Feeling Fit: Good bacteria

(CNN) -- It's happening all across the country -- probably even in your neighborhood. People taking live bacteria to stay healthy.

VIDEO CNN's Liz Weiss has more on probiotics, or good bacteria that may promote health Play video (QuickTime, Real or Windows Media)   EXTRA INFORMATION Chocolate demystified, next on Your Health, Saturday, February 9, 2:30 p.m. EST

They're called probiotics -- the "good" bacteria that are found naturally in foods like yogurt. Proponents say these beneficial bugs promote health, especially in the colon and intestines. Some people even say the bacteria can boost immunity.

But because it can be hard to get good bacteria through diet alone, many people are turning to supplements. And increasingly, food companies are finding ways to add good bacteria to more of their products.

Liz Weiss has details.