What GAPS Says About the Ketogenic Diet and Cancer

Following GAPS does not mean everyone needs to pursue ketosis. Dr. Natasha says most people following GAPS do not need it. Her 2020 book highlights cancer as one situation in which she has found the ketogenic approach useful, while also naming epilepsy and other conditions and acknowledging that it does not help everyone.^[1]

What Physiological Ketosis Means

Ketones are made when the body uses fat for energy. Nutritional ketosis and diabetic ketoacidosis are different states, but a ketone reading alone is not a complete safety or cancer-response assessment. The distinction in the book should not become a promise that a particular meter result makes a diet suitable for every reader.^[1]

Why the Book Discusses Cancer

Dr. Natasha’s rationale is that some cancer cells depend heavily on glucose and may be less able to use alternative fuels. She describes ketosis as depriving those cells of energy. Her accompanying qualification matters: she reports usefulness in many cases, not all. The same passage describes ketogenic treatment for epilepsy as helpful for many people, not everybody.^[1]

The Warburg effect concerns glucose-to-lactate metabolism; it does not establish that every cancer cell has identical fuel requirements or that dietary carbohydrate restriction makes blood glucose disappear. The Warburg article separates that metabolic observation from the book’s fungal interpretation.^[2]

Why No-Plant GAPS Is Not Automatically Ketogenic

The book distinguishes food selection from a measured metabolic state. It describes differences in metabolism and gut flora and explains that protein can contribute to glucose production. Someone eating a No-Plant diet therefore does not necessarily reach ketosis. Nor is there one fat-to-protein ratio that works for every person.^[1]

Dr. Natasha also proposes that glucose produced by gut microbes from other food components can contribute to the difficulty some people have reaching ketosis. That is part of her gut-flora explanation for individual differences, alongside the body’s own conversion of protein to glucose.^[1]

My Ketogenic GAPS versus Full GAPS guide explains the broader variation. The cancer question adds another layer: nutrition must fit the illness, treatment, appetite, digestion and risk of losing weight or muscle.^[3]

The Food Sequence Described in the Book

Dr. Natasha describes first settling into No-Plant GAPS, then gradually shifting protein toward fat. She names coconut oil, ghee and animal fats, with olive oil as an addition; sour cream replaces kefir or yogurt in that description. She keeps meat stock, gelatinous and organ meats and fermented foods in the picture, rather than setting gut health aside for a ketone target.^[1]

There are qualifications within that description. Nuts and oily seeds are conditional on digestive readiness, and she recommends soaking, sprouting or fermenting them to improve digestibility. She selects coconut oil and ghee because, in her explanation, their medium-chain fats need little digestion and absorb quickly. She favors natural foods over manufactured MCT oil. She discusses salt and fluid losses and recommends acidified water in her approach; that recommendation should not be presented as a demonstrated way to treat systemic acidosis. These are the book’s food and preparation choices, not a protein-restriction prescription for someone with cancer.^[1]

Tracking Ketones

The book gives a blood-ketone target of 0.5–3 mmol/L and describes daily blood or breath measurements, with urine testing considered less reliable. That is the author’s ketosis target. It is not a validated threshold showing that a tumor is shrinking, a replacement for imaging or a reason to ignore symptoms.^[1]

A useful question for a dietitian is what, if anything, should be measured for the person’s actual plan. Weight, intake, symptoms and treatment tolerance may be relevant alongside any metabolic measurements. Do not reduce needed nutrition simply to make a meter display a preferred number.^[3]

What Cancer Nutrition Research Can Answer

Clinical studies have examined ketogenic diets alongside standard treatment, including studies of feasibility and tolerance. Those outcomes are valuable, but they differ from showing a survival benefit or proving that a diet replaces treatment. The NCI nutrition summary keeps those questions separate.^[3]

The book’s ketogenic chapter and the official FAQ’s Gerson discussion are also separate source statements. The FAQ says Dr. Natasha does not use the nourishing GAPS Nutritional Protocol to treat cancer; it does not explicitly explain how that answer relates to the ketogenic chapter. The feeding-and-cleansing guide presents that distinction without inventing a withdrawal or a single combined regimen.^[1][4]

Your Next Step

If you want to discuss a ketogenic approach, take the chapter and a clear question to the oncology nutrition team. Ask what the goal would be, what evidence applies to this cancer, how adequate intake would be maintained and what would make the plan unsuitable. Those answers should come before a major change in protein, calories or treatment.

Return to the cancer and GAPS overview for the rest of the reading map. My Ketogenic GAPS Cookbook is listed in the WFLI Shop for kitchen ideas within that GAPS variation. If a ketogenic food plan has been agreed for your situation, a recipe collection can help with meals; the clinical plan still needs its own individual goals and follow-up.

References

1. Campbell-McBride, Natasha. Gut and Physiology Syndrome (2020). GAPS Ketogenic Diet, pp.201–204.
2. Liberti and Locasale. The Warburg Effect: How Does It Benefit Cancer Cells? (2016).
3. NCI. Nutrition in Cancer Care, PDQ. Ketogenic diet and nutrition status.
4. Campbell-McBride, Natasha. Official GAPS FAQs, “Diseases and Symptoms,” question on pancreatic cancer and using GAPS to treat cancer.