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On da grid with Zoe Zane - 24 hour protein fasting makes you younger!!! READ

What Is Bulletproof Protein Fasting – And How To Fast Correctly

This blog post is a part of a series of science posts leading up to the Bulletproof Diet book launch in December! I’ve been missing writing science posts because I’ve been putting so much energy into creating the book – it’s good to be back to writing on the blog now that I’ve finished it.  To learn more, click here to pre-order the book and receive 9 free bonus items!

Earlier this month at the epic Bulletproof Conference, I promised a post about Bulletproof Protein Fasting  – one of the most potent but underutilized tools in the Bulletproof biohacking toolbox. So, here it is!

In a (coco-)nutshell, Bulletproof Protein Fasting is a biohack to get a greater reduction in inflammation and to kick-start weight loss. For new readers and routine followers of the Bulletproof Diet alike, it is a day of protein fasting once per week, where you eat virtually no protein: limit your protein to 15 grams or less per day. To keep you full and energized, consume a cup of protein-free Bulletproof Coffee in the morning and have near-zero protein, high fats, and moderate carbs throughout the day. For optimal results, limit carbohydrates to the afternoon and evening.

Easy, right? Well, it turns out you might think you are protein fasting if you aren’t. This is most likely for one of three reasons:

  1. You are eating foods you don’t realize contain protein because we don’t think of them as typical high protein sources. What, broccoli has a little protein in it?

  2. By law, the FDA allows companies to label anything with less than one gram of protein per serving as having zero grams.  Even if you are reading labels closely, you won’t know if you are getting a few grams of protein if you eat five times the normal serving.

  3. You aren’t sure what a protein-free day of eating might look like, or how to count/measure in grams, or something like that (read below for easy hacks to these problems).

Here I explain the science behind protein fasting, as well as how to make sure you’re doing it correctly to achieve the performance, detox, or weight loss results you want.

The Benefits of Protein Fasting: Lose Fat, Detox Your Cells, and Sleep Better All At Once

By protein fasting once a week, you are essentially allowing your body a day to use its digestive machinery to perform self-maintenance. This is because dramatically lowering your protein intake once a week induces autophagy – or, literally translated, self-digestion. Yes, you heard it right: this means you’re eating your own protein and fat!

This is important not just for fat loss, but also for your cellular repair functions. Your enzymes from your pancreas and liver, in addition to breaking down and excreting toxins, have a secondary role of removing debris from the cells in your body.[i]

Protein fasting also improves mitochondrial function, which results in better sleep over time. In 2013, a team of researchers learned that autophagy is required for healthy brain cell mitochondria.[ii] Brain Octane oil provides ketones, which act as fuel for the mitochondria. If you follow the Protein Fasting portion of the Bulletproof Diet, you’re already upgrading your brain’s ability to drain waste as you sleep using the glymphatic system. This means that by itself, following the Bulletproof Diet will help most people get better quality sleep.

Here’s a quick video on how it works:

The Science: How Protein Fasting Works

The body’s natural cleaning process (autophagy), which recycles the junk in your cells and turns it into energy, is the cellular equivalent of burning your trash to stay warm. Over time, cells accumulate dead organelles, damaged proteins, and oxidized particles that interfere with cell function and accelerate aging. Autophagy is the body’s method of clearing out this clutter, meaning it helps keep you young. Clearly, autophagy is something you want your cells to do well in order to look, feel, and perform your best.

Autophagy is required to maintain muscle mass, and it inhibits muscle breakdown in adults.[iii] If you are interested in staying younger and building muscle by spending less time working out (and who isn’t?), of course it makes sense to hack autophagy. Let’s look at the two main signals for the body to turn on autophagy. The first is fasting.[iv] This was one of the reasons you’ll see such amazing results with Bulletproof Intermittent Fasting as well.

It turns out there’s an even better way to turn on autophagy, and that’s by occasionally limiting protein consumption. When you do this, you force your cells to find every possible way to recycle proteins. In their search, they bind and excrete toxins that were lurking in your cell’s cytoplasm, the gel-like substance enclosed within the cell membrane.[v] It’s like taking your car to the car wash and having it deep cleaned.

Studies have shown a number of additional benefits to being protein deficient that are similar to the benefits of fasting. The first is that protein deficiency lowers insulin and mTOR.[vi], [vii] Remember, stomping down mTOR so its secretion can spring back up is key to building muscle.  When I spent almost a year as a raw vegan, which automatically limited protein, it turns out it caused many health problems. In fact, being chronically protein deficient is awful for your brain and your body.

