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Doctors have long viewed microbes as things to be gotten rid of. Viruses, after all, give us measles and the flu. Bacteria cause strep throat and food poisoning. But most microbes do not make us sick. And many are important for our health (see Strawberry Round Japanese Embroidered Neck Contrast Sleeve Tee Short Trim qZIICd).

As researchers learn more about the microbes that keep us healthy, we are coming to understand how subtle imbalances in our microbial populations can also cause disease—and how restoring the balance may lead to cures. Our new understanding may lead to more focused and effective treatments. Unlike modern antibiotics, which kill good microbes along with the bad, new drugs may kill only harmful bacteria while leaving the friendly ones alone. Others may nurture friendly bacteria, helping them outcompete the harmful ones.​

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Antibiotic-associated diarrhea

Selling Cocktail Nasty Inc Dress Gal People who take antibiotic pills to clear up an infection are sometimes left with the unfortunate after-effects of antibiotic-associated diarrhea. Antibiotics kill not only the bacteria that make us sick, but also the bacteria that keep us healthy. Antibiotics can seriously disturb the balance of our microbial populations.

To treat antibiotic-associated diarrhea, many have turned to probiotic foods like yogurt and bacteria-containing pills. But the types of bacteria in these foods and supplements tend to make up just a tiny proportion of the microbes in our intestines. Despite advertising touting their health benefits, supermarket probiotics haven't been very well studied at all.

One treatment that has been shown to be effective against extremely severe imbalances in the intestinal ecosystem is the fecal transplant. Yes, doctors take poop from a healthy family member and deliver it to the sick person's intestine—very often leading to complete recovery within days. To take away some of the "yuck" factor, a few companies are developing techniques for growing complex mixtures of intestinal bacteria in the lab.

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Dress Gal Cocktail Inc Selling Nasty Asthma/allergies

Allergies happen when the immune system over-reacts to something that is normally harmless. Allergies are rare in developing countries, but in the United States, rates of asthma and hay fever have tripled over the last 30 years. Our genes haven't changed, so the increase must have something to do with the environment, quite possibly including our microbes.

Could hand sanitizer, air filters, and anti-microbial cleaners be the problem? Some evidence suggests that when kids are exposed to bacteria, viruses, and parasites—even some that make us sick—the immune system learns how to tell the difference between things that can hurt us and things that can't. Kids living in very clean environments may miss out on important immune system training.

Additional training happens in the gut, where microbes interact closely with the immune system. Shifts in the food we eat and increases in antibiotic use affect gut microbes, possibly in a way that is harmful to the immune system.

Babies who take antibiotics during the first year of life are more likely to develop asthma.


The search for the cause of autism has turned up several weak genetic links and many suspected environmental triggers. Now researchers have learned that microbes may also be involved.

Dress Nasty Selling Inc Cocktail Gal A few small studies have shown that children with autism have different microbes living in their intestines than children without the disorder. This difference could be explained by the often picky eating habits of autistic children. Or the difference could be a side effect of an underlying genetic or environmental trigger—autistic children commonly have gastrointestinal problems. Still, the connection is intriguing.

The causes of autism are varied and complex, and the same measures may prevent the disease in some but not in others. By learning about the connection between autism and microbes, we have the potential to find more ways to fight the disorder.

Autoimmune disease (multiple sclerosis, lupus, rheumatoid arthritis)

In people with autoimmune diseases, the immune system becomes confused and starts attacking the body's own tissues. With multiple sclerosis, the immune system attacks the protective wrappings around nerves and brain tissue. With rheumatoid arthritis, it attacks connective tissue in the joints. Dozens of other autoimmune diseases involve other organs and tissues throughout the body.

As with asthma and allergies, autoimmune diseases may be more likely to happen when the immune system doesn't get the proper training during childhood. Much of this training happens in and around the large intestine, and microbes are a big part of the process. Certain types of microbes living in the gut may protect us from autoimmune diseases, and others seem to make us more vulnerable.

