If a person eats three meals a day and no snacks, his insulin will be at or near fasting levels for about 18 hours a day. Why is a few less hours a day of elevated insulin with CC diets so important?

Two points here. It’s not just the total number of hours, but the number of consecutive hours of low insulin that may be the key factor. The physiological adaptations that protect animals that are calorically restricted probably don’t happen instantly as soon as insulin goes down. It may take a number of hours for them to rev up. With a CC diet, if your subsidiary meals release only a little insulin, your insulin will be low or relatively low for about 20 hours consecutively. That gives low insulin a lot of time to act on your system.

Another point is that when people scatter meals rich in high-glycemic index carbs throughout the day, this can cause wild swings in blood sugar that trigger hunger and cravings in some people, making it hard for them to control their food intake and keep their weight down. That’s probably why the Heller’s diet works well for people whom they describe as “carb addicted”.

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