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Intermittent Fasting for Dogs and Humans: Live a Healthier Life Together

Intermittent Fasting for Dogs and Humans: Live a Healthier Life Together

There are dozens and dozens of animal studies and human clinical trials that show intermittent fasting can be a positive health benefit to both you and your dog.

The digestive system is a complex system. It has the power to not only get rid of toxins – including parasites, viruses, bacteria and chemical toxins – but it remembers those toxins next time they come into the body and even knows to dispel them. HOWEVER, when our bodies get food every day, the system never has a chance to "catch up" and reset. It is constantly working to remove the bad stuff from the good stuff. This can cause issues in the body, including miscommunication where the body mistakes its own cells for invaders and begins to attack the body’s own healthy cells and tissues. This is an autoimmune disorder and can present itself in a variety of outward health issues. In addition, when the digestive system is constantly working to digest new food, build-up of harmful toxins, excess fat and other harmful bacteria can occur.

In dogs, these contribute to these common dog ailments:

  • Arthritis (especially linked to the auto-immune disorder)
  • Allergies (especially linked to the auto-immune disorder)
  • Liver disease
  • Cancer
  • Yeast overgrowth
  • Chronic Upset stomach, including diarrhea

In Humans, we see similar ailments including:

  • Arthritis (especially linked to the auto-immune disorder)
  • Allergies (especially linked to the auto-immune disorder)
  • Liver disease
  • Cancer
  • Diabetes
  • Irritable Bowel Syndrome (IBS)
Benefits to Your Dog

As you can see from above, a dog whose digestive system is not running at peak performance can have a lot of chronic issues. Fasting helps by increasing anti-bacterial function, immunity (through increased immunoglobulin levels), cancer-fighting (through increased killer cell activity, which targets tumour and virus-infected cells), and fight inflammation (through increased monocytes, which ingest infectious agents).

During fasting, stored fat is used as well, helping getting rid of any stubborn weight your dog may have. And waste products that the liver was not able to process and were therefore stored in the fat are finally released – this can include pesticides from vaccines and flea control!

In “A longitudinal study of the influence of lifetime food restriction on development of osteoarthritis in the canine elbow” published in 2009, clinical tests on Labrador Retrievers showed that restricting calories to 70 percent of the diet for a fast decreased arthritis in joints.

And, perhaps most important to all dog owners, fasting has shown in several studies on several different species, including canine, to lengthen lifespan. One study done by Mark Mattson and his team at the United States National Institute on Aging found that mice, when fed nothing every other day, had a “much longer” lifespan and were “a lot” healthier. It should be noted that the mice were allowed to eat as much as they wanted on the day they were given food, and they usually consumed about double what a mouse normally would.

Studies by the University of Columbia found that fasted rats recovered from spinal injuries quicker, with increased neuronal regeneration.

These are just a few examples of studies showing the benefits of fasting in animals.

Benefits For You

In humans, studies have shown that fasting causes the body to switch from using glucose stored in the liver for energy to ketones, which are stored in fat. According to the United States National Institute on Aging, the key here is not weight loss, but the increase of ketones in the bloodstream, which has some large positives including improving glucose regulation (think of those with diabetes!), removal or repair of damaged molecules, increased stress resistance (including improving body’s defences against oxidative and metabolic stress), and suppressed inflammation (including inflammation caused by osteoarthritis and IBS).

Human studies conducted by Salgin, Marcovercchio, Hill, Dunger and Fystyk (published 2012) found that a 24-hour fast increased growth hormones (HGH) as well. HGH are vital for growth, metabolism, weight-loss and muscle strength. Another study on men found fasting for two days increased HGH by 5 times the amount before the fast!

And, just like for dogs, fasting can help with arthritis pain, studies show. One study conduct by Andreas Michalsen for Charite University in Berlin, Germany (published February 2019), showed “Modified fasting (up to 500 kcal energy intake per day) for 7-10 days leads to an improvement of the symptoms in many patients with rheumatoid arthritis and is regularly used by the applicants for the treatment of rheumatoid arthritis.”

And while there are not currently any studies on fasting and aging on humans, the animal research shows that it can lengthen their lifespan, so it may just do the same for humans too!

Intermittent Fasting

Intermittent Fasting is the most common type researched. It involves lowering your food intake to none or a minimal amount for hours to days. The most common ratio used in research is fasting two days a week OR daily restricted feeding where you only eat during a six-hour window each day. These types of fasting can be used for both dogs and humans, so you could even put you and your dog on the same schedule!

Researchers have found even cutting your dogs food down by 70% for one day a week can be beneficial. Many people who fast their dogs give them a bone broth (such as chicken or beef stock) on fasting days, to make sure they get plenty of fluid (and let’s face it, to keep their dog from begging all day!).

Be sure you are doing a correct, interment fast, and not a “starvation diet.” Starvation occurs when the body does not get enough nutrients to function properly. After consuming fat reserves, the body will start to use the proteins within its own muscle tissues. You do not want this! However, a fast done correctly will not put you or your dog in any danger of starvation.


If you have any questions or concerns about your current health or your dog’s before beginning a fasting regime, talk to your doctor and/or veterinarian. Then, you may just decide to try a joint day of fasting where both human and canine let their systems flush and reset, so you can both live healthier, and maybe even longer, lives.

At Stay Loyal we recommend feeding healthy adult dogs one meal per day, six days per week. With one fast day which equates to 48 hours of no food and unlimited water. We also recommend feeding a nice juicy raw meaty bone twice a week, no kibble on these days. Try this with your dog and I am sure you will see an increase in vitality



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