Mice that have segmented filamentous bacteria living in their gut are more affected by arthritis and encephalomyelitis, an autoimmune disease of the brain and spinal cord. Also in mice, certain microbes protect against type-1 diabetes, in which immune cells attack the insulin-producing cells of the pancreas.

In people with multiple sclerosis, the immune system attacks myelin, the substance that insulates nerve fibers.


There is some evidence that microbes may have an indirect role in cancer. For example, some microbes cause inflammation, which appears to increase cancer risk.

Inc Cocktail Gal Selling Nasty Dress A number of microbes also have more direct connections to cancer. H. pylori bacteria, a common cause of stomach ulcers, is also associated with cancers of the stomach and esophagus. A number of viruses cause cancer as well: Hepatitis B and C greatly increase the risk of liver cancer; the sexually transmitted HPV (human papilloma virus) is associated with many cervical cancers; and EBV (Epstein-Barr virus, the cause of mononucleosis) is associated with lymphomas (cancerous white blood cells) and other cancers.

In cancer, the body's own cells multiply and grow out of control.

Dental cavities

You probably know that eating lots of sticky, sugary foods leads to cavities. But did you know that microbes were involved? Dental plaque, the sticky layer that forms on our teeth when we don't brush, contains hundreds of species of microbes. A few of these are bacteria that use sugar as food and release acid as a byproduct. The acid eats through the hard enamel on the outside of our teeth, causing cavities. Bacteria can then grow inside our teeth, leading to infection. When we brush our teeth, we scrub away the microbes.

People with lots of cavities tend to have certain species of mouth bacteria, and people with healthy teeth tend to have others. It turns out that even though we have lots of different kinds of bacteria in our mouths, just a few cause cavities. In the future, we may be able to buy a mouthwash that targets these bacteria, protecting us from tooth decay. Meanwhile, the good news is that we know how to protect ourselves from getting cavities: cut down on sugar, and brush teeth at least twice every day.

Depression and anxiety

We are only beginning to understand the connections between our microbes and behavior. Doctors have long known that certain infectious microbes can influence behavior: the rabies virus causes insomnia, agitation, and fear of water; the protist Toxoplasma gondi takes away rodents' fear of cats. So it shouldn't have been surprising when researchers found that some microbe-related intestinal disorders are associated with anxiety, depression, and other mental symptoms.

The vagus nerve runs between the gut and the brain, carrying information in both directions. Stimulation of the vagus nerve is sometimes used to treat depression. Could future treatments for anxiety and depression involve manipulating gut microbes?

Interestingly, skin appears to be part of this connection as well. Patients with the skin condition acne rosacea have a higher incidence of depression than the general population, and some evidence suggests that swallowing certain types of bacteria may improve both the acne and the depression.


The hormone insulin signals our cells to take up sugar (glucose) from our blood. People with type 2 diabetes are less responsive than normal to insulin—they are "insulin resistant." Without treatment, blood sugar levels can become dangerously high, gradually damaging the kidneys, eyes, blood vessels, and nerves.

Type 2 diabetes is much more common today than it was few decades ago, and its rise may have come from our shift to a high-fat, high-sugar diet. Changing what we put into our guts can shift the population of microbes that live there.

Researchers in Amsterdam have shown that it may be possible to shift microbial communities back to a healthier state. Obese men with insulin resistance received microbes from thin, healthy men. After just six weeks, the obese men were more responsive to insulin, and their blood sugar levels dropped to healthier levels.

Cells in the pancreas make insulin, a hormone that controls the amount of sugar in our blood.

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Hardening of the arteries

Hardening of the arteries, also called atherosclerosis, happens when a layer of sticky plaque builds up on the inside walls of blood vessels. A thick layer of plaque leaves less room for blood to flow, and tissue can become starved for oxygen. When pieces of plaque break off, they can become stuck in smaller blood vessels, completely blocking blood flow. People with hardening of the arteries often have no symptoms until something serious happens, like a heart attack or stroke.

Decades ago, doctors noticed that many of their heart-attack patients also had red, irritated gums. Later, researchers found that plaque in blood vessels contains types of bacteria that normally live in the mouth. The best guess is that bacteria are entering the blood stream through blood vessels in unhealthy gums near infected teeth.

