while researchers measured their energy expenditure second by second. The average increase during genuine laughter was about 0.2 calories per minute above resting.² That number sounds almost comically small, and it is. For perspective, walking at a leisurely pace burns several times more than that.

The researchers estimated that if a person managed 10 to 15 minutes of genuine laughter spread throughout the day, the total extra energy expenditure would be in the range of about 2 to 10 calories.¹ To burn off even a single plain rice cake, you would need to laugh far more than most comedy specials can deliver. The idea that laughing for 15 minutes replaces a trip to the gym is firmly in the realm of internet myth. But dismissing the effect entirely misses something interesting about why it exists at all.

Why Laughing Uses Energy in the First Place

Laughing is surprisingly physical. What feels like a simple emotional response actually involves a coordinated burst of muscular effort across multiple body systems. When a fit of laughter hits, your body launches a rapid series of expiratory efforts at roughly 4 to 5 times per second. These bursts drive air out of your lungs so forcefully that your functional residual capacity, the volume of air left in your lungs after a normal exhale, drops by over a liter and a half.³ That is a substantial emptying of the lungs, and refilling them takes effort.

Meanwhile, the laryngeal muscles that control your vocal folds are firing in precise, high-amplitude bursts. The thyroarytenoid and lateral cricoarytenoid muscles snap your vocal folds shut in rapid succession, each closure producing one syllable of the characteristic “ha-ha-ha.” A different muscle, the posterior cricoarytenoid, fires out of phase to pry the folds back open between each syllable. Tracheal pressure swings in coordinated pulses to determine exactly when and whether each burst produces sound.⁴ This pattern is remarkably stereotyped, meaning your body runs through essentially the same motor program regardless of whether you are chuckling at a pun or howling at slapstick.

The trunk muscles get recruited heavily too. Electromyography studies of people during laughter yoga exercises show that the internal oblique muscle is activated more during laughter than during traditional crunch exercises. Other core muscles like the rectus abdominis, erector spinae, and multifidus fire at roughly half the level of a crunch, while the external oblique fires at a comparable level.⁵ Your diaphragm also plays a protective role: during a laughing fit, abdominal pressure spikes dramatically, and the diaphragm actively braces to prevent that pressure from compressing the organs in your chest.³ All of this muscular effort, compressed into bursts lasting only a few seconds each, is where the calorie burn comes from.

What Happens to Your Heart Rate

The metabolic chamber study found that heart rate during laughter rose by an average of about 2 beats per minute above resting, though the range was wide, with some people seeing jumps of nearly 27 beats per minute during particularly intense laughs.² A recent review characterized laughter episodes during comedy viewing as producing heart rate increases of around 20 percent, describing the cardiovascular response as comparable to mild-to-moderate physical activity.⁶

What is autonomically interesting is the sequence of events. During a laughing episode, your sympathetic nervous system revs up: heart rate climbs, cardiac output increases. Once the laughter subsides, a recovery phase kicks in where parasympathetic activity rises above baseline levels.⁶ That swing from activation to recovery is the same general pattern seen with interval-style exercise, where brief bursts of effort alternate with rest.

There is an interesting wrinkle involving forced laughter. Simulated laughter, where people deliberately laugh without a humorous trigger, tends to produce more pronounced cardiovascular responses than spontaneous laughter. In one comparison study, simulated laughter raised heart rate significantly higher than spontaneous laughter during comedy clips, partly because people in the simulated condition simply produced more total laughter.⁷ This has practical implications for laughter-based interventions, which we will return to.

Why Some Laughs Burn More Than Others

The per-minute averages mask enormous person-to-person variation. In the metabolic chamber study, the range of extra energy spent per minute of laughter ran from slightly negative (yes, some laughter episodes measured below resting expenditure) all the way up to about 2.3 calories per minute above rest.² That is a striking spread. A person at the top end was burning roughly ten times more extra energy per laugh than the average.

