Jason Fung is a well-known expert on nutrition, and is also the author of several books including the best sellers "The Obesity Code" and "The Complete Guide to Fasting: Heal Your Body Through Intermittent, Alternate-Day, and Extended Fasting."

He talks with the Commander today about our misguided understandings of nutrition and gives us insights into the importance of timing and fasting in general.

Learn how: There are eating "windows" where you should be eating, and times when you shouldn't be. You can either be storing fat, or burning it. Not both at the same time.

Only the brain uses ketones-all the other muscles can use fat directly Dr. Fung's approach is actually very straight-forward. What to eat. When to eat.