There are over 100 trillion bacteria in the intestines, which have a significant impact on our daily health. Various intestinal bacteria maintain an exquisite balance in the human body, including bacteria that promote health and boost immunity, bacteria that worsen the intestinal environment, and bacteria that can change for either good or bad depending on the environment.<\/p>\n\n
Gut bacteria refer to the microorganisms that live in our intestines. These bacteria are essential for human health and immune function. A wide variety of bacteria coexist in the intestines, each with different roles.
Intestinal bacteria are mainly classified into three types: good bacteria, bad bacteria, and opportunistic bacteria.<\/p>\n\n
First, good bacteria are beneficial bacteria that support intestinal health. They suppress harmful substances in the intestines and improve immune function. Examples include bifidobacteria and lactobacillus.<\/p>\n\n
Next, bad bacteria are bacteria that have a negative impact on health and cause an imbalance in the intestines. When these bacteria grow, it can lead to indigestion, constipation, allergies, and even lifestyle-related diseases.<\/p>\n\n
Finally, there are opportunistic bacteria, which coexist with both good and bad bacteria and play either role depending on the situation. Their function changes depending on the intestinal environment, so it is important to maintain a balance of intestinal flora.<\/p>\n\n
As mentioned above, intestinal bacteria are broadly classified into three categories: “good bacteria,” “bad bacteria,” and “opportunistic bacteria,” but these are merely convenient categories.
1. Bifidobacterium \u2013 A major beneficial bacterium that produces lactic acid and acetic acid, regulating the intestinal environment.<\/p>\n\n
2. Lactobacillus \u2013 A type of lactic acid bacteria that aids digestion and strengthens the immune system.<\/p>\n\n
3. Escherichia coli \u2013 A type of E. coli that comes in a variety of forms, from harmless to pathogenic.<\/p>\n\n
4. Bacteroides \u2013 A major bacterium in the intestines that breaks down dietary fiber and produces short-chain fatty acids.<\/p>\n\n
5. Prevotella \u2013 Helps break down carbohydrates and its levels vary depending on your diet.<\/p>\n\n
6. Clostridium \u2013 Some are beneficial, but some species are pathogenic (such as C. difficile).<\/p>\n\n
7. Faecalibacterium \u2013 An important beneficial bacteria that produces butyric acid, which has anti-inflammatory properties.<\/p>\n\n
8. Ruminococcus \u2013 Breaks down dietary fiber and produces short-chain fatty acids.<\/p>\n\n
9. Enterococcus \u2013 Some are beneficial as probiotics, but resistance is also a problem.<\/p>\n\n
10. Streptococcus \u2013 Has both good and bad properties and is found in large quantities in the oral cavity.<\/p>\n\n
These 10 types include a mixture of good bacteria, bad bacteria, and opportunistic bacteria, but not all intestinal bacteria can be clearly classified into these three categories. Since their effects often change depending on the situation, intestinal bacteria can be said to be very dynamic.<\/p>\n\n
The particularly well-known bacteria, 1. Bifidobacterium, 2. Lactobacillus, 6. Clostridium, and 9. Enterococcus, will be explained in detail below.<\/p>\n\n
Bifidobacteria are one of the important beneficial bacteria found in the intestines, particularly in infants. They primarily produce lactic acid in the intestines, lowering the intestinal pH and suppressing the growth of harmful bacteria. This helps to improve the intestinal environment and contributes to improving immunity.
Lactic acid bacteria are a particularly well-known type of beneficial bacteria, playing an important role in our intestines. They’re found primarily in fermented foods, such as yogurt and kimchi, making them relatively familiar.
The term “lactic acid bacteria” is used in a broad sense, and the aforementioned bifidobacteria can also be considered a type of lactic acid bacteria because they produce lactic acid, but strictly speaking, bifidobacteria (Bifidobacterium) and lactic acid bacteria (such as Lactobacillus) belong to different classifications.<\/p>\n\n
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Enterococcus is an important type of beneficial bacteria found in the intestines. This bacterium plays a particularly important role in contributing to intestinal health. Enterococcus aids in food digestion and nutrient absorption, making it extremely important for maintaining a healthy intestinal environment.
Gut bacteria play a vital role in our health.<\/p>\n\n
First, they aid digestion and the effective absorption of nutrients. In particular, they break down dietary fiber and produce short-chain fatty acids, which serve as an energy source and promote intestinal motility.
Good bacteria play a very important role in the intestines.<\/p>\n\n
First and foremost, good bacteria aid digestion. In particular, they break down dietary fiber to produce short-chain fatty acids, which are used as an energy source and promote intestinal peristalsis. This improves bowel movements and helps prevent constipation.
