I’ve received some questions and requests regarding the use of short periods of fasting once or twice a week. Before I elaborate I want to make one thing clear. I did not come up with this concept, I learned about it from Brad Pilon and then I did my own research and tried it out myself.
I’ve tried several diets in the past that are built around the concept of short daily fasting. I tried the Animal Diet back in 1997 where you only had one meal a day after your workout and an apple before your workouts (much like the Warrior Diet and other copy-cats thereafter). The problem with only eating one large meal a day is that these meals need to be very nutritious to cover all the bases. And if you’re like most people in today’s modern society and have a lack of stomach acid (betaine HCL) or digestive enzymes (due to poor eating habits and stress), malnutrition could be a factor within weeks. This is why I normally prefer two to three meals a day when working with clients and up to four or five if they carry a lot of muscle mass. You know that they will get and absorb the nutrients that they need.
Another important thing with a lower meal frequency compared to the traditional and ridiculous 6 to 8 meals a day is that you avoid high and constant blood amino acid levels which actually lead to a decrease in protein synthesis. You want your AA levels to drop to roughly about baseline before raising them again and stimulating protein synthesis. That however, is another story (and was covered in my books and some articles a couple of years ago).
With that said, this fasting concept is only used once or twice a week and only for about 24 to 28 hours at a time (I think Brad Pilon prefers 24h because of the simplicity). As an example, you could start your fast at 6 PM, sleep through the “worst of it”, and resume eating at 6 or 8 PM the following day. Between these short fasts (during the remaining days of the week) you simply follow your regular diet or eat as you would normally do.
I prefer to start my fast at Saturday evening at 6.00 PM and resume eating at Sunday evening about 9 or 10 PM with 6 grams of leucine (to turn on protein synthesis) followed by a single meal based on slow digested protein, fruits, berries and some healthy fats. Out of convenience it’s usually a blended smoothie. Then I hit the bed and resume may normal eating on Monday morning with three meals a day and one or two mini shakes of leucine and a protein hydrolysate or amino acids.
The best thing about this approach is that you receive the health- and hormonal benefits of fasting while you simultaneously shed at least 2000 to 2500 kcal or more of your weekly energy intake. This, in turn, lets you either lose fat without lowering your energy intake or give you room for a higher nutrient intake (especially around workouts) if you’re trying to build muscle.
Fasting short-term will for example decrease insulin levels (and increase insulin sensitivity), increase fat oxidation, increase growth hormone levels, increase uncoupling protein 3 mRNA and increase glucagon levels. And no, you’re not likely to lose muscle mass during such a short period of fasting, not even if you’re a really big guy.
In the past I used to have a low protein day each week to prevent my body from adapting to a high protein diet, which it does by increasing protein oxidation (wasting protein). Nowadays I take one or two short 24 to 28 hours fasts each week instead. If I’m on a diet, I usually cycle my nutrient intake by keeping it high on the days I lift in the gym (extra carbs and protein pre-workout and extra protein during the workout). On off-days I usually keep it low. Now however, I’ll do my fasting on two of my off-days. If I’m on the other hand is trying to gain muscle mass, I’ll fast once a week on one of my off-days. This allows me to eat even more around my workouts than I usually do while I still benefit from the health improvements from fasting. It’s kind of a win-win.
I’ll write more about my personal experiences and my experiences with my clients later on. In the meantime, if you’re interested in this concept, check out Brad Pilon’s website and his book Eat-Stop-Eat.
