digest
Short Summary
Main recommendation: Use time-restricted eating (extending your nightly fast) and a low-carbohydrate diet together to improve diabetes, which Dr. Ken Berry says are the two most powerful tools he has seen as a doctor. Dr. Berry says both are supported by controlled human research, and that they work for both type 1 and type 2 diabetes.
Key Points
- The two tools named in the title are time-restricted eating (also called fasting or intermittent fasting) and a low-carbohydrate diet (also called ketogenic eating).
- Dr. Berry says time-restricted eating can lower blood sugar, hemoglobin A1c, and triglycerides, reduce belly fat, and improve other metabolic markers.
- He says a low-carb diet can drastically improve blood sugar, A1c, triglycerides, and other markers, and cites a two-year Virta Health study in which diabetics came off multiple diabetes medications.
- He argues that both tools are preferable to pills or injections alone, which he says doctors usually focus on, and to supplements or cleanses, which he says rarely work.
Details Worth Noting
- Concrete instructions: For time-restricted eating, start by stopping eating one hour before bedtime and waiting one hour after waking before breakfast, sipping only water (sparkling or still), unsweetened tea, or black coffee during those windows. This gives a 10-hour fasting window. After about a week, add one hour on each side for a 12-hour fast, then add another hour for a 14-hour fast (10-hour eating window).
- Concrete instructions: For a low-carb diet, either download an app such as Chronometer, track total carbohydrates for a few days to find your baseline, then cut that amount in half; or pick a set daily carb target such as 100 grams (his example, down from 250 grams). Replace the carbohydrates with healthy protein and healthy fat, without cutting portion sizes, and eat until comfortably full. Some people get even better results at 50 grams or less per day.
- Dr. Berry says high-fat, high-protein foods keep you fuller longer, which he says makes time-restricted eating easier to sustain.
- He points to a Cell Metabolism article (linked in the show notes) for time-restricted eating research and a Virta Health study for low-carb research.
- These are the speaker's claims and recommendations, not professional medical advice; he advises discussing changes with your own doctor, especially if you take diabetes medications, since a low-carb diet may reduce the need for them.
Bottom Line
Combining a longer nightly fast with fewer carbohydrates and more protein and healthy fat is presented as a practical, research-backed way to improve diabetes control without starving yourself, and it should be checked with your healthcare provider.
