Alanna Collen

Alanna Collen is a British science writer and former biologist who specializes in microbiology and human health. She earned a PhD in evolutionary biology from University College London and conducted postdoctoral research at Harvard University before transitioning to science communication. Collen focuses on the relationship between microbes and human health, particularly the role of gut bacteria in disease and wellness. Her work examines how modern lifestyles and medical practices affect the trillions of microorganisms that live in and on the human body. She writes for both academic and popular audiences, translating complex scientific research into accessible explanations. Her writing covers topics including antibiotic resistance, autoimmune diseases, and the connection between microbial diversity and health outcomes. Collen's approach combines rigorous scientific research with clear explanations of how microbiological discoveries impact daily life and medical practice.

Readers respond positively to Collen's ability to explain complex microbiology concepts without oversimplifying the science. Many reviewers note that "10% Human" changed their understanding of gut health and the role bacteria play in human biology. Readers appreciate her use of personal anecdotes and case studies to illustrate scientific points. The book receives praise for connecting diverse health conditions to microbiome research, with readers finding the links between gut bacteria and conditions like allergies, obesity, and mental health compelling. Many report changing their diet and lifestyle habits after reading her work. Some readers criticize the book for making claims that extend beyond current scientific evidence. Critics note that certain recommendations about probiotics and dietary changes lack sufficient research support. A few reviewers find the writing occasionally repetitive and wish for more practical guidance on implementing the health strategies discussed. Several readers express frustration with what they perceive as an anti-antibiotic stance that may discourage necessary medical treatment.