Most people think of bacteria within the body as a cause of getting sick or developing certain diseases, but did you know that at all times there are actually billions of beneficial bacteria present within all of us? In fact, bacteria make up our microbiome, an integral internal ecosystem that benefits our gut health and the immune system.
Recently, the scientific community has really come to embrace the important role that bacteria have in fostering a strong immune system and keeping us healthy. Not only are all bacteria not detrimental to our health, but some are actually crucial for boosting immunity, keeping our digestive systems running smoothly, our hormone levels balanced and our brains working properly.
So what is the microbiome, why is it so important and how can we protect it? Let’s find out.
What Is the Human Microbiome?
Each of us has an internal complex ecosystem of bacteria located within our bodies that we call the microbiome. The microbiome is defined as as “community of microbes.” The vast majority of the bacterial species that make up our microbiome live in our digestive systems.
According to the Department of Chemistry & Biochemistry at the University of Colorado, “the human microbiota consists of the 10–100 trillion symbiotic microbial cells harbored by each person, primarily bacteria in the gut. The human ‘microbiome’ consists of the genes these cells harbor.” (1)
Our individual microbiomes are sometimes called our “genetic footprints” since they help determine our unique DNA, hereditary factors, predisposition to diseases, body type or body “set point weight,” and much more. The bacteria that make up our microbiomes can be found everywhere, even outside our own bodies, on nearly every surface we touch and every part of the environment we come into contact with. (2)
The microbiome can be confusing because it’s different than other organs in that it’s not just located in one location and is not very large in size, plus it has very far-reaching roles that are tied to so many different bodily functions. Even the word “microbiome” tells you a lot about how it works and the importance of its roles, since “micro” means small and “biome” means a habitat of living things.
It’s been said by some researchers that up to 90 percent of all diseases can be traced in some way back to the gut and health of the microbiome. Believe it or not, your microbiome is home to trillions of microbes, diverse organisms that help govern nearly every function of the human body in some way. The importance of our gut microbiome cannot be overstated: Poor gut health can contribute to leaky gut syndrome and autoimmune diseases and disorders like arthritis, dementia, heart disease, and cancer, while our health, fertility and longevity are also highly reliant on the balance of critters living within our guts.
Throughout our lives, we help shape our own microbiomes — plus they adapt to changes in our environment. For example, the foods you eat, how you sleep, the amount of bacteria you’re exposed to on a daily basis and the level of stress you live with all help establish the state of your microbiota.
The Microbiome Diet: Eating to Support Immunity and Lower Inflammation
Your diet plays a big part in establishing gut health and supporting your microbiome’s good bacteria. Research over the past several decades has revealed evidence that there’s an inextricable link between a person’s microbiota, digestion, body weight and metabolism. In an analysis of humans and 59 additional mammalian species, microbiome environments were shown to differ dramatically depending on the specie’s diet.
The flip side is also true: Your gut health can impact how your body extracts nutrients from your diet and stores fat. Gut microbiota seem to play an important role in obesity, and changes in bacterial strains in the gut have been shown to lead to significant changes in health and body weight after only a few days. For example, when lean germ-free mice receive a transplant of gut microbiota from conventional/fat mice, they acquire more body fat quickly without even increasing food intake, because their gut bugs influence hormone production (like insulin), nutrient extraction and fat (adipose tissue) storage. (3)
Now that you can see why it’s critical to lower inflammation and support gut health, lets’s take a look at how you can go about this.
Foods that promote inflammation include:
On the other hand, many natural foods can lower inflammation and help increase good bacteria in the gut. High-antioxidant foods help reduce gut damage caused by oxidative stress and turn down an overactive immune system while safeguarding healthy cells. Anti-inflammatory foods that should be the base of your diet include:
How Else Can You Establish a Strong Microbiome?
1. Avoid Antibiotics as Much as Possible
Antibiotics have been commonly prescribed for over 80 years now, but the problem is that they eliminate good bacteria in addition to cleaning the body of dangerous “germs,” which means they can lower immune function and raise the risk for infections, allergies and diseases. While antibiotics can save lives when they’re truly needed, they’re often overprescribed and misunderstood.
Over time, dangerous bacteria can become resistant to antibiotics, making serious infections harder to fight. (4) Before taking antibiotics or giving them to your children, talk to your doctor about alternative options and the unintended consequences to our microbiomes that can result from taking antibiotics too often and when they aren’t needed.
