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Prolon Fast Bar Review: Does It Really Work? (My Opinion)

Written By: Paul

Prolon Fast Bar Review
Last Updated on December 1, 2023

Both beginners and people who have been on intermittent fasting (IF) for a long time will tell you that there will be unavoidable instances when hunger is just too powerful and challenging to deal with.

This is where high-quality dietary supplements come in!

I recently came across an interesting item that could potentially help me fulfill my fasting protocols without too much struggle, and I knew I had to try it immediately.

Are you looking to learn all about Prolon Fast Bars and whether or not they’re worth it? You’ve come to the right article.

In this comprehensive Fast Bar review, I’ll give you:

  • A complete rundown of what the product has to offer

  • My overall experience after trying the product for a month. 

Let’s get into it!

Fast Bar At A Glance

Fast Bars

Prolon Fast Bar first came onto my radar after seeing it online and getting a recommendation from a friend. Here are their offerings and primary selling points: 

  • Best Match For: People looking for unique snack bars to maximize the intermittent fasting potential by reducing hunger and extending their fas
  • Quantity: Fast Bars are currently sold on their website in packs containing 12 pieces.
  • Flavors: Fast Bars are available in three tasty flavors: Chocolate Chip, Nuts and Honey, and Coconut Macadamia.
  • Claims: Prolon Fast Bar is the premier Intermittent Fasting Bar that you can consume within your fasting window without removing your body from a fasting state!  It is made with a proprietary formula consisting of carefully selected ingredients that do not trigger your body’s nutrient-sensing system – keeping it fasted.

Overview of Fast Bar

Fast Bar is an intermittent fasting bar that helps you fast for longer by minimizing hunger and keeping you satiated without breaking your fast. It is clinically proven to keep you in a fasted state even after consumption.

With over 25 years of quality research conducted at the University of Southern California (USC), L-Nutra’s products effectively mimic the effects of fasting to promote longevity and overall well-being, as well as improve the body’s natural ability to fuel.

Fast Bars work by tricking your body into thinking that it is fasting.

Based on a study, their Fasting Mimicking Diet Nutri-technology has been clinically proven to be the only food you can eat during your fasting window while keeping your body in a state of ketosis.

What Are Prolon Fast Bars Made of?

Prolon Fast Bar ingredients consist of a delicious blend of premium nuts such as macadamias, pecans, and almonds. 

These nuts provide a wide variety of nutrients like omega-3 fatty acids, vitamins, minerals, and fiber. Fast Bar products are keto-friendly, gluten-free, soy-free, dairy-free, and non-GMO.

Fast Bar Nutritional Information:

  • 190 calories
  • 5 - 6 g of plant-based protein
  • 17 - 18 g of Carbs
  • 14 g of Fat
  • 7 g of Fiber

Prolon Fast Bars

Taste and Texture of Fast Bar

Taste and Texture of Fast Bar

Depending on the flavor, Fast Bars generally have a sweet flavor profile that authentically showcases its ingredients such as honey, coconut, sea salt, and chocolate chip. It has a soft and semi-nutty texture that has just the right amount of chewiness.

What I Like and Dislike About Fast Bar, After Using It for a Month

Prolon Fast Bars have been an absolute game-changer in my everyday nutrition because of their revolutionary food technology! However, I did also encounter a few downsides that are important to note:

Here’s What I Like

  • Highly effective for IF

I immediately found that Fast Bars made my IF diet much easier to adhere to. It noticeably helps keep me satiated whenever I find myself struggling with my diet restrictions.

  • Backed by advanced research and data

Prolon and its parent company consist of globally respected dieticians and nutritionists in their fields. Their products are based on Nobel Prize-winning science with millions of dollars invested into research and development.

  • Vegan-friendly option

Fast Bars are an excellent choice because they provide plant-based protein. I’ve been moving towards purely whole food sources and they have played a huge role in helping me reach my nutritional goals.

  • Made with high-quality ingredients

When it comes to flavor and texture quality, Fast Bars are definitely up there on the list for me! The premium nuts make a significant difference in comparison to other more sub-par products. 

The Things I Don’t Like

  • Limited flavors

Fast Bars are currently available in three flavors. Although each type is delicious in its own way, it can be troublesome whenever my palate is craving a bit more variety.

  • Not suitable for those with nut allergies

Since Fast Bars are made with macadamias, pecans, and almonds, they can be dangerous if you have a sensitivity to nuts. Some individuals can have a severe allergic reaction and may require medical attention.

  • Relatively costly

Fast Bars are a more affordable choice than the five-day Prolon plan but can still be considered pricey. There are tons of alternatives available on the market that are less costly and have different features.

  • Sub-optimal macronutrients for some

Depending on your health goals, Fast Bars may not provide the right balance of macronutrients needed in your diet. They haven’t been the best choice whenever I need more protein with less carbs and fat.

How Much Does It Cost?


12-pack box

Nut & Honey


Chocolate Chip


Coconut Macadamia


Variety Pack


Where to Buy Fast Bars?

The easiest way to buy Fast Bar products is on the company's own website, where you'll also find a wealth of information in the form of videos, blogs, and articles. There are four options to choose from:

  • Nuts and Honey
  • Coconut Macadamia
  • Chocolate Chip
  • Variety (a mix of the three flavors)

Alternatively, you can subscribe for a regular delivery and save 20%! 

Once you've made your choice and it's in your shopping cart, simply enter your email, complete your payment and the company will take care of the rest. I highly appreciate that shipping is free for any order over $150.

What Do Others Say About Fast Bars?

There are several patrons and repeat customers on the Fast Bar website who have shared testimonies of their experience with the product

Their sentiments range from how the texture is on point to its great taste and filling qualities that are worth every penny.

You’ll find tons of Prolon Fast Bar reviews on Amazon that have mostly positive feedback. 

Some have praised it for how it holds them over in between meals, while others have complained about feeling hungry after 90 minutes of eating a bar.

The Verdict: My Overall Review of Fast Bar

If you need help reaching your IF goals, or you're looking for an easy yet healthy meal replacement, these bars are an excellent option.

After a month of trying Prolon Fast Bar, I’ve seen immense benefits in my physique, general well-being, overall mood, and diet consistency.

Not only did these nut-packed bars keep me full and happy, but they tasted pretty great too.

Whether you are new to IF or have been sticking to a program for years, I highly suggest trying Prolon Fast Bar because its groundbreaking nutri-technology can help you achieve your dietary benchmarks as efficiently and effortlessly as possible

It's a win-win in my opinion!


Are fast bars healthy?

Yes. Fast Bars are made with nuts that are fully equipped with vitamins, minerals, fiber, omega-3 fatty acids, and antioxidants.

Does Fast Bar break your fast?

No. Its proprietary formula and premium ingredients do not activate your body’s nutrient-sensing system and trick your body into thinking it’s in a fasted state.

How many calories in a Fast Bar?

A Fast Bar contains 190 calories.

Can I eat a Fast Bar at night?

Yes. It is best enjoyed as a late-night snack or during your morning fasting window to help keep you satiated.

Fast Bar

  • Help support a healthful lifestyle
  • Vegan-friendly
  • Bars help fill the gap and satiate dieters who are struggling with IF
  • ProLon and its parent company are respected by dieticians and nutritionists
  • Excellent reviews from customers and experts alike
  • Makes an IF diet much easier to adhere to
  • Not a crash diet or an unsustainable diet
  • Fast Bar nuts are premium products

Hi, I'm Paul. Welcome to my website! I, along with my cronies, are leveraging our years of working in the food industry to review meal and drink delivery services. We review. You eat happily ever after.

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