The GAPS books describe nutrition as one influence on gene expression. The inherited DNA sequence remains the same, while the conditions around it influence which genes are active.[1][2]
The expanded earlier Genetics chapter supplies the pregnancy, post-birth, and lifelong gene-expression sequence. The 2020 Gut and Physiology Syndrome book adds a specific skeletal-development epigenetic example and the holobiome and hologenome framework.
When I carried our sixth baby on Full GAPS in 2026, the daily work was cooking and eating the same foods I made for the family. That gives me real experience with the pregnancy food work. I am not presenting that experience as a measured epigenetic outcome.[3]
For the wider pregnancy sequence, begin with Preparing for Pregnancy, Birth, and Breastfeeding on GAPS.
Gene Expression Is Not a New DNA Sequence
A baby inherits a DNA sequence from the parents. In the expanded earlier Genetics chapter, gene expression concerns which inherited genes become active.[1]
The expanded earlier Genetics chapter says maternal diet during pregnancy, the child’s diet after birth, and nutrition throughout life influence which genes are expressed. It does not say food rewrites the underlying DNA sequence.[1]
Pregnancy Nutrition in the Current Book
The 2020 book gives a specific epigenetic example inside its skeletal-development discussion. It connects poor maternal nutrition during pregnancy with the described development of the jaw, pelvis, spine, rib cage, and related bones, then says the damage can reach children, grandchildren, and great-grandchildren.[2]
That is a specific skeletal-development example. It is not a promise that one food switches a named gene on or off or determines every part of a child’s development.
Food After Birth Still Matters
The expanded earlier Genetics chapter says the mother’s diet during pregnancy and the child’s diet after birth influence which genetic predispositions are expressed. It continues that diet affects gene expression throughout life.[1]
Pregnancy is therefore an early part of the sequence rather than the only period when the environment interacts with gene activity.
Diet Is One Part of the Environment
The expanded genetics chapter also names lifestyle, pollution, stress and infection. Its argument is that a predisposition is expressed inside a biological and lived environment, not that diet acts alone.[1]
For the 2020 book’s separate skeletal-development and three-generation example, read How Pregnancy Nutrition Shapes the Jaw, Pelvis, and Spine.
The Holobiome Adds Microbial Inheritance
The 2020 book describes human and microbial inheritance together through the holobiome and hologenome. It says the whole human-and-microbial ecosystem is thought to be passed from parents to the baby during pregnancy and birth.[2]
That makes prenatal environment more than a conversation about human genes. Where Your Baby’s Gut Flora Comes From follows that part of the current framework.
What Families Can and Cannot Control
Parents do not choose the inherited DNA sequence. The expanded earlier Genetics chapter names diet, lifestyle, pollution, stress, and infection as environmental influences.[1] The 2020 book separately adds the holobiome and hologenome inheritance framework.[2]
Changing those influences does not guarantee that a predisposition will never become a condition. The practical point is that inheritance is not the only input.
Frequently Asked Questions
Does Food Change the DNA Sequence?
No. The cited sections discuss gene expression, meaning which genes are active.
Does Pregnancy Determine Every Later Outcome?
No. The books continue the diet-and-environment discussion after birth and throughout life.
Does GAPS Promise That Diet Prevents Every Predisposition?
No. The framework argues that diet and environment influence expression; it does not provide a universal prevention guarantee.
Prepare the Environment You Can Shape
Preparing for Baby: A GAPS Preconception Plan for Both Parents brings food, household preparation, both-parent work, and the pregnancy environment into one sequence.
Explore the preparing-for-baby course.
References
- Campbell-McBride, N. Gut and Psychology Syndrome, expanded English edition (2013), represented by the expanded second German edition (2015), Genetics chapter, pp. 387–388: predisposition, maternal and later diet, lifelong gene expression, and the named environmental influences.
- Campbell-McBride, N. Gut and Physiology Syndrome (2020), “Gut Flora,” subsection “Pleomorphism,” for the holobiome and hologenome framework; “Bones and Teeth” for the maternal-nutrition skeletal-development epigenetic example.
- Garnica, E. Personal family account and pregnancy timeline: sixth pregnancy carried on Full GAPS in 2026 and eating the same meals prepared for the family.
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