Two factors consistently predicted higher calorie burn: how long each laugh lasted and how frequently laughs occurred. Both laughter duration and rate correlated with both energy expenditure and heart rate increase.² In practical terms, the belly-shaking, can’t-catch-your-breath kind of laughing is doing considerably more metabolic work than a quick chuckle. The type of laughter matters too: voiced laughter, the kind that produces audible “ha-ha” sounds, requires the full motor program of laryngeal muscle firing and rapid expiratory effort. Silent laughter or smiling alone does not engage the same muscular cascade and likely burns very little extra energy.

Social context also plays a role, though indirectly. People tend to laugh more frequently and more intensely when they are with others, especially in familiar or comfortable social settings.⁶ So watching a movie alone on your couch probably produces less laughter and therefore fewer extra calories than watching the same movie in a packed theater or with friends.

Beyond Calories: What Laughter Does to Blood Vessels

The calorie question gets all the attention, but some of the more compelling physical effects of laughter show up in your blood vessels. In a study measuring brachial artery function, watching a comedy that provoked laughter increased flow-mediated vasodilation by about 17 percent. When the same participants watched a stressful documentary instead, vasodilation decreased by about 15 percent.⁸ Flow-mediated vasodilation is a measure of how well your blood vessels relax and expand in response to increased blood flow. It is one of the early markers that cardiovascular researchers track because impaired vasodilation is associated with long-term cardiovascular risk.

That 17 percent improvement is a meaningful acute change, on par with the vascular response to a bout of aerobic exercise. The mechanism is not fully settled, but it likely involves the transient hemodynamic changes laughter produces, including the increase in cardiac output and the subsequent parasympathetic recovery phase. Whether these acute vascular benefits translate into long-term cardiovascular protection with repeated laughter is still an open question, but the direction of the effect is consistently favorable across studies.

The Cortisol Connection

One of the most robust findings in laughter research has nothing to do with calories directly: laughter drives down cortisol, the body’s primary stress hormone. A meta-analysis pooling data from over 300 participants found that humor-based interventions reduced cortisol levels by roughly 32 percent compared to control conditions.⁹ Even a single laughter session produced a cortisol reduction of roughly 37 percent, and the effect appeared regardless of whether the laughter was triggered by watching a comedy or participating in laughter therapy.⁹

Beyond cortisol, laughter appears to reduce epinephrine and growth hormone levels while activating the brain’s dopaminergic reward circuitry.¹⁰¹¹ This hormonal shift is essentially the opposite of the stress response. Chronically elevated cortisol promotes visceral fat storage, insulin resistance, and appetite dysregulation, so a sustained habit of laughter could theoretically have downstream metabolic effects that go well beyond the handful of calories burned during the laugh itself.

Laughter and Appetite Hormones

A small crossover study explored how watching a humorous video affected two key appetite hormones: leptin and ghrelin. After the humor video, leptin levels dropped by about 15 percent from baseline, while ghrelin showed a more complex pattern, initially dipping before the video (suggesting an anticipatory effect) and then rising by about 9 percent after viewing. The distressing control video produced no significant changes in either hormone.¹²

The researchers described this hormone pattern as resembling what happens after moderate physical exercise, coining the term “laughercise.” Ghrelin stimulates appetite while also playing roles in growth hormone release and energy balance, so the post-laughter increase could reflect a healthy recalibration of appetite signaling rather than a simple hunger spike. This is a single small study and the findings need replication, but it hints that laughter may interact with metabolic regulation through pathways that have nothing to do with how many calories each chuckle burns.

Can Laughing Help You Lose Weight?

Purely from a calorie-burning standpoint, no. A few extra calories per day from laughter will not create any meaningful calorie deficit. You would need to laugh continuously for hours to match the energy cost of a brisk walk. The numbers are just too small.

But the weight question is more nuanced than calories in versus calories out. A randomized controlled trial in Japanese adults with metabolic syndrome risk factors used a laughter-based program and found effects that the researchers attributed not to the direct calorie burn but to the cascading hormonal changes. The laughter program, which included watching traditional comedy performances, reduced cortisol and appeared to decrease stress-related eating behaviors.¹³ The proposed mechanism runs through the stress axis: laughter reduces cortisol, reduced cortisol attenuates the sympathetic overdrive that promotes overeating and visceral fat storage, and the net result can be a modest improvement in metabolic markers.¹³ Laughter in this context functions less like exercise and more like a behavioral stress-management tool that happens to have metabolic side effects.

