Saliva, Taste and Chewing: GAPS Selective Eating Guide

The GAPS books describe several separate influences on selective eating. The 2020 book says processed-food chemicals, protein and zinc deficiency, toxins in the mouth and toxic dental materials can alter taste. The expanded older book adds two details: some stored toxins are excreted through saliva, and some cases involve poor coordination of the muscles used for chewing and swallowing.^[1][2]

These are related parts of the chapter’s account, but they are not one mechanism. Oral flora and saliva concern the environment in the mouth and food perception. Chewing and swallowing concern motor coordination.

The Current Framework for Altered Taste

The 2020 book names four influences that can alter or dull taste:

• Chemicals added to processed foods.
• Nutrient deficiencies, particularly protein and zinc deficiency.
• Toxins in the mouth.
• Dental materials that make the mouth toxic.^[1]

This current account does not make saliva the only explanation for altered taste. It places oral toxicity alongside diet, nutrient status and dental materials.

What the Current Book Says About Oral Flora

The mouth has its own rich microbial community. The 2020 book says roughly 600 to 800 bacterial species have been identified in the oral cavity, with different communities on the teeth, gums, tongue, cheek lining and tonsils. When that community is balanced and diverse, it helps keep those structures healthy.^[1]

Later, the current book connects abnormal oral flora with mouth ulcers, unpleasant taste, breath odor and visible changes to the tongue. It also says dental materials can change the mouth’s environment and encourage pathogenic microbes.^[1] the mouthwash and oral-microbiome guide covers the current oral-flora framework in more detail.

The Older Chapter’s Oral-Toxin Mechanism

The expanded older chapter says abnormal oral flora produces toxins that settle in the mouth lining and alter the function of taste buds, salivary glands and other oral structures. It connects that state with chronic inflammation, unpleasant taste, mouth odor, red or inflamed mouth tissue, spots or ulcers, and a coated tongue.^[2]

The same passage says compounds in raw fruit and vegetables, herbs, raw nuts and seeds, cold-pressed oils and other foods can bind toxins in the mouth as part of elimination. It says this may cause burning, itching or an unpleasant taste and observes that these are foods often refused in the picky-eating pattern the chapter describes.^[2]

What the Older Chapter Says About Saliva

The saliva claim comes from the expanded older picky-eating chapter. It says body secretions are routes for eliminating toxins and names saliva as one example. It then says some stored toxins are excreted through saliva, adding to the toxic load in the mouth and changing the perception of food in both taste and feel.^[2]

The 2020 book does not repeat that exact stored-toxin-through-saliva statement. Its updated taste discussion focuses on toxins already in the mouth, oral flora, processed-food chemicals, nutrient deficiencies and dental materials. It also says saliva contains the same broad bacterial groups found in stool, reinforcing saliva’s place within the oral microbial environment.^[1]

Chewing and Swallowing Are a Separate Factor

The expanded older chapter separately describes cases in autism and other GAPS conditions where toxicity affecting the brain interferes with coordination of normal muscle movements in the mouth, tongue and other structures used for chewing and swallowing.^[2]

In the severe form described there, the person cannot chew or swallow properly, food must be very soft, and vomiting is frequent. The source says this severe presentation is relatively rare, while a milder form affects many children and adults within the group discussed in that chapter.^[2]

At the start of the feeding chapter, the author gives examples including holding food in the mouth and trying to swallow it in one lump. Its later coordination paragraph describes the severe presentation separately. These observations do not provide a texture or sibling-comparison test for deciding what is causing a difficulty.^[2]

How These Factors Fit Selective Eating

The 2020 book gives food preference a wider microbial context. It says the dominant gut microbes influence cravings and describes a common preference for sweet and starchy processed foods when body flora is abnormal.^[1]

Taste changes, the older saliva explanation and chewing or swallowing coordination sit beside the book’s account of gut flora and food preferences. The selective-eating and senses guide brings those factors together. The sensory and speech guide covers the wider sensory discussion.

What the Sources Do and Do Not Say About Feeding

These passages explain why eating may be difficult; they do not provide a table-side test for deciding which mechanism is active during a refusal. The older chapter discusses behavioral feeding methods elsewhere, but the saliva and coordination passages do not say that refusal proves toxin excretion, or that a particular texture response identifies a coordination problem.

For the broader context, use the sensory and speech guide and the selective-eating guide. Difficulty swallowing needs assessment of the actual swallowing process; it should not be managed simply by assuming it is a food preference.^[3]

Bring Observations That Can Be Used

If I were preparing notes about a difficult meal, I would keep the observation plain: the food, how it was prepared, what happened in the mouth and what the person said. “This food burned my mouth” or “the food stayed in the mouth” is more useful than starting with an assumed explanation.

Keep mouth pain, visible sores, taste changes and difficulty moving or swallowing food in separate entries. A dental or swallowing professional can use those details to decide what needs examination. The book’s proposed mechanisms do not replace that assessment.

Frequently Asked Questions

Does the Current Book Say Saliva Is the Main Cause of Altered Taste?

No. The 2020 book names processed-food chemicals, protein and zinc deficiency, toxins in the mouth and dental materials. The stored-toxin-through-saliva statement comes from the expanded older chapter.^[1][2]

Does the Older Chapter Connect Saliva with Texture Perception?

It says toxins excreted through saliva add to the oral toxic load and alter how food is perceived in taste and feel. It does not give examples of particular textures.^[2]

What Does the Source Name in Severe Coordination Cases?

It names an inability to chew and swallow properly, a need for very soft food and frequent vomiting. It says the severe form is uncommon and a milder form affects many within the group discussed.^[2]

Does Food Refusal Identify One of These Mechanisms?

No. The cited passages do not turn an individual refusal into a test for saliva toxicity, oral-flora changes or motor coordination. They present several possible factors within a broader account of selective eating.

Your Next Step

The eating-disorders overview explains the wider chapter. Bring plain observations about mouth comfort, food preparation and chewing or swallowing to the appropriate assessment. My Sensory Kids Pack is listed in the WFLI Shop. A notebook can hold the same observations and questions.

References

1. Campbell-McBride N. Gut and Physiology Syndrome (2020), oral flora, food addictions, taste and sensory development.
2. Campbell-McBride N. Gut and Psychology Syndrome, expanded text represented by the second German edition (2015), “Essenszeit! Oh je!” (“It’s Feeding Time! Oh No!”). English paraphrase.
3. NIDCD. Dysphagia. Swallowing difficulties, clinical assessment and treatment.