Written by Kris Grunnars

Did you know that the bacteria in your body outnumber your body’s cells 10 to 1?

It’s true, and most of them reside in your gut.

But there really is no need to panic, most bacteria are quite harmless.

Having the right bacteria in there has even been linked to numerous health benefits (1).

This includes weight loss, improved digestion, enhanced immune function, better skin and a reduced risk of many diseases (2).

This leads us to the topic at hand, probiotics.

Probiotics are foods or supplements that contain these friendly bacteria, and are supposed to help colonize our guts with health-boosting microorganisms.

The importance of this can not be overstated.

Taking care of your gut, and the friendly bacteria that reside there, may be one of thesingle most important things you can do for your health.

What Are Probiotics?

According to the official definition, probiotics are “live microorganisms that, when administered in adequate amounts, confer a health benefit on the host” (3).

Probiotics are usually bacteria, but there is also a type of yeast that can function as a probiotic.

You can get probiotics from supplements, as well as foods that are prepared by bacterial fermentation.

Probiotic foods include yogurt, kefir, sauerkraut, tempeh, kimchi and others.

Probiotics should not be confused with prebiotics (note the “e”), which are dietary fibers that help feed the friendly bacteria that are already in the gut (4).

There are actually dozens of different probiotic bacteria that have been shown to have health benefits.

The most common groups include Lactobacillus and Bifidobacterium. Then there are many different species within each group, and each species has many strains.

Interestingly, different probiotics seem to work for different health conditions. Therefore, choosing the right type (or types) of probiotic is essential.

Many probiotic supplements combine different species together in the same supplement. These are known as broad-spectrum probiotics, or multi-probiotics.

Keep in mind that this is a new but rapidly expanding area of research.

Although the evidence is promising, it is not conclusively proven that probiotics help with all the health conditions mentioned in this article (5).

The Importance of Microorganisms in The Gut

The complex community of microorganisms in your gut is called the gut flora (6).

Your gut actually contains hundreds of different types of microorganisms, with some numbers going as high as 1000.

This includes bacteria, yeasts and viruses. The great majority is bacteria.

Most of the gut flora is found in the colon, or large intestine, the last part of the digestive tract.

The metabolic activities of the gut flora actually resemble those of an organ. For this reason, some scientists refer to the gut flora as the “forgotten organ” (7).

The gut flora actually performs many functions that are important for health. It manufactures vitamins, including vitamin K and some of the B vitamins (8).

It also turns fibers into short-chain fatty acids like butyrate, propionate and acetate, which feed the gut wall and perform many metabolic functions (9, 10).

They also stimulate the immune system, and regulate the integrity of the gut. This can help prevent unwanted substances from “leaking” into the body and provoking an immune response (11, 12, 13, 14).

However, not all organisms in the gut are friendly. Some are good, others are bad.

The gut flora is actually highly sensitive to modern insults, and studies show that an “unbalanced” gut flora is linked to numerous diseases (15, 16).

This includes obesity, type 2 diabetes, metabolic syndrome, heart disease, colorectal cancer, Alzheimer’s, depression and many, many more (17, 18, 19, 20, 21, 22, 23).

Probiotics (and prebiotic fibers) can help correct this balance, making sure that our “forgotten organ” is functioning optimally (24).

Probiotics and Digestive Health

Probiotics have been studied most in regard to digestive health (25).

The strongest evidence has to do with antibiotic-associated diarrhoea.

When people take antibiotics, especially for long periods of time, they often suffer from diarrhoea for a long time after the infection has been eradicated.

This is because the antibiotics kill many of the natural bacteria in the gut, which shifts the balance and allows the “bad” bacteria to thrive.

Dozens of studies have provided strong evidence that probiotic supplements can help cure antibiotic-associated diarrhoea (26, 27, 28).

Probiotics have also been shown to be beneficial against irritable bowel syndrome, a very common digestive disorder. They can help reduce gas, bloating, constipation, diarrhoea and other symptoms (29, 30, 31).

Some studies also show that probiotics may be beneficial against inflammatory bowel diseases such as Crohn’s disease and ulcerative colitis (32).

Probiotics may also be useful against Helicobacter pylori infections, the main driver of ulcers and stomach cancer (33, 34, 35, 36).

If you currently have digestive problems that you can’t seem to get rid of, then perhaps a probiotic supplement is something you should consider.

Probiotics and Weight Loss

Obese individuals have different gut bacteria than lean people (37, 38).

Animal studies have also shown that fecal transplants from lean animals can make obese animals lose weight (39, 40).

For this reason, many scientists now believe that our gut bacteria are important in determining body fatness (41, 42).

Although this needs to be studied a lot more, some probiotic strains have been shown to help with weight loss (43).

The most impressive study on this was published in 2013. It was a study of 210 individuals with central obesity (lots of belly fat).

In this study, taking the probiotic Lactobacillus gasseri caused people to lose 8.5% of their belly fat mass over a period of 12 weeks (44).

When they stopped taking the probiotic, they gained the belly fat back within 4 weeks.

There is also some evidence that Lactobacillus rhamnosus and Bifidobacterium lactiscan help with weight loss and obesity prevention (45).

However, this needs to be studied more before any recommendations can be made.

There are also some animal studies showing that other probiotic strains could even lead to weight gain, not loss (46).

Other Health Benefits of Probiotics

Getting into all the incredible benefits of probiotics is beyond the scope of this article.

However, there are a few that are definitely worth highlighting here:

• Inflammation: Probiotics have been shown to reduce systemic inflammation, a leading driver of many diseases (47).
• Depression and anxiety: The probiotic strains Lactobacillus helveticus and Bifidobacterium longum have been shown to reduce symptoms of anxiety and depression in people with clinical depression (48, 49).
• Blood cholesterol: Several probiotics have been shown to lower total and LDL cholesterol levels (50, 51).
• Blood pressure: Probiotics have also been shown to cause modest reductions in blood pressure (52, 53).
• Immune function: Several different probiotic strains can enhance immune function and lead to reduced risk of infections, including the common cold (54,55).
• Skin health: There is some evidence that probiotics can be useful for acne, rosacea and eczema, as well as other skin disorders (56, 57, 58, 59).

This is just the tip of the iceberg. Probiotics have been studied, and shown to be beneficial, for a wide range of other health problems.

Are There Any Side Effects?

Probiotics are generally well tolerated and considered safe for most people.

However, in the first few days, you may experience side effects related to digestion. This includes gas and mild abdominal discomfort (60).

After this initial adaptation period is over, your digestion should be better than it was before.

Probiotics can be dangerous, and even lead to infections, in people with compromised immune systems. This includes people with HIV, AIDS and several other health conditions (61).

If you have a medical condition, definitely consult with your doctor before taking a probiotic supplement.

Take Home Message

Maintaining a healthy gut goes way beyond just taking a probiotic supplement.

What you do from day to day is just as important.

All sorts of lifestyle factors, especially the foods you eat, have been shown to affect the gut bacteria (62).

Living a healthy lifestyle, getting good sleep, and eating real food with lots of fiber is the key.

In many cases, probiotic foods and supplement can be helpful as well.

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