When we think of bacteria in food, we think of disease, and things that make you sick, like E-Coli. But did you know there are foods containing "good" bacteria  that are a health plus? That's what is called a probiotic, and it's the topic of my Today Show segment.

Watch the segment from TODAY

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Our bodies contain trillions of bacteria. Probiotics refers to foods and dietary supplements that contain beneficial - or "friendly" - bacteria promoting digestive health (among other things).Although you don't need added probiotics to be healthy, these bacteria can be a support to good health. While claims abound, here are some actions, supported by strong scientific evidence:

(1) Supports and helps maintain the balance of "good" and "bad" bacteria in your digestive tract

(2) Relieves diarrhea often caused by antibiotic use (that kills good and bad bacteria in the digestive tract)

(3) Helps prevent and treat vaginal yeast infections

(4) Helps relieve symptoms of irritable bowel syndrome

Probiotics are naturally found in yogurt, and fermented foods (from sauerkraut, to soy sauce, to tempeh and miso). Some yogurts have added even more probiotics (Activia, YoPlus), to pack more of a good-bacterial punch. You'll also find probiotic bars (like Attune), and fortified cereals.

While foods should be your number one go-to choice to boost probiotic intake, there are also many dietary supplement (pills) around. Some well-known brands include Phillips Colon Health, available at most supermarkets and pharmacies, or other specialty brands often found at Whole Foods and similar stores.

Aim for a mixture of different bacteria - as you might imagine, they all have different actions. There are two major groups - Lactobacillus (acidophilus) and Bifidobacterium (bifidum), so look for these terms on the foods and supplements.

A final bit of advice: probiotics can support a healthy diet and digestive tract. Talk to your doctor before adding probiotic supplements (not food sources), and discuss whether you need further medical attention for your personal digestive issues.

What's your experience been with probiotics? I'd love to know!

We all know that eating yogurt can be a healthy choice. A cup of yogurt has about one third of our daily calcium need, and is a good source of protein, with about 10 grams per serving.

Yogurt is a dairy product produced by the bacterial fermentation of milk. It's a biological process, similar to the fermentation of grapes to produce wine. Most yogurts are made from cow's milk, but some are also produced from sheep's and goat's milk, in addition to soy. These products are great options for those with lactose intolerance or a milk-protein allergy.