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Where the Prolon Fasting Bar fits in my fasting routine

I keep a morning fasting window, and I spend most of my mornings on the move. For years those two things didn't go together very well. This is how I handle my mornings now, and how the Prolon Fasting Bar ended up in my bag.

Jennifer Mazonas By Jennifer Mazonas
Morning sunlight across a wooden kitchen counter holding a packed canvas tote with a folded sweater and a steel water bottle, a mug of black coffee, an insulated lunch bag and a set of keys

This is actually the only snack bar I've been reaching for lately, especially on busy days. Most of my days are busy, so I want to explain how that happened.

I don't have time to overthink my mornings

My mornings are getting the kids up, packing lunches, and getting everyone out the door. Somewhere in there I'm supposed to take care of myself too. Between getting home, unpacking lunches, and just everything going on, I don't really have time to overthink what I'm doing for myself.

What I do for myself is keep a morning fasting window. I finish dinner in the evening, and then I let my body rest overnight and into the morning instead of starting the day with something sugary. It's the one part of my wellness routine that has stuck, because it doesn't take any planning or cooking.

The window itself was easy for me. The hard part was getting hungry in the middle of it.

A quiet morning moment at home with a Prolon bar

Snack bars kept letting me down

I get hungry in the middle of the morning, usually while I'm out running errands. My old fix was whatever bar was at the checkout counter. Most bars either spike me up and an hour later I'm hungry or they just don't really fit into my wellness goals.

A typical snack bar is food your body fully responds to. It triggers the body's "fed" response. Blood sugar goes up, then comes back down, and an hour later you are hungrier than before.

When that happened during my morning fasting window, the window was over. I was starting my day with the crash I was trying to avoid in the first place.

The bar that was made for the way I fast

Then I found the bar I talk about in my videos now: the Prolon Fasting Bar — it's different. This is not your typical snack bar. It was designed by longevity scientists and uses fasting mimicking technology.

Prolon Fasting Bar Nuts and Honey box on a wood cutting board
The Prolon Fasting Bar in the Nuts and Honey flavor.

The way Prolon's team explains it is that food triggers the body's "fed" response; the Fasting Bar stays below nutrient-sensing pathways so the body still thinks it's fasting.

For me that means I can eat something real in the middle of my morning fasting window, my blood sugar doesn't spike, and the window keeps going. The bar does have real ingredients and real calories, but is designed to keep my body in a fasting state. That's how I get through the morning without giving up on the window.

This is the bar from my videos. Three flavors and a variety pack, shipped in 2 business days.

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It lives in my bag now

They come individually wrapped, twelve to a box, so I keep one in my bag, one in the car, and the rest in the pantry. Most often I eat one mid-morning during my fasting window, whether I'm out running errands or sitting in the carpool line.

An open canvas tote bag resting on a lap in the passenger seat of a parked car, holding a folded plaid scarf, a set of keys and a plain paper-wrapped bar

It tastes like a treat

If a bar doesn't taste good, I stop eating it no matter how healthy it is. And honestly, Fasting Bars taste so good. I love that the Chocolate Chip one has real chocolate in it so it feels like a treat and not something that's restrictive.

Cross-sections of the Prolon Fasting Bar with its key attributes listed alongside
The inside of the bar. Chocolate Chip is the one I keep in my bag.

It comes in three flavors, Chocolate Chip, Coconut Macadamia, and Nuts and Honey, plus a Variety Pack if you want to try all three. And I'm not the only one eating them. My husband can't stop eating them either, even though he doesn't follow a fasting routine.

He just likes them, and I like that his snack doesn't spike his blood sugar either. For him it's simply a smarter snack. For me it's a smarter snack that also keeps my morning fasting window going.

From the Prolon science team

The science behind the bar

The body doesn't respond to food based on calories alone. It responds to signals. When you eat, nutrient-sensing pathways like mTOR, RAS, and PKA activate and tell the body that nutrients are abundant, shifting it into a "fed" state focused on growth and storage.

During fasting, those same pathways quiet down and the body shifts into fat utilization and cellular cleanup. L-Nutra scientists, in collaboration with the USC Longevity Institute, researched exactly how much, and what type, of nourishment could go in while staying below those signaling thresholds. The Fasting Bar is the result.

In a randomized controlled study, the Fasting Bar produced glucose and ketone curves comparable to drinking only water. Blood sugar doesn't spike, and the fasting state stays intact.

The Prolon Fasting Bar with key benefits: extends fat burning, no blood-sugar spike, curbs hunger

Same effect on glucose and ketones as drinking water.

Randomized controlled study of the Fasting Bar versus water only. See sources and notes below.

A couple at home sharing a Prolon Fasting Bar

What's in it

Almonds, macadamias, and pecans are the headline ingredients, alongside complex carbohydrates for steady absorption, 6g of plant-based protein, fiber, omega-3s, antioxidants, vitamins, and minerals.

Research published in the New England Journal of Medicine linked eating nuts seven or more times per week with roughly 20% lower mortality from any cause.

Plant-Based
Gluten-Free
Non-GMO
Dairy-Free
25+
Years of fasting biology research
47
Clinical trials behind the broader Prolon platform
200+
Issued or pending patents
1M+
Happy Healthy Customers

Pick your flavor

The bar from my bag

Three flavors and a Variety Pack. Twelve individually wrapped bars per box.

Prolon Fasting Bar Variety Pack box
4.4 ★★★★★ 1M+ Happy Healthy Customers

Available in 3 flavors + Variety Pack · 12 bars per box

The only bar clinically proven to keep you in a fasting, fat-burning state

Same patented fasting mimicking technology in every flavor. Get the Variety Pack and try them all, or pick a single flavor on the product page.

  • ✓Variety Pack
  • ✓Chocolate Chip
  • ✓Coconut Macadamia
  • ✓Nuts & Honey
Plant-Based
Gluten-Free
Non-GMO
Dairy-Free
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Sources and notes

  1. Fasting Bar mechanism (nutrient-sensing pathways) per Prolon brand materials. The study cited: a randomized, controlled study in 105 adults after a 15-hour overnight fast, comparing glucose and ketone results every hour for 4 hours across the Fasting Bar, breakfast, and water-fast groups. Data on file with Prolon.
  2. Bao et al., New England Journal of Medicine, on the association of frequent nut consumption (seven or more times per week) with roughly 20% lower all-cause mortality. Note for review: Prolon's Fasting Bar Info Sheet cites this figure as lower cardiovascular mortality; the approved Round 5 page carries the all-cause form used here. Prolon team to confirm the preferred form.
  3. Institutional figures (25+ years of research, 47 clinical trials, 200+ patents, 1M+ Happy Healthy Customers) per Prolon brand materials.

Jennifer Mazonas is a paid Prolon partner. This page is written in her own words, drawn from her published videos and posts, and reflects her personal experience and routine; it is not a health or medical claim, and it is not advice on whether or how you should practice any form of fasting. The Prolon Fasting Bar contains calories and is designed to provide nourishment without triggering the body's typical "fed" response. Individual results vary. These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your physician before beginning any fasting or nutrition routine, particularly if you are pregnant, nursing, underweight, or managing a medical condition.

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