Good Bacteria Vs. Bad Bacteria: How Bacteria Can Be Healthy Too?

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Good bacteria are basically the group of microorganisms that do not mean any harm to our body. They are often termed as probiotic and only affect their host (in this case, Humans) in a beneficial manner. These microorganisms provide us with essential nutrients and also help us in protecting the body from infections! Believe it or not, without the billions of good bacterial cells in our body, we wouldn’t be alive today, so understanding a bit more about this bacterial balance is probably wise.

When you hear the word bacteria, it isn’t uncommon to imagine creeping hordes of microscopic germs threatening to get you and everyone you love horribly sick. We live in a world full of antibacterial soaps, germophobes, and parents who rush to administer antibiotics at the slightest sign of an infection.

However, this is only telling one half of the story. Bacteria are single-celled organisms that outnumber the cells in our body 1.3:1, but they’re not all out to make us ill. The human body is filled with “bad bacteria” AND “good bacteria”, and maintaining a proper balance is an essential part of our overall health. You’ve probably heard “good bacteria” called probiotics – a word that gets thrown around a lot in health food stores and fitness circles.

What Are Bad Bacteria?

Bad bacteria are the ones who are up to no good. They are more about ‘I want to multiply in number and make you sick and then use your body to spread multiple copies of me into the environment’.  Ya, that’s basically what they do. These bacteria can affect a variety of organs/organ systems and their ways of entering your body also varies (Through your food, water or the air that you breathe). In most cases, these bacteria can be knocked out from our body by using antibiotics. Antibiotics are drugs that either kill or inhibit the growth of the microorganism.

What Are Good Bacteria?

Good bacteria are basically the group of microorganisms that do not mean any harm to our body. They are often termed as probiotic and only affect their host (in this case, Humans) in a beneficial manner. These microorganisms provide us with essential nutrients and also help us in protecting the body from infections!

Believe it or not, without the billions of good bacterial cells in our body, we wouldn’t be alive today, so understanding a bit more about this bacterial balance is probably wise.

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Where Are Bacteria Found In The Body?

The quick answer is…. everywhere, but in reality, bacteria in the body is concentrated in three places: the mouth, skin, and gut. It can be found in other places, but these are the most common, and the ones worth examining. Estimates actually put about 3/4 of our immune system activity in the gut and digestive tracts, which has recently refocused attention on the gastrointestinal system, particularly in relation to keeping us healthy. Not only that, it is strongly believed that the bacteria in your gut can even affect your metabolism, hormonal levels, and mood!

The Gut-Brain Connection (Photo Credit: T. L. Furrer / Fotolia)
The Gut-Brain Connection (Photo Credit: T. L. Furrer / Fotolia)

Oral Bacteria Bacteria in the mouth is largely as a result of what we eat (or rather, what we eat and leave between our teeth). “Bad” oral bacteria commonly comes in the form of Streptococcus mutansPorphyromonas gingivalis, and Tannerella forsythia, while the good varieties include S. sanguinis, Actinomyces naeslundii and Veillonella dispar. Having too many bad bacteria in the mouth can lead to gingivitis, plaque build-up and a range of other oral diseases, but having too few good bacteria is also dangerous. Again, as mentioned, a bacterial balance must be struck for optimal health.

Skin Bacteria The skin is the body’s largest organ and is the barrier between external pathogens and the body. There are roughly 1,000 species of bacteria commonly found on the skin and hair follicles, most of which are harmless or mutually beneficial. Good bacteria on the skin (Staphylococcal epidermis) can help prevent bacterial infections from occurring by protecting the surface area of the skin from outside bacterium. For example, good bacteria can prevent pathogenic organisms from colonizing the skin by secreting chemicals, competing for resources on the skin, or stimulating the skin’s immune response against the invader. In exchange, the healthy bacteria have a place to live, and we don’t have to suffer through dermatitis, acne, rosacea or any other skin infection.

Boy with Acne (Photo Credit: hriana / Fotolia)
Boy with Acne (Photo Credit: hriana / Fotolia)

You may not realize this, but the very first bacteria we experience as human beings is at the moment of our birth, when we pick up bacteria from our mother “on the way out”. Therefore, natural-born infants and children are often protected against eczema and other skin-based infections at such an early age because of their early exposure to “beneficial bacteria”.

