What you don't know may not hurt you, but it can certainly turn your stomach.

When we read two recent studies that found fecal matter in fast-food drinks and "gross contamination" from human bodies on retail clothing, we were so skeeved out, we'll probably be off shopping and Big Gulps for, like, a whole week.

ABC's "Good Morning America" recently did a study and tested everything from tighty-whiteys to denim jeans (both designer and bargain-priced). After sending the clothing to the lab, scientists found that what we thought was "brand new" and "clean" clothing was actually soiled with tons of different bacteria. And we thought trying on swimsuits was bad enough.

"Some garments were grossly contaminated with many organisms ... indicating that either many people tried or ... someone tried it on with heavy contamination," said Dr. Phillip Tierno, director of microbiology and immunology at New York University. "In a sense, you are touching somebody's armpit or groin. So you want to be protected, that's all."

On one jacket, the lab found respiratory, skin and some fecal particles, but the sickest item of all was a silk blouse containing "vaginal organisms, yeast and more fecal germs."

If you think that's nasty, apparently clothing isn't the only thing that can be thrown into the secretly dirty pile. The soft drink that comes with your value meal can also carry lots of germs -- mainly ones that can be found in poo.

A group of microbiologists from Hollins University took soda samples from 30 fountains at a number of fast food chains and found that 48 percent of sodas had coliform bacteria in it, which is usually found in fecal matter.

While Grist blogger Tom Laskawy told Tampa's WFTS that only one person has suffered from this, and that was 10 years ago, it doesn't change the fact that coliform can make people sick and should be reported.

So the next time you decide try on a top with a makeup stain on the collar or get a super-size Coke with your value meal, consider all the creepy-crawlies you could be becoming one with. It's enough to make you buy a Snuggie that's been hermetically sealed.