When we talk about probiotics, we’re referring to what an expert panel made up of representatives from the Food and Agriculture Organization of the United Nations and the World Health Organization (FAO/WHO) defined as “live microorganisms which when administered in adequate amounts confer a health benefit on the host.”

Usually, these organisms are bacteria, but certain kinds of yeasts can also act as probiotics. Foods like yogurt, kefir, sauerkraut, tempeh, and kimchi that are made using bacterial fermentation naturally contain probiotics. You can also take probiotic supplements, as millions of Americans already do.

There are many, many strains of probiotics. To date, researchers have focused mainly on strains belonging to these nine genera (or groups):

• Lactobacillus
• Bifidobacterium
• Saccharomyces
• Enterococcus
• Streptococcus
• Pediococcus
• Leuconostoc
• Bacillus
• Escherichia coli

Each of those groups contains a number of species, which in turn are subdivided into strains. Studies show that different strains of probiotics have distinctly different benefits.

Some strains, for instance, have been linked to improved immune function. Others, however, are more effective when it comes to quelling inflammation. And still other strains have been shown to promote digestive health, enhance the appearance of skin, and more.

AGING = MUSCLE LOSS = DISEASE  ARE YOU AT RISK: LEARN MORE