The connection between plaque on teeth and plaque in blood vessels raises some interesting questions. Does good dental care prevent hardening of the arteries? Could scanning dental plaque for certain types of microbes diagnose disease before patients are struck down by heart attack or stroke? Could treating dental plaque also clear away blood-vessel plaque? There are many areas to explore.

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Inflammatory bowel diseases

Inflammatory bowel diseases (including Crohn's disease, Ulcerative colitis, and others) are a group of disorders that affect the intestines. These often painful conditions leave sufferers with vomiting, diarrhea, and anemia (low iron). In the worst cases, surgeons must remove damaged sections of intestine.

Interactions between microbes and the cells that line the intestine appear to be important in inflammatory bowel disease. Some types of bacteria release molecules that irritate the intestine, loosen the connections between cells, and allow large molecules to leak through the intestinal wall into the blood stream. Some people with Crohn's disease also have a genetic variation that changes how their cells interact with microbes. The variation is in the NOD2 gene, which codes for a protein that recognizes and helps to kill certain types of bacteria when they get uncomfortably close to the cells that line the intestine. A defect in this mechanism allows bacteria to invade the intestinal wall, where they can cause inflammation and infection.

Future treatments may focus on discouraging the growth of bacteria that cause inflammation and encouraging the growth of ones that suppress it.


Dress Nasty Inc Selling Cocktail Gal The Food and Agriculture Organization of the United Nations estimates that nearly a billion people around the world either don't have enough to eat or are missing important vitamins and minerals. In children, malnutrition can lead to life-long health problems.

Malnutrition isn't simply a matter of lacking calories and nutrients. Some people eat enough nutrients but can't absorb them. One clue about the role of microbes came from looking at identical twins, one twin undernourished and the other one not. The twins had the same genes, and they ate the same food—but they had different gut microbiota.

Our microbial communities are established during our first few years, and they influence our health for life. If we learn more about the relationship between microbes and nutrition, we may be able to help babies grow healthy microbes right from the start. By manipulating the microbiome, doctors may be able to help patients take in more nutrients from essentially the same food.


Thin people and obese people tend to have different types of microbes living in their guts. And when obese people lose weight, their microbiota change accordingly. With rates of obesity and related health problems increasing at an alarming rate, it has become an area of intense research.

Obesity is highly heritable, and it probably involves genes that pass from parent to child. And body weight is clearly influenced by diet, so the environment and personal habits also play a role. However, several studies have also turned up evidence linking obesity to the microbiome:

  • Gal Cocktail Selling Dress Nasty Inc A diet high in fat, sugar, and simple carbs is bad for the "healthy" gut microbes that keep us thin while it encourages the growth of "unhealthy" microbes that make us obese.
  • Obese individuals harbor microbes that are better at extracting energy from food, as well as microbes that signal the body to store energy as fat.
  • Bacteria transplanted from overweight mice to thin mice make the thin mice gain weight.

The relationship among genetics, the environment, and the microbiome as it relates to obesity is certainly complex. But while the genome is fixed and habits are hard to change, the microbiome is changeable. In the reverse of the mouse study described above, could microbes from thin people help obese people become healthier? Or could a nutritional supplement help healthy microbes grow?

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Dress Nasty Inc Gal Cocktail Selling Grice, E.A. & Segre, J.A. (2011). The skin microbiome. Nature Reviews Microbiology, 9, 244-253. doi: 10.1038/nrmicro2537

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APA format:

Genetic Science Learning Center. (2014, August 15) The Microbiome and Disease. Retrieved September 05, 2018, from https://learn.genetics.utah.edu/content/microbiome/disease/

CSE format:

The Microbiome and Disease [Internet]. Salt Lake City (UT): Genetic Science Learning Center; 2014 [cited 2018 Sep 5] Available from https://learn.genetics.utah.edu/content/microbiome/disease/

Chicago format:

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Genetic Science Learning Center. "The Microbiome and Disease." Learn.Genetics. August 15, 2014. Accessed September 5, 2018. https://learn.genetics.utah.edu/content/microbiome/disease/.