Video games can occasionally be the source of some pretty disheartening self-realizations -- like the time Rock Band revealed that you've been lied to your entire life about your angelic singing voice, or when Vampire Rain made you realize that you have incredibly poor taste in video games. However, something tells us these revelations are a bit less heartbreaking than those about to be unleashed by Nintendo's latest best-seller, Wii Fit -- especially when the heart in question is the fragile, butter-soaked heart of an overweight child.

Or an average-weighted child, for that matter. You see, Wii Fit measures the user's Body Mass Index (BMI), a weight/height ratio commonly calculated by physicians, though the use of BMI measurements in children is criticized by many dietitians for its frequent inaccuracy. Nintendo recently issued an apology following an incident involving the hurtful labeling of a "solidly built" 10-year-old girl. So, it's like an electronic, $90 version of our fifth-grade gym teacher? We're sold!

We're used to scientists, the government and even beverage companies taking the game industry to task for contributing to the childhood obesity epidemic. But now there's a new, even more unlikely source using gaming as an obesity scapegoat -- McDonald's.

Talking to the London Times, McDonald's UK chief executive Steve Easterbrook said games are part of a "lifestyle element" that has led to a rise in childhood obesity. "There's fewer green spaces and kids are sat home playing computer games on the TV when in the past they'd have been burning off energy outside," he said.

To be fair, Easterbrook didn't lay the blame completely at gaming's feet. "The issue of obesity is complex," he said, while also acknowledging that the government, the food industry, and good old personal responsibility have their part to play in solving the problem. Still, any organization that serves a "deluxe breakfast" with 59 grams of fat should be very careful when shifting the blame.

On Monday, San Francisco mayor Gavin Newsom submitted a proposal that he hopes will curtail obesity by applying a financial deterrent to drinks with high fructose corn syrup - in other words, a surcharge on soda. (Amount of surcharge has yet to be defined.) Understandably aggravated by this measure is the American Beverage Association, who pulls out one of our favorite red herrings in its defense.

Said Kevin Keane, senior VP of the ABA, "It makes no sense to single out any one single cause of obesity, which is a complex problem." As quoted by the International Herald Tribune, "Keane said that if Newsom really wanted to fight the fat, he would take on computer and video game companies, which Keane said lured children inside when they should 'be outside burning calories.'"

Yes, folks, by this logic we shouldn't even bother to worry about soda causing obesity when video games - not Dance Dance Revolution or Rock Band drums, mind you, those other video games like BioShock and Spider Solitaire - are the bigger Cause of Fatness. In a wholly accurate scientific study, Joystiq editors reported feeling approximately 15 calories surge from our controller, through our hands, and into our bloodstreams for every double kill in Halo 3.

We jest, of course, but continuing with Keane's logic, we must say it makes no sense to single out video games when the real problem of obesity is existence itself. If Mayor Newsom really wanted to fight the fat, he should combat our very existence. If he obliterates that, then there'll be no more obesity.

Update: The ABA sends a response letter to Kotaku.

[Image Source. Via OXM; thanks, PrivateRyan]