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Short Summary
Main recommendation: Dr. Eric Westman says keto cycling (cyclical keto), which alternates between fat-burning ketosis and carbohydrate-burning phases, is not a useful approach for people trying to treat diabetes, obesity, or other metabolic problems; instead, he recommends staying in fat-burning ketosis consistently until the metabolic problem is resolved. He notes that cycling is used by some bodybuilders and elite athletes as an advanced performance technique, which adds confusion for people seeking a therapeutic keto diet.
Key Points
- Keto cycling means moving in and out of fat-burning ketosis by alternating low-carb and higher-carb eating, which the speaker says disrupts fat burning.
- Westman frames fuel choice as a matter of diet: eating carbohydrates burns carbs, while restricting them lets the body burn stored body fat.
- Metabolic flexibility varies: children switch fuel sources easily, while people with long-term weight or diabetes problems may take much longer to return to fat burning.
- Full return to fat burning after eating carbs can take about three days in a normal person, and up to two weeks in some people with lifelong weight problems.
- Westman says a strict keto diet must be followed every day, not one meal a day or six days a week, but hunger typically fades after a day or two.
- He says ketones have anti-inflammatory properties and that new science suggests staying in fat burning may even be healthy long-term, though he presents this as an open question.
Details Worth Noting
- Concrete instructions: Follow a keto diet strictly every day (seven days a week) by restricting carbohydrates and eating real, whole foods, and stay in fat burning until the metabolic problem (such as diabetes, obesity, or high blood pressure) is resolved, rather than cycling in and out.
- Concrete instructions: Westman describes three phases based on total daily carbohydrates: Phase one is 0 to 20 grams (therapeutic keto, which he recommends as the starting point for fixing metabolic problems), Phase two is 20 to 50 grams, and Phase three is 50 to 150 grams.
- Concrete instructions: Choose a starting phase using the book's guide; lower-carb phases are for metabolic repair, while people who are very active or genetically more carb-tolerant may use higher-carb phases, with an emphasis on clean, minimally processed foods rather than sugary or refined starches.
- Westman notes that a low-glycemic diet roughly corresponds to phase two, and perhaps part of phase three, and that he does not advocate moving between phases as a form of cycling.
- Keto cycling was described as used by some bodybuilders or elite athletes for performance, and it has not been studied as a treatment for diabetes or obesity.
- The speaker notes that the ketogenic diet used for children with epilepsy and the cyclic ketogenic diet are among the many keto variants that confuse online searches.
Bottom Line
For people with metabolic conditions, Westman's position is that the goal is to get into and stay in fat-burning ketosis through strict, daily carb restriction, not to alternate between fat burning and carb burning.
