Dr. Boz [Annette Bosworth, MD] - Beginning Keto Diet: Part 1- The first 3 days

Short Summary

Main recommendation: Dr. Bosworth explains the first two phases of the body's shift from burning glucose to burning fat on a ketogenic diet, and advises eating low-carbohydrate, high-fat foods (about 80% fat) that do not overfill the liver, avoiding artificial sweeteners, and checking your morning fasting blood sugar to judge whether your liver has emptied. The video is Part 1 of a three-part series covering five phases, with phases three through five deferred to later videos.

Key Points

• Phase one (roughly 0 to 4 hours after eating): the body runs on glucose from food, and the blood sugar burn rate falls from a high of around 400 units per hour to under 25 grams per hour by the four-hour mark; eating again restarts phase one.
• Phase two begins once blood glucose is used up; the body draws on glycogen, a stored sugar in the liver, which is emptied during this phase.
• The liver can grow extra cells over time in response to long-term excess carbohydrate or alcohol intake, which is why people with large, fatty livers may take longer to empty their liver stores.
• Morning fasting blood sugar serves as a marker: 55 to 85 suggests the liver emptied overnight, while readings around 100 to 120 suggest it did not, and a reading near 120 first thing in the morning is how diabetes is diagnosed, per the speaker.
• Eating carbohydrates, even around 30 grams a day, can cause an overproduction of insulin in people with an overstuffed liver, slowing progress.

Details Worth Noting

• Concrete instructions:
  • Eat foods that do not fill the liver; the speaker says a ketogenic diet is about 80% fat.
  • Avoid carbohydrates, including small amounts (about 30 grams a day), while the liver is still emptying.
  • Avoid artificial sweeteners, which the speaker says can spike blood sugar and insulin and block fat loss.
  • Check your fasting blood sugar each morning. Between 55 and 85 indicates the liver emptied overnight; around 100 or higher indicates it did not.
  • Do not snack within a few hours of eating, since a snack at about two hours restarts phase one.
• The speaker notes that some people with very large livers (for example, those 40 to 100 pounds overweight for years) may need two weeks of fasting before morning sugar drops below 100, and that many quit during this stretch.
• The speaker states that the liver enlargement he sees in patients is typically linked to long-term carbohydrate intake rather than alcohol.
• The speaker describes these claims from his clinical experience and from a 40-day fasting study; they are presented as his own explanation and not as professional medical advice.

Bottom Line

Stabilizing the overnight fast and getting morning blood sugar into the 55 to 85 range is the key checkpoint in this video, with liver size and carbohydrate and sweetener intake determining how long the transition takes.