Is occasional fasting & intermittent fasting okay? | The Paleo Diet®
noun_Search_345985 Created with Sketch.

Try The Paleo Diet®!

Learn more. Get recipes & meal plans. See the science.

A Question About Occasional Fasting

By Maelán Fontes, M.S.
February 9, 2010
A Question About Occasional Fasting image

Hello,

You may have covered this issue already, I have not read that much of your work.

I thought I would point out though that Paleo humans likely went through periods of enforced occasional fasting due to a lack of game or a temporary lack of success in hunting. In fact, there were likely alternating cycles of gorging and fasting. This alternating cycle would change the data on the Paleo diet as modern humans are not likely to be undergoing the fasting phase.

It seems like doing a study using the climate record might help as Paleo man may not have migrated as much as the animals that they hunted.

Have you already covered this?

Just another nutrition student,

Bob

Maelán Fontes' Response:

Dear Bob,

We agree in that hunter-gatherers would probably have been forced to observe periods of intermittent fasting.

In our archive you can find a published issue of our newsletter (Vol. 1; Issue 3) where Dr. Cordain reports that hunter-gatherers usually ate a single meal in the evening and probably breakfast using leftovers from the night before. This makes sense as they spent the day engaged in foraging and hunting activities and returned to their camps in the sunset. Some of the beneficial effects of intermittent fasting are likely due to caloric restriction, a well as known interventions that increase health in animals and humans, and lifespan in animals such as hamsters, mice, rats, fish, insects and worms.

A feast-famine, exercise-rest cycle has been postulated as a healthful lifestyle similar to that of human beings in the paleolithic. Famine and exercise (simultaneously) decrease muscle glycogen and triglycerides stores increasing AMPK and GLUT4 expression. These two proteins are involved in glucose and triglycerides homeostasis, leading to an efficient storage of energy and increased physical performance. If hunting is successful, a replenishment of glycogen and triglycerides is produced. This is followed by a relative period of rest. This efficient storage of energy increases the probabilities of surviving during another famine/exercise period.1

This should be a healthy way to improve health and physical performance from an evolutionary perspective.

1. Chakravarthy, M. V., Booth, F. W. Eating, exercise, and "thrifty" genotypes: connecting the dots toward an evolutionary understanding of modern chronic diseases. J Appl Physiol, 96 (1); 3-10.

I hope this helps.

Cordially,
Maelán Fontes MS Ph.D. candidate in Medical Sciences at Lund University, Sweden

Even More Articles For You

Going Beyond the “Beyond Burger”: Do you really know what’s behind the craze and the glittery curtain?
The Beyond Meat burger is all the craze right now tasting like a real meat burger. But is it a Paleo option and most importantly is it healthy?
By Bill Manci
Will Paleo Help My Child's Keratosis Pilaris
Can the paleo diet help with your child's keratosis pilaris? Read our article to learn more. The Paleo Diet® offers the best paleo recipes & news.
By Loren Cordain, Ph.D.
4 Outdoor Workouts to Skip the Gym Without the Guilt
Wherever your fitness leads you this summer, consider skipping the gym and getting outside. Reap the benefits and give these great outdoor workouts a try.
By Stephanie Vuolo
Paleo Leadership
 
Trevor Connor
Trevor Connor

Dr. Loren Cordain’s final graduate student, Trevor Connor, M.S., brings more than a decade of nutrition and physiology expertise to spearhead the new Paleo Diet team.

Mark J Smith
Dr. Mark Smith

One of the original members of the Paleo movement, Mark J. Smith, Ph.D., has spent nearly 30 years advocating for the benefits of Paleo nutrition.

Nell Stephenson
Nell Stephenson

Ironman athlete, mom, author, and nutrition blogger Nell Stephenson has been an influential member of the Paleo movement for over a decade.

Loren Cordain
Dr. Loren Cordain

As a professor at Colorado State University, Dr. Loren Cordain developed The Paleo Diet® through decades of research and collaboration with fellow scientists around the world.