PROBIOTICS

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PROBIOTICS ARE THE “FRIENDS” OF YOUR STOMACH

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Probiotics are live microorganisms (in most cases, bacteria) that are similar to beneficial microorganisms found in the human gut. They are also called “friendly bacteria” or “good bacteria.” They’re available to consumers mainly in the form of dietary supplements and foods. They can be used as complementary and alternative medicine.

Experts have debated how to define them. One widely used definition, developed by the World Health Organization and the Food and Agriculture Organization of the United Nations, is that they are “live microorganisms, which, when administered in adequate amounts, confer a health benefit on the host.” (Microorganisms are tiny living organisms–such as bacteria, viruses, and yeasts–that can be seen only under a microscope.)

Probiotics are not the same thing as prebiotics–nondigestible food ingredients that selectively stimulate the growth and/or activity of beneficial microorganisms already in people’s colons. When probiotics and prebiotics are mixed together, they form a synbiotic. (a “synbiotic” is a supplement that contains both a prebiotic and a probiotic that work together to improve the “friendly flora.”) They’re available in foods and dietary supplements (for example, capsules, tablets, and powders) and in some other forms as well.

Examples of foods containing probiotics are yogurt, fermented and unfermented milk, miso, tempeh, and some juices and soy beverages. In probiotic foods and supplements, the bacteria may have been present originally or added during preparation.

Most are bacteria similar to those naturally found in people’s guts, especially in those of breastfed infants (who have natural protection against many diseases). Most often, the bacteria come from two groups, Lactobacillus or Bifidobacterium. Within each group, there are different species (for example, Lactobacillus acidophilus and Bifidobacterium bifidus), and within each species, different strains (or varieties). A few common ones, such as Saccharomyces boulardii, are yeasts, which are different from bacteria.

Some probiotic foods date back to ancient times, such as fermented foods and cultured milk products. Interest in them in general has been growing; Americans’ spending on them nearly tripled from 1994 to 2003.

Flora Source Digestive Health

There are several reasons people are interested in them for health purposes…

First, the world is full of microorganisms (including bacteria), and so are people’s bodies–in and on the skin, in the gut, and in other orifices. Friendly bacteria are vital to proper development of the immune system, protection against microorganisms that could cause disease, and to the digestion and absorption of food and nutrients. Each person’s mix of bacteria varies. Interactions between a person and the microorganisms in his body, and among the microorganisms themselves, can be crucial to the person’s health and well-being.

This bacterial “balancing act” can be thrown off in two major ways:

1. By antibiotics, when they kill friendly bacteria in the gut along with unfriendly bacteria. Some people use probiotics to try to offset side effects from antibiotics like gas, cramping, or diarrhea. Similarly, some use them to ease symptoms of lactose intolerance–a condition in which the gut lacks the enzyme needed to digest significant amounts of the major sugar in milk, and which also causes gastrointestinal symptoms.

2. “Unfriendly” microorganisms such as disease-causing bacteria, yeasts, fungi, and parasites can also upset the balance. Researchers are exploring whether probiotics could halt these unfriendly agents in the first place and/or suppress their growth and activity in conditions like:

* Infectious diarrhea
* Irritable bowel syndrome
* Inflammatory bowel disease (e.g., ulcerative colitis and Crohn’s disease)
* Infection with Helicobacter pylori (H. pylori), a bacterium that causes most ulcers and many types of chronic stomach inflammation
* Tooth decay and periodontal disease
* Vaginal infections
* Stomach and respiratory infections that children acquire in daycare
* Skin infections

Another part of the interest in probiotics stems from the fact there are cells in the digestive tract connected with the immune system. One theory is that if you alter the microorganisms in a person’s intestinal tract (as by introducing the good bacteria), you can affect the immune system’s defenses.

Scientific understanding of them and their potential for preventing and treating health conditions is at an early stage, but moving ahead. In November 2005, a conference that was cofunded by the National Center for Complementary and Alternative Medicine (NCCAM) and convened by the American Society for Microbiology explored this topic.According to the conference report, some uses of probiotics for which there is some encouraging evidence from the study of specific probiotic formulations are as follows:

* To treat diarrhea (this is the strongest area of evidence, especially for diarrhea from rotavirus)
* To prevent and treat infections of the urinary tract or female genital tract
* To treat irritable bowel syndrome
* To reduce recurrence of bladder cancer
* To shorten how long an intestinal infection lasts that is caused by a bacterium called Clostridium difficile
* To prevent and treat pouchitis (a condition that can follow surgery to remove the colon)
* To prevent and manage atopic dermatitis (eczema) in children

Some other areas of interest to researchers are:

* What is going on at the molecular level with the bacteria themselves and how they may interact with the body (such as the gut and its bacteria) to prevent and treat diseases. Advances in technology and medicine are making it possible to study these areas much better than in the past.
* Issues of quality. For example, what happens when probiotic bacteria are treated or are added to foods–is their ability to survive, grow, and have a therapeutic effect altered?
* The best ways to administer probiotics for therapeutic purposes, as well as the best doses and schedules.
* Probiotics’ potential to help with the problem of antibiotic-resistant bacteria in the gut.
* Whether they can prevent unfriendly bacteria from getting through the skin or mucous membranes and traveling through the body (e.g., which can happen with burns, shock, trauma, or suppressed immunity).

Side Effects and Risks

Some live microorganisms have a long history of use as probiotics without causing illness in people. Their safety has not been thoroughly studied scientifically, however. More information is especially needed on how safe they are for young children, elderly people, and people with compromised immune systems.

The side effects, if they occur, tend to be mild and digestive (such as gas or bloating).

Probiotic products are taken by mouth as a dietary supplement product that contains vitamins, minerals, herbs or other botanicals, amino acids, enzymes, and/or other ingredients intended to supplement the diet. The U.S. Food and Drug Administration has special labeling requirements for dietary supplements and treats them as foods, not drugs.


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