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Fasting
Fasting will happen naturally as you progress through your journey. Children should never fast. You
should not fast until you are fat-adapted, which could take from 3 to 8 weeks. Fasting has been proven
to drastically reduce insulin levels and permanently improve insulin sensitivity. It is also a great therapy
(once fat-adapted) for losing weight and increasing stamina, mental acuity, and physical performance.
Think of the ketogenic diet as fasting-lite. Fasting does what the ketogenic diet does, just faster. When
you fast, after a couple days your hunger goes completely away. Your body uses stored body fat for fuel,
you get a shot of adrenaline. This is an evolutionary advantage – when there’s no food, your body gives
you energy to go run down a wooly mammoth. You also get a surge of Human Growth Hormone, which
protects your muscles from being catabolized (used for fuel).
When people I know fast, they can do super-human feats of endurance and strength. They can go on a
50 mile bike ride, or lift weights for hours on end with no break. Body fat is a fantastic fuel because you
never have to replenish it.
After 3 or 4 days fasted your metabolism starts to slow down. This also makes sense from an
evolutionary point of view. Your body “gets it” that there’s really no food around, and begins to
conserve energy… perhaps in anticipation of a famine. It still draws down body fat, but doesn’t burn as
much.
Intermittent Fasting
Intermittent Fasting is simply fasting for shorter periods of time in between times of feeding. You can go
for 18 hours, 24 hours, 2 days, alternate days, etc. The more time you go without food, the lower your
insulin will go. Most people start their foray into fasting with a 1 day fast, starting and ending at the
same time of day/night. Intermittent fasting is a great way to bust through a plateau.
Extended Fasting
An extended fast typically goes 5 days or longer. Many of us in the ketogenic forum have done 7 day
fasts. Tom Seest, one of our admins, just finished a 20 day fast. He called it a lazy fast, because he had a
few shrimp every day (protein) but no other nutrients. He also cycled his butt off. Tom has gone from
over 500 pounds to 200 something in just 2 years.
The world record for fasting was held by a 27-year-
old Scottish man, Angus Barbieri, who in 1966 fasted
for 382 days straight. All he took was a daily
multivitamin and yeast. He was under a doctor’s
supervision the entire time, and lost 293 pounds!
The definitive book on fasting is called “The Obesity
Code” by Dr. Jason Fung of Toronto, ON. He has
been successfully treating over 1000 patients with
diabetes using fasting as a therapy.
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