Bad bacteria can have a negative impact on the intestinal environment. An increase in these bacteria can disrupt the intestinal flora, potentially leading to various health problems. Symptoms such as indigestion, constipation, and diarrhea are particularly common.
Opportunistic bacteria are bacteria that have the ability to transform into either beneficial or harmful bacteria depending on the intestinal environment. When the intestinal flora is in good balance, they act as beneficial bacteria, absorbing beneficial nutrients and boosting immunity. For this reason, the presence of opportunistic bacteria is extremely important for the intestinal environment.
Numerous studies have shown that gut bacteria play a significant role in health. Beneficial bacteria such as bifidobacteria and lactobacilli reside in the intestines, aiding digestion and promoting nutrient absorption. A healthy gut flora also contributes to improved immune function and may reduce the risk of infections and allergies.
To improve your intestinal environment, it’s important to keep a few points in mind. First, review your diet. By actively consuming vegetables, fruits, and beans that are high in dietary fiber, you can help promote the growth of beneficial bacteria. We especially recommend incorporating fermented foods. Yogurt, natto, and kimchi are all effective in increasing beneficial bacteria in the intestines.
Rather than continuing to hold on to difficult things or things that don’t go as planned, it’s important to put aside the heavy burden and let go of it from time to time, which will help relieve tension in the body. In this way, just being mindful of your own stress on a daily basis, not letting it build up too much, and giving yourself a little praise will likely lead to an improvement in your intestinal environment.<\/p>\n\n
Diet is one of the factors that significantly influences the intestinal environment. First, it is important to consume foods rich in dietary fiber. The dietary fiber contained in vegetables, fruits, and grains serves as food for the beneficial bacteria in the intestines, activating them. Oatmeal, beans, and seaweed are particularly effective.
Lifestyle has a major impact on the intestinal environment. Daily habits affect the balance of good and bad bacteria in the body. Fundamental factors such as diet, exercise, and sleep are particularly directly linked to intestinal flora.
In addition, good quality sleep also supports a healthy gut environment. While it may be difficult to fall asleep at 10 o’clock every night, simply getting into bed earlier can help you quietly realize how tired and exhausted your body is. Taking the time to look after yourself and getting enough sleep will help maintain harmony between your brain and body, and reducing stress will help to maintain a balanced gut environment.
Numerous studies have shown that the balance of intestinal bacteria changes with age. When we are young, our intestinal environment is active and contains many beneficial bacteria, but as we age, harmful bacteria tend to increase.
Gut bacteria play a vital role in our health. As explained here, numerous intestinal bacteria reside in the intestines, but three main types of bacteria coexist: beneficial, harmful, and opportunistic. An imbalance can have an adverse effect on health.
The Gut Flora Transplantation Clinical Research Group has already performed over 690 cases of “gut flora transplantation<\/a>,” a new procedure that does not require antibiotics and places less strain on patients. We also offer intestinal flora testing to determine your own intestinal flora. If you are interested in the current state of your intestinal flora or in improving your intestinal environment, please feel free to contact your nearest clinic<\/a>.<\/p>\n\n Supervisor: Dr. Hideaki Shima, Ph.D. in Agriculture (Symbiotics Co., Ltd.)<\/p>\n\n Release date: May 27, 2025<\/p>\n","protected":false},"excerpt":{"rendered":" There are over 100 trillion bacteria in the intestines, which have a significant impact on our daily health. Various intestinal bacteria maintain an exquisite balance in the human body, including bacteria that promote health and boost immunity, bacteria that worsen the intestinal environment, and bacteria that can change for either good or bad depending on […]<\/p>\n","protected":false},"featured_media":3645,"template":"","tags":[183],"blog_cat":[247],"class_list":["post-3731","blog","type-blog","status-publish","has-post-thumbnail","hentry","tag-the-basics-of-intestinal-bacteria","blog_cat-microbiome"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fmt.sym-biosis.co.jp\/en\/wp-json\/wp\/v2\/blog\/3731","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fmt.sym-biosis.co.jp\/en\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/fmt.sym-biosis.co.jp\/en\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fmt.sym-biosis.co.jp\/en\/wp-json\/wp\/v2\/media\/3645"}],"wp:attachment":[{"href":"https:\/\/fmt.sym-biosis.co.jp\/en\/wp-json\/wp\/v2\/media?parent=3731"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fmt.sym-biosis.co.jp\/en\/wp-json\/wp\/v2\/tags?post=3731"},{"taxonomy":"blog_cat","embeddable":true,"href":"https:\/\/fmt.sym-biosis.co.jp\/en\/wp-json\/wp\/v2\/blog_cat?post=3731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}References<\/h2>\n\n
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