Laughter Yoga and Structured Programs

Laughter yoga combines voluntary laughter exercises with breathing techniques, typically performed in a group setting. Because the laughter is simulated and sustained, participants generally produce far more total laughter than they would passively watching a comedy. As the cardiovascular comparison study showed, simulated laughter tends to drive heart rate higher than spontaneous laughter, largely because it generates a greater total volume of laughing.⁷

An eight-week laughter yoga program in adolescent girls found measurable cardiovascular adaptations: resting heart rate, systolic blood pressure, and diastolic blood pressure all decreased after the intervention, while stroke volume and cardiac index increased.¹⁴ These changes mirror the adaptations typically seen with regular aerobic training. The control group showed no changes over the same period. Whether these adaptations come from the laughter itself, the breathing exercises, the light physical movement involved, or some combination is difficult to separate, but the overall direction is cardiovascular improvement.

The trunk muscle data adds another layer. Because laughter yoga sessions are sustained and deliberate, they produce higher activation of the internal oblique muscle than traditional abdominal exercises, with external oblique activation on par with crunches and back lifts.⁵ This does not mean laughter yoga replaces resistance training, but for populations who find conventional exercise inaccessible or unappealing, particularly older adults or people with mobility limitations, a structured laughter program may provide a genuine entry point to physical activation.

The Metabolic Equivalent Rating

Exercise scientists classify physical activities using metabolic equivalents, or METs, where 1 MET equals the energy cost of sitting quietly. The Physical Activity Compendium rates laughter at approximately 2 METs, just above the 1.8 METs assigned to standing still.¹³ Laughter yoga, which adds movement and breathing exercises to the laughter component, is estimated at 2 to 3 METs. For reference, light housework typically falls in the 2 to 3 MET range, a brisk walk lands around 3.5 to 4, and jogging sits around 7 or higher. Laughing occupies the very low end of the physical activity spectrum, somewhere between fidgeting and a slow stroll. This is consistent with the calorimetry data: the effect is real but tiny in absolute terms.

The MET rating does help resolve a common misunderstanding. You sometimes see the claim that “laughing for 10 minutes burns as many calories as 30 minutes on a treadmill.” There is no version of the data that supports this. At 2 METs, 10 minutes of sustained laughter burns roughly the same energy as 10 minutes of standing. The treadmill claim appears to have originated from a misreading or exaggeration of the original research and has propagated through social media and wellness blogs without correction. The researchers themselves were careful to frame laughter as a modest supplement to daily energy expenditure, not a substitute for physical activity.

1
PubMed Central. Energy expenditure of genuine laughter
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PubMed Central. Energy expenditure of genuine laughter – Section: RESULTS
3
PubMed. Respiratory dynamics during laughter
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PubMed. Patterns of laryngeal electromyography and the activity of the respiratory system during spontaneous laughter
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PubMed. Laughing: a demanding exercise for trunk muscles
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Arquivos Brasileiros de Cardiologia. Beyond Humor: Laughter as a Cardiovascular Stimulus
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Complementary Therapies in Medicine. A comparison of the cardiovascular effects of simulated and spontaneous laughter
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PubMed. Effect of mirthful laughter on vascular function
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PubMed Central. Laughter as medicine: A systematic review and meta-analysis of interventional studies evaluating the impact of spontaneous laughter on cortisol levels – Section: Impact of laughter on cortisol levels
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PubMed. Therapeutic Benefits of Laughter in Mental Health: A Theoretical Review
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PubMed. Humor, laughter, learning, and health! A brief review
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The FASEB Journal. Humor‐associated laughter affects appetite hormones
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PubMed Central. Effects of a laughter program on body weight and mental health among Japanese people with metabolic syndrome risk factors: a randomized controlled trial
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PubMed Central. The effect of 8 weeks of laughter yoga training on cardiorespiratory indices in adolescent girls aged 13–15 in Shahrekord – Section: Results