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Fast Bar - Intermittent Fasting Bars

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4.7 out of 5 stars

Fast Bar makes intermittent fasting easy. It's the only nutrition bar you can eat during your fasting window without taking you out of fasting mode.

Over 20 years of research, scientists studied how unique blends of macronutrients and micronutrients could be consumed without kicking your body out of a fasting state. It is this formulation used to create Fast Bar.

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Nutrition Fact Information

Fast Bar Secret Ingredients

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Yes — Amazingly, when you eat Fast Bar, your body thinks it's still fasting Fast Bar’s proprietary formula of premium ingredients doesn’t trigger your body’s nutrient sensing system, so your body’s tricked into thinking it’s fasting. It's the only thing you can eat during your fasting window without breaking your fast — eat without your body even knowing it.

Clinical Trial Clinical Trial
*In a randomized, controlled study of 105 adults, participants fasted overnight for 15 hours, then had either breakfast, a Fast Bar, or water. Blood glucose and ketones were measured every hour for 4 hours with results shown above. Click here to read the published scientific article.

Delicious + Healthy = Extraordinary

Fast Bar is made with premium nuts like Macadamias. Nuts contain a variety of health-supporting nutrients like antioxidants, vitamins, minerals, fiber and Omega-3 fatty acids.

Fast Bar’s recipe is designed to nourish your body while maintaining its fasting state. For that reason, it’s best enjoyed during either your morning intermittent fasting window or as a late-night snack to satiate you before bed.

Similar to water, our delicious flavors do not raise your blood glucose levels and keep your ketones in a fasting state*!

What Customers Are Saying

This is an excellent product.

This is an excellent product. The fast bars are very helpful in trying to lose weight by lowering the hunger feelings, especially after exercising at the gym. The fast bars also help you to skip a meal and feel satisfied until your next meal. My doctor recommended fast bars to me and I have been buying them since I found out about fast bars.


Excellent product! I recently ordered a large quantity of...

I recently ordered a large quantity of fastbars because I've ordered before and really like them. The ingredients are excellent quality, the taste is much better than similar items on the market, and the amount of calories is just right. I use them when I do a several day fasting mimicking fast as well as for snacks in general. Thanks for an excellent product.


I love these bars.

I love these bars . I use them every morning as I am doing an intermittent fasting. I do lunch & dinner so I have a fast bar in the morning to prolong my fast. They tasted delicious all of them but my favorite is nuts & honey.. I am planning to buy them until I reach my healthy weight.

mathilde Fletcher

Keep fasting!

I bought these with the intent of using them as a last resort when I'm about to cave before my 6 hour eating window opens. So far, so good! I've eaten them a few times to hold out that last hour or so.

Rebekah Bevill

I love these bars!

I love these bars! Will have a whole bar for breakfast or half a bar as a snack when biking or hiking. A go to when traveling. I like all 3 varieties but the original Nuts & Honey is my favorite.

Carol M.


What is Fast Bar and how do I use it?

How often should I eat Fast Bar?

What are the results from your first Fast Bar study?

Is there additional research behind Fast Bar?

How can Fast Bar support fasting if it contains calories?

Is there a difference between Fast Bar and the L-Bar in ProLon FMD?