Watching Horror Films Burns Calories; This Isn’t A Trick

It’s that time of year again. The scary masks are out, and there will soon be an army of children running around with Halloween buckets and plastic pitchforks.

Watching horror movies is one of the best things about Halloween. But did you know that watching them could help you burn as many calories as there are in a typical chocolate bar?

Good news for people who’d rather curl up behind the sofa than go to the gym. Let’s find out what the suspected reasons for the surprising form of calorie expenditure are.

A 2012 study conducted by the University of Westminster measured the oxygen intake, carbon dioxide output and heart rate of participants as they watched 10 popular horror films.

They found that watching a 90-minute horror movie burns between 100 and 185 calories, roughly the same amount as a short walk.

They ranked the films viewed in order from the most energy expended to the least:

1. The Shining: 184 calories
2. Jaws: 161 calories
3. The Exorcist: 158 calories
4. Alien: 152 calories
5. Saw: 133 calories
6. A Nightmare on Elm Street: 118 calories
7. Paranormal Activity: 111 calories
8. The Blair Witch Project: 105 calories
9. The Texas Chainsaw Massacre: 107 calories
10. [Rec]: 101 calories

But why does watching a horror movie burn more calories? Richard McKenzie, a lead researcher on the study when it was conducted, said:

The researchers found that the films featuring the most “jump scare” moments are the best calorie-burners as they cause the greatest increase in heart rate.

The study’s findings may need to be taken with a pinch of salted popcorn, though, as it uses a small sample size (10 people) and was commissioned by LoveFilm, who may or may not have had a vested interest in boosting movie sales around spooky season.

While it may never have been meant to be taken seriously, that doesn’t mean there isn’t an element of truth in its findings.

A similar study also found that stress burns calories.¹ The study took 12 healthy young men and showed them two types of films: a stress-inducing horror film and, as a control, romantic family films. It was conducted in a cross-over design, meaning the participants experienced both film genres during the trial.

The researchers found that the more stress-inducing horror films caused a greater rise in energy expenditure when compared to the romantic films.

If you’re not a horror fan, don’t worry. Another study found that laughter, the notorious other physiological response to fear, can also help increase energy expenditure, burning between 2-10 calories for every 10-15 minutes of genuine laughter.²

One final thing to note is the researchers who conducted the University of Westminster study specified that all films should be watched without distraction. That means no phones — which must sound truly terrifying to some of you.