Probiotics

Each of us has thousands of bacteria in our bodies – both “good” and “bad.” Stress, changes in diet, age, travel, and other factors can upset the balance of “good” and “bad” bacteria.

Probiotics are live organisms that prevent harmful bacteria from getting the upper hand by competing with them for nutrients and possibly helping inhibit their growth. Probiotics may be helpful for restoring or maintaining the balance of bacteria in the digestive tract.

Each of us has thousands of bacteria in our bodies—in fact, we have 10 times more bacteria than cells! We have both “good” and “bad” bacteria which exist in our bodies. The “good” microorganisms resist the proliferation of the “bad bacteria” to help achieve and maintain balance in your gut. They prevent the harmful bacteria from getting the upper hand by competing with them for nutrients and possibly producing substances that inhibit the growth of their opponents.

Probiotics, which are live microorganisms that when administered in adequate amounts confer a health benefit on the host, have been studied for both humans and animals. Controlled human and mechanistic studies show that probiotics may be helpful in a number of health benefit areas, including the areas of gastrointestinal health, and immune health and function.

Probiotics may be helpful for restoring or maintaining the balance of bacteria in the digestive tract. Stress, changes in your diet, age, and travel are just a few factors that can affect the balance between “good” and “bad” bacteria in our digestive tract. Probiotics may also help support the immune system, as ~70% of the immune system is located within the lower digestive tract.*

Relevant Health Areas

How much do I need?
 
There is no Recommended Daily Allowance for probiotics.
Suggested Supplements
Best Bets
Also Supports
fruits Suggested Foods

Probiotics are naturally found in certain foods, such as yogurt and fermented and unfermented foods and beverages, including milk (acidophilus milk), sauerkraut, miso, and tempeh (soybean cake).

Speak to your doctor if you are planning to take probiotic supplements.

  1. Council for Agricultural Science and Technology (CAST). 2007. Probiotics: Their Potential to Impact Human Health. Issue Paper 36. CAST, Ames, Iowa.

  2. FAO/WHO. Report on Joint FAO/WHO Expert Consultation on Evaluation of Health and Nutritional Properties of Probiotics in Food Including Powder Milk with Live Lactic Acid Bacteria. 2001. ftp://ftp.fao.org/es/esn/food/probio_report_en.pdf.

  3. FAO/WHO. Report of a Joint FAO/WHO Working Group on Drafting Guidelines for the Evaluation of Probiotics in Food. 2002. ftp://ftp.fao.org/es/esn/food/wgreport2.pdf.

  4. Harvard Medical School Family Health Guide. Health benefits of taking probiotics. www.health.harvard.edu

  5. Hempel S, Newberry S, Ruelaz A, Wang Z, Miles JNV, Suttorp M, Johnsen B, Shanman R, Slusser W, Fu N, Smith A, Roth E, Polak J, Motala A, Perry T, Shekelle P. Safety of Probiotics to Reduce Risk and Prevent or Treat Disease. Evidence Report/Technology Assessment No. 200. (Prepared by the Southern California Evidence-based Practice Center under Contract No. 290-2007-10062_I.) AHRQ Publication No. 11-E007.

  6. Rockville, MD: Agency for Healthcare Research and Quality. April 2011. www.ahrq.gov/clinic/tp/probiotictp.htm.

  7. Oelschlaeger TA: Mechanisms of probiotic actions review. Int J Med Microbiol; 2010;300(1): 57-62.

  8. National Institutes of Health. National Center for Complementary and Alternative Medicine. An Introduction to Probiotics. http://nccam.nih.gov/health/probiotics/introduction.htm

In addition to food, you can also get probiotics in supplement form. Capsules, sachets, tablet, chewables, and pearls are just a few of the formats that are available. The level of bacteria may or may not be listed on the label, as well as the specific probiotic strain.

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