digest
Short Summary
Main recommendation: Lower your total daily carbohydrate intake, which Dr. Ken Berry calls the "75 percent solution," and he says this is the most effective way to lower A1C. He advises targeting under 50 to 100 total grams of carbohydrates per day, with Dr. Berry saying under 50 grams could potentially bring A1C into non-diabetic and non-prediabetic ranges for about half of people.
Key Points
- Dr. Ken Berry ranks A1C-lowering approaches by estimated effect: supplements like cinnamon, ginseng, vitamin D, probiotics, aloe vera, chromium, magnesium, and gymnema are about 1%, berberine about 5%, sleep and stress management about 10% each, exercise and prescription medication about 10 to 15%, and carbohydrate reduction about 75%.
- Dr. Berry argues that all carbohydrates break down to sugar, and that excess blood sugar causes glycation of hemoglobin and other tissues, in his view.
- Dr. Berry states that fructose and galactose glycate tissues seven to ten times more than glucose, and that the A1C test does not detect fructose or galactose glycation.
- Dr. Berry claims that fat and animal protein do not raise blood sugar or A1C, so he focuses on carbohydrates rather than dietary fat.
- Dr. Berry notes that fiber can lower blood sugar indirectly, but says many people experience gut problems from high fiber intake.
Details Worth Noting
- Concrete instructions: Download a carb-tracking app such as Chronometer or Carb Manager and log your total carbohydrate grams for two to three weeks to find your daily average.
- Concrete instructions: Reduce your average by about a quarter, for example from 200 grams to 150 grams per day, then recheck. Options for rechecking are an A1C test in about three months, a continuous glucose monitor, or a glucometer checked about 30 minutes after meals, where readings above 200, 250, or 300 suggest the meal had too many carbohydrates.
- Concrete instructions: Remove fruit juice, which Berry says has no meaningful nutrition, and cut bread and jelly in half, replacing margarine with real butter. Replace high-carb foods with higher-protein, higher-healthy-fat foods while eating roughly the same total amount of food, without calorie counting or portion minimizing.
- Concrete instructions: For sleep, determine your personal optimal amount (commonly 6 to 8 hours) and protect that time nightly. For exercise, add 10 to 15 minutes of muscle-building activity daily if you are able.
- Concrete instructions: Consider a good-quality berberine supplement if you choose to take a supplement, and stop spending money on the other supplements mentioned.
- Berry says some people can keep A1C normal at 60 to 75 grams of carbohydrates per day, and that ketogenic or carnivore diets are safe if they are needed to reach the target.
- Berry says prescription medications, when taken as prescribed, lower A1C by about 0.2 to 1 percentage point, and presents this as no better than the lifestyle changes he describes. This is his view, not professional medical advice; discuss medication changes with your doctor.
Bottom Line
Dr. Ken Berry's core message is that reducing carbohydrate intake, especially sugars including fructose and galactose, has far more impact on A1C than supplements or most medications, and tracking your intake is the practical way to start. Health decisions, including medication changes, should be made with a qualified clinician.
