Eating a nourishing food and absorbing its nutrients are different steps. Gut and Physiology Syndrome uses that distinction to explain why GAPS pays attention to the digestive system as well as the food on the plate. The gut lining, digestive processes and microbial community each have a role in the explanation.[1]
What Enterocytes Do
Enterocytes are epithelial cells of the intestinal lining. Campbell-McBride describes them completing parts of digestion and absorbing nutrients, then being replaced through ongoing cell renewal. This is the background to her emphasis on the condition of the gut surface.[1]
Villi and microvilli increase the surface available for these processes. Their names describe structures, while enterocytes name cells. Keeping those terms clear makes the book’s gut-wall explanation less abstract.
The Microbial Relationship With the Lining
The book connects gut flora with epithelial renewal and with substances that nourish the cells of the lining. It draws on animal research while developing the GAPS view that the microbial environment affects the wall’s ability to do its work.[1]
Campbell-McBride calls gut flora the digestive system’s housekeeper. That comparison expresses her larger argument about maintaining the environment around the lining. It should not become a promise that every damaged gut follows the same healing timetable.
Digestion and Absorption Are Separate
Digestion breaks food down; absorption brings usable components into the body. The book describes microbial enzymes, acids and other substances contributing to food processing and the availability of nutrients. Its point is that food quality alone does not describe everything happening between the plate and the body’s use of a nutrient.[1]
That does not mean every symptom after food proves malabsorption. Keep the actual symptom, the food, the amount and the preparation together. The explanation gives you a way to follow the process, not a diagnosis from a meal.
Food Form in the GAPS Plan
GAPS changes the form and preparation of food as well as the ingredient list. Intro Stage 1 uses meat stock, soup and simply prepared foods; Full GAPS has a wider range of permitted foods and preparations. The person’s starting point and introduction sequence matter more than trying to make every meal maximally complicated.
A useful record distinguishes the same ingredient in different forms. Our fourth child reacted to raw apples and fresh apple juice, while homemade applesauce did not cause that reaction. That was our observed response, not a rule that everyone will react to apples the same way. Our family story gives the wider context.
Where Supplements Fit
The digestion chapter argues that isolated nutrients do not reproduce the whole process of digesting food. The same book also has chapters on probiotics, digestive enzymes, vitamins and minerals. Those passages should be read together; the food argument does not mean that every supplement is useless.[1]
Our family has used probiotics, digestive enzymes and minerals while following GAPS. A supplement still has a specific purpose and introduction context. It does not replace the meals or make a general article into a personal dose schedule.
A Useful Next Step
Choose meals from the guide for the phase you are following, then note the food form and what changed. The Intro guide and Intro-versus-Full comparison give concrete starting points. For the meal we often returned to, use homemade chicken meat stock.
For a companion to this topic, look for The Stock Pot Course in my course catalog.
Return to the GAPS gut-flora guide for the wider picture and the links to each part of this series.
References
- Campbell-McBride, N. Gut and Physiology Syndrome (2020), “Appropriate digestion and absorption of food,” enterocytes, renewal and nutrient processing, printed pages 37–38; “Nutritional supplements for GAPS people,” probiotics, digestive enzymes and vitamin/mineral sections.


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