Greetings, skin microbiome enthusiasts and readers. In exploring the origins and specifics of the human-to-microbial cell ratio in the human body, I encountered several intriguing and contradictory studies. Since 2013, the validity of the 1:10 ratio has been under scrutiny by some researchers. Rather than delving into its origins, I reviewed a 2016 journal article titled “Revised Estimates for the Number of Human and Bacteria Cells in the Body,” which posits a roughly 1:1 ratio, challenging the previous 1:10 claim. However, this leaves me somewhat perplexed. While the authors’ skepticism and examination of outdated data are commendable, the human microbiome consists of more than just bacteria; it includes viruses, fungi, and other microbial entities. A 2013 report even suggested that viruses likely surpass bacteria in terms of numbers within the human body. Hence, neither a 1:10 nor a 1:1 ratio may be entirely accurate. Nonetheless, it is encouraging to see scientists question established beliefs and employ modern tools and technologies to deepen our understanding of the diversity and abundance of cells in our bodies. If you are aware of any scientifically robust publications from after 2016, please share them in the comments so we can all benefit from the knowledge.

Until the next blog, cheers!