Well it turns out that stereotype might ring pretty true: Increased television viewing is directly correlated to a higher BMI, or body mass index.
Why is that? Well,studies like this one from Johns Hopkins University in Baltimore have proven that most people wrongly estimate how many calories they're consuming when they watch TV and eat at the same time.
So if watching TV makes it difficult to know how much you're really eating, you're more likely to overeat if you chow down in front of the TV screen than if you eat quietly at your table. That means more fat and calories, and more of a chance that you'll be overweight or obese—all because of Glee. Who knew?