By Russell Browne (Dip. Adv. Nut.) · Specialist in Genetic Nutrition & Methylation Protocols

Gut Genes – The Genetic Advantage is a plain-English guide to how your genes relate to gut health — the microbiome, how the body handles histamine, and how certain nutrients are processed. It’s an approachable companion to your variant report for anyone curious about the genetics behind digestion and gut wellbeing.

What the book covers

Several common gene variants are studied in relation to the gut. This book walks through, in everyday language, genes such as FUT2 (which influences “secretor status,” the gut microbiome, and vitamin B12) and DAO (which helps break down histamine from food), along with how these connect to digestion, food tolerance, and nutrient handling. It explains what the research does and doesn’t support, so you can understand your gut-related variants without overreading them.

Who it’s for

It’s written for readers who want to understand the genetic side of gut health — microbiome, histamine sensitivity, nutrient absorption — in plain language, and who want a grounded overview before exploring individual genes. If you’ve read our FUT2 or DAO pages and want the wider picture, this book brings it together.

A note on how to use it

This book is an educational resource, not a diagnosis or a treatment plan. Common gene variants shift relative likelihoods rather than determining your health, and gut health is shaped by diet, environment and many other factors beyond any single gene. The most useful approach is to build understanding and bring anything meaningful — including any dietary changes — to a qualified practitioner who can consider your individual picture. The book pairs naturally with a variant report: the report shows what you carry, and the book helps you make sense of it.

Explore the topic on our site

Prefer to browse first? See FUT2, DAO, and the wider list under Genes & Symptoms.

Get your own variant report

Your existing 23andMe or AncestryDNA raw data file already contains these markers — no new test needed. Pair the book with your own results:

Order or view your report · Find a practitioner

About the Author

Russell Browne (Dip. Adv. Nut.)
Specialist in Genetic Nutrition & Methylation Protocols

Russell Browne is a qualified practitioner of Advanced Nutrition, Advanced Herbalism, and Homeopathy, with a specialized clinical focus on genetic nutrition, methylation pathways, and detoxification. With years of dedicated clinical experience helping patients decode complex chronic health issues, Russell is the author of the Genetic Advantage series — ten books on genetic wellness — and is committed to bridging the gap between complex genetic data and practical, root-cause clinical care.

Read Russell’s Full Professional Profile & Clinical Credentials
View the full Genetic Advantage book series