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Bacteria

Lactobacillus acidophilus, which is a normal part of human flora, is also found in yogurt and other food products.

© Visuals Unlimited/Corbis

A healthy human body is actually less human than you might think; as an adult, your body is hosting at least 10 times as many microbial cells (that's bacteria, viruses and other types of microbes) as you have human cells -- probably about 100 trillion bacteria in all [source: The Human Microbiome Project Collection, Zimmer]. And they live in every nook and cranny of your body.

Fewer than 1 percent of the bacteria in the human body can cause disease or illness, and others work with the body to help it do things it may not have been able to do on its own -- for instance, Lactobacillus acidophilus, a popular active culture in yogurt, helps the body digest food and fight against that 1 percent of ill-willed microbes.

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