The trick is to become temporarily protein deficient. The simplest way to do this is to do a traditional fast and eat nothing for 24 hours or longer; however, because eating nothing for 24-48 hours is inconvenient if you have a job or friends, there is an easy hack for this.  If you want to experience the benefits without all that fun in a cave, Bulletproof Protein Fasting does the trick.

When I first started experimenting with this a couple of years ago, I limited my protein to no more than 25 grams – but I soon found out you get better results with even less.  Then a good friend and fellow biohacker named Josh Whiton told me to aim for 15 grams or less instead of 25 and to be more rigorous in my counting.[viii] Indeed, when I switched to a strict 15 grams a day, I felt a huge difference and had a visible reduction in my abdominal inflammation and muffin top. (No, I don’t walk around looking like a fashion model every day. Muffin top happens to the best of us!)

The magic number probably varies depending upon your activity level and personal variation, but you might as well try to go as low as you can get.

Should Anyone NOT Protein Fast? What Adjustments Can I Make?

Like Bulletproof Intermittent Fasting, Bulletproof Protein Fasting is not an all-or-nothing deal. Play around with what works for you. This may not be for everyone – there’s no data about doing this while pregnant, but it doesn’t sound like a great idea.

You can adjust the total amount of protein you’re eating on the day of your Bulletproof Protein Fast. This is another great opportunity to be your own biohacker in order to get optimal results. I tried eating only protein at dinner, but didn’t get much of the slimming effect, so I either do it right—for a full day at 15 grams of protein or less—or I just don’t do it.

Bulletproof Protein Fast: Sample Meal Plans and Protocol

Here’s a sample shopping list to stock up on in preparation for your big day of protein fasting:

  • Plenty of unsalted, grass-fed butter

  • Sweet potatoes, yams, carrots, cucumber, celery

  • Avocados

  • White rice (and fresh white rice mochi)

  • Low-fructose fruits: berries of all kinds, lime, and lemon

  • Bulletproof Coffee ingredients: Brain Octane; Upgraded coffee beans

The following sample meals will help your body detox even more efficiently while giving you an extra boost of energy.

1. Bulletproof Protein Fast Breakfast

Protocol: Choose one to have as soon as you get up or whenever you are accustomed to eating breakfast.

  • Bulletproof Coffee (without any added protein)

  • Green tea blended with butter and Brain Octane (not as powerful as Bulletproof Coffee, however!)

2. Bulletproof Protein Fast Lunch

Protocol: Choose one to be eaten 15 to 18 hours after last night’s dinner.

  • Guacamole with cucumber and/or celery sticks

  • Sweet potato-ginger soup

  • Iceberg salad with baked carrot fries

3. Bulletproof Protein Fast Dinner

Protocol: Choose one to be eaten 5 to 6 hours after lunch.

  • Iceberg salad with buttered white rice

  • Carrot-Fennel soup with white rice

  • Baked Sweet Potatoes with guacamole

4. Bulletproof Protein Fast Dessert (optional)

Protocol: To be eaten soon after dinner.

  • Bulletproof Berry Bowl: combine blueberries, raspberries, and strawberries with a squeeze of lemon juice and sprinkling of fresh chopped basil – enjoy!

How To Hack Your Protein Fast

Remember, your goal is to stay below 15 grams of protein total during your one protein fasting day each week. Some people find it hard to count to fifteen, or tell me they are too lazy to do so, so here are my favorite tips:


If you want to eat something and you aren’t sure if it has protein in it, I highly recommend the ancient biohack I like to call Google. You can simply type in “how much protein is in broccoli” or “protein in avocado” – or whatever you are trying to find out – to get an approximate measurement.


By purchasing a small kitchen scale, you’ll be able to measure out your portions of protein powders and other upgraded powders quickly and easily, which is useful for all Bulletproof recipes whether it’s protein fasting day or not.


Keep in mind this is not a cheat day. Do not give yourself permission to hit up all of your local fast-food joints and then eat an entire cake! Bulletproof Protein Fasting is simply a great way to get an even better reduction in inflammation and superior Bulletproof results. Call it a cheat day if you want – but only in that not eating enough carbs will cheat your body out of what it needs to burn fat and rejuvenate its detox systems!

Like I always say: if you’re hungry two hours later after a meal, you aren’t eating right. This guideline applies on all days of the week, even protein fasting day.

The meal ideas above are just a quick sampling of the types of foods you can eat while protein fasting.Many more detailed recipes for protein fasting breakfast, lunch, dinner, and dessert will be available in the forthcoming Bulletproof Diet book – available now to pre-order on Amazon!











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Tags: zoe zane protein fasting
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