Also Read: What Are Gut Bacteria And Why Are They Important?

The Main Event – Bacteria In The Digestive System

The human gut is home to a huge range of microorganisms, most of whom enjoy the ideal temperature, acidity level and nutrient supply of the human body. The benefits of bacteria in our digestive system are incredibly important. Without them, we would be unable to digest our food, synthesize certain essential vitamins, absorb water, and fend off the dangerous bacteria that often tries to attack our gut. Some of the most important good gut bacteria include Lactobacilli, Bifidobacterium and Caulobacter.  In the stomach and digestive tracts, the most populous pathogenic bacteria include Salmonella, Clostridium, and E. coli. Food poisoning is probably the most common symptom of a bad gut bacteria taking control, but if you have enough beneficial bacteria in your stomach, you should be able to recover quickly.

Good vs. Bad Bacteria (Photo Credit: chombosan / Fotolia)
Good vs. Bad Bacteria (Photo Credit: chombosan / Fotolia)

As mentioned earlier, a significant amount of the immune system also operates out of the gut, making it one of the control centers for our overall health. Keeping the balance between “good” and “bad” microflora in this part of the body is especially important. The beneficial bacteria found in the digestive system are called probiotic bacteria, and there are also a number of foods that contain probiotics to improve your bacterial balance. Probiotics are lactic-acid producing microorganisms that are often used to make certain food products, such as fermented milk, yogurt, kombucha, sauerkraut, miso and soy. If you increase the amount of probiotics in your diet (and gut), you can neutralize harmful bacteria and reduce symptoms of diarrhea, inflammation, nutrient deficiency, cramps, constipation and bloating, as well as more serious stomach conditions and diseases.

So… What’s The Problem?

As mentioned at the top of the article, in the past few decades, we have become an increasingly “sterilized” society. For example, antibiotics can destroy both good and bad bacteria, ultimately weakening our immune system and making pathogenic bacteria more adaptive and difficult to cure. It has become quite common for parents and doctors alike to turn to antibiotics, as they are inexpensive and proven methods to treat infections, but that doesn’t mean it’s a good thing in the long run. Our hand sanitizers and intensely hygienic modern world has made it harder to have a diverse and balanced gut ecosystem.

Additionally, our diet has a significant impact on the bacteria in our bodies, but a diet high in artificial sugars, excess starches and vegetable oil can harm that balance. As more and more processed foods enter our cultural habits, the more susceptible we are to infection and poor health. Combine that with harsh, chemical cleaning products and heightened stress levels, and there is no surprise that we are seeing a sharp increase in gastrointestinal conditions like Crohn’s Disease and Celiac Disease in recent years.

Furthermore, our bodies develop tolerances and antibodies based on the bacteria that we are exposed to, largely in our early years. Research has shown that children playing in the mud, eating dirt and generally exposing their immune systems to a wide range of bacteria actually helps them have a stronger immune system as they age. Modern cleanliness and germ-obsessed behavior has robbed the past generation of those bacteria base-building experiences.

At the end of the day, if you want to protect the health and wellness of your whole body, you should start with the stomach. Keeping that balance in the eternal battle between “good” and “bad” bacteria is a lifelong journey, but one that is extremely important!

Also Read: How Do Gut Bacteria Compete With Each Other To Stay In The Gut?

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References (click to expand)
  1. Probiotic - Wikipedia. Wikipedia
  2. Skin flora - Wikipedia. Wikipedia
  3. Gut microbiota - Wikipedia. Wikipedia
  4. What is an Antibiotic? - Learn Genetics Utah. The University of Utah
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About the Author

John Staughton is a traveling writer, editor, publisher and photographer who earned his English and Integrative Biology degrees from the University of Illinois. He is the co-founder of a literary journal, Sheriff Nottingham, and the Content Director for Stain’d Arts, an arts nonprofit based in Denver. On a perpetual journey towards the idea of home, he uses words to educate, inspire, uplift and evolve.