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Meta Analysis of Skin Microbiome: New Link between Skin Microbiota Diversity and Skin Health with Proposal to Use This as a Future Mechanism to Determine Whether Cosmetic Products Damage the Skin.
doi.org/10.3390/cosmetics4020014
The Role of Every-Day Cosmetics in Altering the Skin Microbiome: A Study Using Biodiversity
doi.org/10.3390/cosmetics6010002
Is There a Relationship between Transepidermal Water Loss and Microbial Biodiversity on the Skin?
doi.org/10.3390/cosmetics6010018
A New Benchmark to Determine What Healthy Western Skin Looks Like in Terms of Biodiversity Using Standardised Methodology
doi.org/10.3390/cosmetics7040079
There is a skin allergy epidemic sweeping across the western world. Many things in our modern environment are thought to contribute. But how do we find out which ones?
We realised that, despite many attempts to link certain types of bacteria on the skin to health or disease, there was no clear way of measuring skin health.
Our groundbreaking discovery was that the diversity of the microbes on the skin was the only reliable indicator of how healthy it is. This is the same throughout nature, where high biodiversity is seen in healthy ecosystems.
‘Caveman’ skin, untouched by modern civilisation, was very different to “western” skin and had the highest levels of bacterial diversity ever seen. The less exposed communities were to western practices, the higher the skin diversity – clear evidence of an environmental factor in the developed world damaging skin.
In the paper we give benchmark values of diversity against which we can measure skin to determine how healthy it is. This gives us the ability to be able to predict which people are more likely to be prone to skin ailments, and start to test whether synthetic cosmetic ingredients and products are a main cause of the skin allergy epidemic.
Meta Analysis of Skin Microbiome: New Link between Skin Microbiota Diversity and Skin Health with Proposal to Use This as a Future Mechanism to Determine Whether Cosmetic Products Damage the Skin.
doi.org/10.3390/cosmetics4020014
The results from our second paper indicated that the more synthetic ingredients a cosmetics product contains, the more they maintain the damaged western skin microbiome.
Using the skin health measuring mechanism created in Paper 1 and in collaboration with The Medical University of Graz, thirty-two human participants tested three different face washes for their effect on the skin’s microbial diversity, washing twice-a-day for four weeks. The upper volar forearm of the volunteers was swabbed at the beginning, two weeks in and at the end of the four weeks.
One leading ‘natural’ brand with 70% synthetic ingredients, a leading synthetic brand with 75% synthetic ingredients and a 100% natural face wash were used.
The results indicated that the more synthetic ingredients a cosmetics product contains, the more they maintain the damaged western skin microbiome. This paper was the first indications of a link between synthetic ingredients in a cosmetics product and its effect on skin microbiome biodiversity. Future larger studies could lead to the restriction in cosmetics of products proven to harm the skin’s natural environment.
The Role of Every-Day Cosmetics in Altering the Skin Microbiome: A Study Using Biodiversity
doi.org/10.3390/cosmetics6010002
The results indicated that there was not a link between TEWL (transepidermal water loss) and microbial diversity on the skin.
As described in previous work, TEWL (transepidermal water loss) is used as an indicator of skin barrier function and health by scientists at top research institutions. However, it is known to be unreliable because many other factors determine its value, such as humidity, temperature and moisture content of the skin.
In this study we used correlation analysis and the Pearson correlation coefficient to compare values of skin microbial biodiversity with TEWL. In our previous 2017 work, microbial biodiversity was found to currently be the only reliable indicator of skin health. All data was taken from that obtained in Paper 2.
Results showed no linear correlation between microbial biodiversity and TEWL rates or any of the other variables. This suggests the need for researchers to make conclusions about TEWL rates and their meaning with regards to skin health with caution.
Is There a Relationship between Transepidermal Water Loss and Microbial Biodiversity on the Skin?
doi.org/10.3390/cosmetics6010018
Watch the video for a simple summary!
Our 2020 paper finds a benchmark for measuring healthy western skin using biodiversity of the skin microbiome. Our preliminary results also showed adults aged 28–37 have the highest average diversity, and adults aged 48–57 have the lowest average diversity.
The primary objective of this study was to obtain a benchmark value for the microbial diversity found on healthy western skin, using the Chao1 index. This benchmark was used to update our 2017 skin health measuring mechanism. It used 50 human participants from Graz in Austria and at a read depth of 6600 sequences, we found the average Chao1 diversity to be ~180.
Previous work with a larger sample size was unsatisfactory to use as a benchmark because different diversity indices and evaluation methodologies were used. Because of this study, we can transfer other benchmarks of skin microbiome diversity to the methodology used in this work from our 2017 study, such as “unhealthy western skin” and “caveman/perfect skin”. This could help with assessing whether patients need help strengthening their skin.
In future work, we aim to improve our mechanism by obtaining benchmark diversity values from a larger sample size for any age, sex, body site, and area of residence, to which subjects can be compared.
WATCH: Kit explains his 2020 paper in 2 minutes!
A New Benchmark to Determine What Healthy Western Skin Looks Like in Terms of Biodiversity Using Standardised Methodology
doi.org/10.3390/cosmetics7040079
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