With the abundance of ambush marketing efforts at this years Olympics, do you even know which brands are the official sponsors of the London 2012 games?

Just ask Terin Izil, who has been living off officially sanctioned Olympic products since July 20th. In the ‘5 Ring Diet,’ Izil has limited what she can eat, drink, and wear exclusively to the products that display the Olympic rings on their packaging.

She’s eaten a lot of McDonald’s (interesting enough, as a vegetarian) and Chobani (who even sent her a care package to help), she’s only worn official ’Team USA’ clothing (substituting a bathing suit when she couldn’t find ‘official’ undergarments), has been sleeping on a Charmin bed, (there’s no ‘ringed’ furniture) and of course– she’s been paying for it all on her Visa.

She’s set some pretty strict rules for herself- beyond the obvious products you’d expect sponsors to brand with the Olympic Rings, she’s switched all of her personal hygiene products over to Olympic P&G products, she only showers with Dasani water, and on her trip over to London, she flew United.

Why did Izil, who works in advertising, decide to take on the challenge? On the 5 Ring Diet Tumblr, where she’s documenting her experience, she writes:

The Olympic Rings. They’re not just for athletes anymore. In fact, this season they’re popping up on everything from juice to razors and bread. And that got me thinking. Could somebody survive on only products with the Olympic rings on them?

So I’m giving it a try. And although I’m curious to see if I can sustain myself on only Olympics-sanctioned products, all this sacrifice is also for a reason. Camp Promise, a camp for people with neuromuscular disorders that I co-founded in 2009, is about $15,000 shy of its fundraising goal. And my hope is that my suffering and sacrifice just might be entertaining enough for people to take notice. And if it is, I hope you’ll donate to this wonderful camp.

Izil’s challenge is, at the same time, an interesting experiment into just how far Olympic branding extends (and doesn’t, for that matter), but even more so, an inspiring story.

5 Ring Diet