2. Lower Stress and Exercise More
Stress hinders immune function because your body diverts energy away from fighting off infections and places it on primary concerns that keep your alive — which is one reason why chronic stress can kill your quality of life. When your body thinks it’s facing an immediate danger, you become more susceptible to infections and experience more severe symptoms while also developing higher levels of inflammation.
Stress causes immune compounds known as cytokines to contribute to the inflammatory response that damages healthy cells. Exercise is a natural stress reliever that can help lower inflammation, balance hormones and strengthen the immune system.
3. Add Supplements
What Diseases Are Connected to the Microbiome?
The microbiome is a lot like Earth’s ecosystems, meaning as its conditions change, so do the organisms that inhabit it. Microbes interact with one another within the community they live in (our gut), plus they change in concentration depending on their surroundings — which means your diet, lifestyle, use of medications/antibiotics and environment really impact your gut health. At the forefront of how your gut microbiome determines whether or not you’ll deal with various illnesses is inflammation.
Inflammation is the root of most diseases. Studies show that an anti-inflammatory lifestyle is protective over brain neurons, balances hormones, fights the formation of tumors and has mood-enhancing benefits. While you might not think that gut health impacts your mood and energy much, think again. Gut-friendly bacteria can help manage neurotransmitter activity, which makes them natural antidepressants and anti-anxiety organisms. Instead of taking anti-inflammatory medications to manage illnesses like arthritis or heart disease, we’re much better off reducing inflammation in the body.
Poor gut health is tied to dozens of diseases, especially:
How the Gut Microbiome Works
Would you believe that within the human body there are about 10 times as many outside organisms as there are human cells? Microbes inhabit both the inside and outside of our bodies, especially residing in the gut, digestive tract, genitals, mouth and nose areas. What determines if someone’s microbiome is in good shape or not? It comes down to the balance of “bad bacteria” versus “good bacteria.”
Essentially, we need a higher ratio of gut-friendly “bugs” to outnumber those that are harmful in order to stay resilient and symptom-free. Unfortunately — due to factors like a poor diet, high amounts of stress and environmental toxin exposure — most people’s microbiomes are home to many billions of potentially dangerous bacteria, fungus, yeast and pathogens. When we carry around more pathogenic bacteria than we should, and also lack the diversity of protective bacteria we need, the microbiota suffers.
The Microbiome and Our Genes
Researchers often speak about the microbiota as the full collection of genes and microbes living within a community, in this case the community that inhabits our guts. According to the University of Utah Genetic Science Learning Center, “the human microbiome (all of our microbes’ genes) can be considered a counterpart to the human genome (all of our genes). The genes in our microbiome outnumber the genes in our genome by about 100 to 1.” (12)
You might have learned in school when you were younger that all human beings actually have very closely related genetic codes, even though we are all so different-looking as a species. What’s amazing is that each of our gut microbiomes is vastly different. One of the most amazing things about the microbiome is how different it can be from one person to another.
Estimates of the human gene catalog show that we have about 22,000 “genes” (as we normally think of them) but a staggering 3.3 million “non-redundant genes” in the human gut microbiome! The diversity among the microbiome of individuals is phenomenal: Individual humans are about 99.9 percent identical to one another in terms of their host genome but usually 80 percent to 90 percent different from one another in terms of the microbiome.
Today, researchers are rapidly working on better understanding the microbiome in order to help prevent, cure or treat symptoms of all sorts of diseases that might stem back to the community living within each of us. DNA-sequencing tools are helping us uncover various bacterial strains and how they might hinder or help the immune system. This effort is part of the Human Microbiome Project, done by the Data Analysis and Coordination Center for the National Institutes of Health. The goal is to “characterize microbial communities found at multiple human body sites and to look for correlations between changes in the microbiome and human health.” (13)
While some bacteria contribute to diseases, many do not. In fact, there are lots of bacterial strains we could benefit from having more of. At the same time, having certain diseases can negatively impact the microbiome, although we still have a lot to learn about how this happens exactly. The more we can come to understand how bacteria in the microbiome affect our genes and predispose us to diseases, the better we can personalize treatment approaches and prevent and manage diseases before they’re life-threatening.
The Microbiome Key Takeaways
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