The GAPS book describes nutritional needs as changing with activity, sleep, stress, season and the body’s current work. One part of that explanation is the balance between the sympathetic and parasympathetic branches of the autonomic nervous system. Dr. Natasha Campbell-McBride discusses these as changing states, separate from the metabolic types described elsewhere in the chapter.[1]
Two Branches of the Autonomic Nervous System
The autonomic nervous system manages functions such as heartbeat, circulation and digestion. The book describes its two branches as generally working in opposition while contributing to a complex balance. Its food discussion is about that shifting balance, rather than assigning a permanent nervous-system label to a person.[1]
Why the Balance Can Change
The chapter names the daily activity-and-sleep cycle, season, weather, stress, infection, feeding and cleansing, occupation and emotions. It says the balance may shift several times in a day, over a few days or with the season, and may differ across ages and sexes. These are the factors it uses to explain why a fixed food ratio cannot describe every meal.[1]
That is a different question from inherited constitution. The metabolic-typing guide explains Protein, Carbo and Mixed patterns and the limits the author places on those categories. Here, the useful distinction is that even a correctly identified type does not describe everything happening in the body today.
How the Book Connects State and Food
Dr. Natasha gives the two branches different nutritional associations. Her wording is qualified: the parasympathetic system generally favors meat and fat, while the sympathetic system is thought to need more carbohydrate. The passage does not give a daily percentage or a symptom score for choosing a menu.[1]
| Branch | The Book’s Food Association |
|---|---|
| Parasympathetic | Generally associated with meat and fat. |
| Sympathetic | Thought to need more carbohydrate. |
The later Intro passage gives a separate example of a person under stress wanting more salt and fat. Taken together, these passages describe several influences on food needs. They do not establish a rule that every stressful week calls for more carbohydrate. My Intro customization guide explains the salt-and-fat example.[4]
The Acid–Alkaline Discussion
The chapter also questions fixed labels such as “alkalizing apple” and “acidifying meat.” In the author’s account, food effects depend on factors including autonomic activity, energy production, hormones, respiration and kidney function. Her illustration is that an apple, usually labeled alkalizing, can make the body more acid under some conditions, while meat, usually labeled acidifying, can make it more alkaline. This is her explanation of why fixed labels do not describe every response.[2]
For meal planning, her answer returns to the same food signals: desire, smell, taste and satisfaction. The passage gives an explanation of individual food choice, not a home pH target or a way to measure blood chemistry from appetite.[3]
Using the Idea at the Table
Start with foods permitted in your current GAPS approach and stage. Notice which of those foods appeal, how they taste and whether the meal leaves you satisfied. A change in preference is something you can observe without naming which autonomic branch is dominant.[3]
In my house, the daily pot of meat stock varies with budget, time and what is available. That practical starting point matters when I read about individual proportions. A familiar stock meal can contain the permitted meat and vegetables, while different people choose different amounts. The book uses that kind of meal to explain personal food balance.[4]
Your Next Step
Use the next meal to notice a preference and its result, rather than trying to diagnose a nervous-system state. The food-desire guide and satisfaction-after-eating guide explain those observations. My Weekly Kitchen Rhythm Planner is listed in the WFLI Shop for organizing the cooking around ordinary family life.
References
- Campbell-McBride, N. Gut and Physiology Syndrome (2020), “One Man’s Meat Is Another Man’s Poison,” changing autonomic states and their nutritional associations.
- Campbell-McBride, N. Gut and Physiology Syndrome (2020), “One Man’s Meat Is Another Man’s Poison,” acid–alkaline discussion.
- Campbell-McBride, N. Gut and Physiology Syndrome (2020), food senses and “How Do We Apply This Wisdom While on the GAPS Diet?”
- Campbell-McBride, N. Gut and Physiology Syndrome (2020), “How Do We Apply This Wisdom While on the GAPS Diet?”, stress, salt, fat and stock-meal proportions.
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