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Short Summary
Main recommendation: Dr. Eric Westman argues that a ketogenic diet does not require dietary glucose, because the liver and kidney can produce all the glucose the body needs, and that the "we must have sugar or we will die" claim is fear-mongering. He reacts to a video by carnivore diet promoter Dr. Shawn Baker, who responds to health influencer Dr. Joseph Mercola's reported move away from ketogenic diets. Westman says the debate is still evolving and that different diets may suit different metabolic situations.
Key Points
- Baker, an orthopedic surgeon, cites a 2004 article (not 'Fat for Fuel,' which he says argued glucose is the ideal fuel) and says he has had no significant sugar for about 10 years, citing a study showing the brain can use ketones while the liver makes glucose.
- Westman agrees that some cells need glucose (red and white blood cells, a subset of brain glial cells, and the renal medulla of the kidney), but says the body makes it internally rather than requiring dietary intake.
- Baker cites a 2021 Journal of Clinical Medicine study reporting that very low-carbohydrate ketogenic diets reduced stress markers and salivary cortisol, and argues that mild cortisol elevation is not particularly harmful.
- Baker cites a 2022 International Journal of Molecular Sciences article describing Alzheimer's disease as "type 3 diabetes," and a 2020 article in the same journal on ketone bodies supporting brain metabolism in neurodegenerative diseases.
- Westman argues that glucose is not a better fuel or less oxidative, and that carnivore and keto research is still in its infancy.
Details Worth Noting
- Practical advice given is limited to: skip carbohydrates or eat nothing for two or three days to enter nutritional ketosis (as described by Westman), and look at the underlying data rather than only the interpretation, and be cautious about relying on single blood tests, viewing health as a combination of many tests.
- Dr. Baker (not Westman) describes Mercola's claim that muscles can use ketones and produce even more energy than glucose; Westman separately notes the clip contained little of Mercola's own speech.
- Westman says reality TV contestants can survive 21 days without eating, which he uses to frame the body's fat-burning system as normally healthy rather than an emergency mode.
- Baker's 2018 Cell Metabolism citation concerns animal studies showing ketogenic diets extended longevity and healthspan.
- Baker states that sugar causes cravings and addiction-like behavior for many people, but Westman argues tolerance varies between individuals.
Bottom Line
The clip is a back-and-forth on whether dietary glucose is essential; both speakers agree the body produces glucose internally, while the broader evidence on carnivore and keto diets remains preliminary and interpreted differently by each side.
