January Shred Rule #4: Intermittent Fasting

Missed the Introduction to the January Shred? Click HERE.

What is intermittent fasting?

Before I give you my explanation, please go HERE and watch a short video where Dr. Mercola explains some of the benefits of intermittent fasting. You might read some of the article as well.

Intermittent fasting (IF) in layman’s terms is basically having a period of time each day where you don’t eat. The concept is involves forcing the body to burn fat stores for energy during the fasted period of the day. To understand how this is possible, you first need a very basic understanding of how the body burns calories for energy. The body will always prefer burning carbohydrates first, then fats, and then proteins. Carbohydrates quickly break down into glycogen which your body will always burn before it digs into fat reserves for energy. If there is no available glycogen, your body will convert fat stores into energy…which is what we want! However, at some point if there is still no available glycogen, your body may begin to dig into intramuscular fat and catabolize your muscle (protein). This is what we don’t want and one of the reasons we don't want to have an extremely long fasted period (20+ hours).

Now that you understand the priority of your body’s energy usage, you can understand that depleting glycogen reserves will cause your body to burn more fat for energy. Through much research, case studies, and personal tweaking, a nutritional consultant and personal trainer named Martin Berkhan developed the “LeanGains” program. Berkhan, who operates a blog (www.leangains.com), has essentially written the book on how to effectively use I.F. for fat loss while gaining muscle. He has found that a fasting window of 16 hours for men, and 14 hours for women is the most effective way to burn fat while maintaining muscle. Sure you can push the window out further and go for 18 to 20 hours fasted, but that becomes very hard to do practically for long periods of time.

This is going to be a massive over-simplification, but right after you eat, your body stops burning fat. It doesn't need to burn fat for energy because it has energy available through the absorption of carbohydrates. A few hours after eating, your body might begin to burn a very, very small percentage of fat, but still almost all carbohydrate. After sleeping for 8 hours, you are burning more fat, for ease of explanation, let's say 50/50. After 16 hours of fasting, you are burning mostly fat. This is why 14-16 hours is the sweet spot.

How I suggest you start intermittent fasting

Unlike Dr. Mercola, I think you can jump into IF pretty quickly and get to your 14 hour or 16 hour fasting window in a day or two. Start off with a 12 hour fast on the first day, then as you assess your success move to 14 and then 15 or 16 hours. You can do this by setting a cutoff time for food in the evening. I suggest 8pm. If you start with a 12 hour fast, you can eat the next morning starting at 8am. My intermittent fasting schedule is from 8pm until 12pm noon the next day (16 hours).

How you know if you are performing Rule #4 successfully

During the first week, as long as you have a 12 to 16 hour fasting window for men and a 12-14 hour fasting window for women, you are successfully completing rule #4. However, after the first week, for men you'll need to have a 16 hour fasting window, and 14-15 hour fasting window for women. Remember, during the fasting window, you cannot consume any calories. The exception is a little creamer in coffee or calories contained in pre-workout mixes. Regardless, these exceptions still need to be less than 75 calories. The idea is to burn fat everyday during your fasting window.

Helpful Tip

Drink LOTS of water during the fasting window as this will help you deal with the hunger you are likely to experience. Don't worry, you aren't going to die if your stomach growls a little. After a few days the hunger begins to be much easier to deal with...and eventually you won't even notice it.