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Exposure to sunlight can modify intestinal microbiome

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Exposure of the skin to ultraviolet light from the sun can modify the intestinal microbiome according to a new study published in Frontiers in Microbiology. To mediate this change would be vitamin D and this would also explain the protective effect of ultraviolet light itself with regard to inflammatory bowel diseases.

It is well known that exposure to sunlight gives greater production of vitamin D in the skin. It is known, however, through studies published in recent years, also that the same greater quantity of vitamin D can alter the human intestinal microbiome. It follows that solar radiation on the skin can change the human intestinal microbiome but this has only been shown in rodents. This new study shows that this effect is also real for humans.

The researchers performed experiments on 21 healthy volunteer women. The 21 patients underwent three one-minute ultraviolet exposure sessions throughout the body for a week. Throughout the treatment, stool samples were taken and intestinal bacteria were analyzed. Blood samples were also taken to analyze vitamin D levels. The researchers discovered that the exposure of the skin to ultraviolet rays significantly increased the intestinal microbial diversity and this happened only in those people who had not taken vitamin D supplements in the course of experiments.

As explained by Bruce Vallance, a researcher at the University of British Columbia who led the study, exposure to UVB rays increased the richness and uniformity of the subjects’ microbiome. Before exposure to rays, women who did not take supplements showed a less diversified intestinal microbiome than women who already took vitamin D supplements. Among the bacteria that increased the most were the Lachnospiraceae, a genus of bacteria already previously linked with vitamin D.

“UVB light is able to modulate the composition of the intestinal microbiome in humans, through the synthesis of vitamin D,” says Vallance. Now researchers would like to discover the underlying causes but according to Vallance, it is likely that exposure to UVB light somehow affects the immune system of the skin and this, in turn, has a favorable influence on the intestinal environment for different species of bacteria.

William Stiff

A graduate of Georgia State University and a registered practitioner with the Physical Therapy Association of Georgia, William has held a long career as a physical therapist and has maintained a life-long interest in medical research and discovery. He writes for Health Shiner during his spare time, submitting a story whenever he comes across research that he feels is worth reporting. Outside of his career, William is also a passionate woodworker and painter.

3286 Heavner Avenue, Conyers Georgia, 30207
Ph: 770-785-5619
Email: [email protected]
William Stiff
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Medical Research

Tobacco also linked to worse mental health according to a new study

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Often, when reference is made to the damage of cigarette smoking, mental health is hardly ever thought about, and yet cigarettes are also bad for you. This is suggested by a study by Professor Hagai Levine of the Hebrew University of Jerusalem published in PLOS ONE.

Levine and colleagues carried out a survey of 2000 Serbian university students from different social and economic backgrounds. The researchers found that students who smoked showed higher rates of clinical depression than their non-smoking peers, two to three times.

Taking into consideration only the students of the University of Pristina, the researchers found that 14% of the smoking students suffered from depression compared to 4% of the non-smoking peers, while for the University of Belgrade the percentages were 19% compared to 11% respectively.

The same students who smoked also showed lower mental health scores than non-smokers. According to Levine, this study adds further evidence that smoking and depression may be linked; although there is no direct evidence yet that smoking causes depression, it can be said that tobacco seems to have a non-positive effect on mental health.

William Stiff

A graduate of Georgia State University and a registered practitioner with the Physical Therapy Association of Georgia, William has held a long career as a physical therapist and has maintained a life-long interest in medical research and discovery. He writes for Health Shiner during his spare time, submitting a story whenever he comes across research that he feels is worth reporting. Outside of his career, William is also a passionate woodworker and painter.

3286 Heavner Avenue, Conyers Georgia, 30207
Ph: 770-785-5619
Email: [email protected]
William Stiff
Continue Reading

Medical Research

One can evaluate hearing quality by analyzing pupil dilation according to researchers

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It may prove to be a new and effective hearing test developed by a team of neuroscientists at the University of Oregon. According to a statement on the university’s website, it is possible to assess a person’s hearing level by measuring pupil dilation.

According to the same statement, this approach could be useful to understand the quality of hearing in infants, young adults with disabilities and adults with stroke or other diseases and in general in those people for whom direct responses are not possible. The researchers performed experiments on 31 adults by monitoring the size of their pupils with eye detection technology. The detection took place while the same people performed a hearing test and while staring at an object at a monitor.

The study, published in the Journal of the Association for Research in Otorhinolaryngology, explains that this system is inspired by a discovery made by the main author of the study, Avinash Singh Bala, 10 years ago when he noticed changes in the pupils of barn owls in response to unexpected noises in their natural environment.

“What we discovered was that pupil dilation was as sensitive as the button-press method,” Bala explains. “We had presented the first data analyses at the conferences and there was a lot of resistance to the idea that by using an involuntary response we could get results as good as the button-pressing data.”

William Stiff

A graduate of Georgia State University and a registered practitioner with the Physical Therapy Association of Georgia, William has held a long career as a physical therapist and has maintained a life-long interest in medical research and discovery. He writes for Health Shiner during his spare time, submitting a story whenever he comes across research that he feels is worth reporting. Outside of his career, William is also a passionate woodworker and painter.

3286 Heavner Avenue, Conyers Georgia, 30207
Ph: 770-785-5619
Email: [email protected]
William Stiff
Continue Reading

Medical Research

New peanut butter with probiotics developed by scientist

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A new peanut butter that allows you to acquire probiotic positives was developed by researcher Dan Perlman. Probiotics are microorganisms that live in the digestive system that help to promote digestion, produce important hormones and vitamins and generally strengthen the immune system.

For years, Perlman has been looking for new ways to “pack” probiotics into food to allow people to acquire them without using pills or third-party capsules. Probiotics need to be ingested alive to take advantage of their positive characteristics but if there is not enough water or other energy sources in the food to support these bacteria, they die quickly and are therefore useless once ingested.

Walnut butters seem to be unsuitable for cramming live probiotics as they contain very little water. However, the researcher noted that when freeze-dried peanut butter bacteria come in, the bacteria themselves remain “suspended” in a sort of deep sleep, still alive but ready to get back to work and “wake up” once they are ingested by people.

This is because they remain trapped in the structure of the fat matrix of these foods, a rather crystalline fat.

In the new peanut butter developed by the researcher, there are 500 million to one billion bacteria in a two-spoon portion, the amount of a probiotic pill.

Now the researcher himself is looking for a way to make this new peanut butter with probiotics for commercial use.

William Stiff

A graduate of Georgia State University and a registered practitioner with the Physical Therapy Association of Georgia, William has held a long career as a physical therapist and has maintained a life-long interest in medical research and discovery. He writes for Health Shiner during his spare time, submitting a story whenever he comes across research that he feels is worth reporting. Outside of his career, William is also a passionate woodworker and painter.

3286 Heavner Avenue, Conyers Georgia, 30207
Ph: 770-785-5619
Email: [email protected]
William Stiff
Continue Reading
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