ProLon 5-Day Fasting Mimicking Diet kit
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The original Fasting Mimicking Diet, created by Dr. Valter Longo.

ProLon® 5-Day Fasting Mimicking Diet

  • Supports real weight loss while preserving lean muscle
  • The benefits of fasting — while you still eat real food
  • Everything included — no extra shopping, no guesswork
  • Backed by 25+ years of longevity science
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Everything you need for your 5-day reset.

Each ProLon 5-Day Kit includes carefully formulated plant-based meals, snacks, drinks, and supplements for each day of the program.

Five soups and meals
5 Soups & Meals
Five nutrient bars and snacks
5 Nutrient Bars & Snacks
Five drinks
5 Drinks
Supplements
Supplements
Program guide
Program Guide

As easy as open, mix, and enjoy

No cooking skills or meal planning required

  1. Step 1

    Open your day

    Grab that day’s clearly-labelled pack from the box.

  2. Step 2

    Add hot water

    Empty the soup into a bowl, add hot water, and stir.

  3. Step 3

    Let it sit

    Give it a minute to thicken while it cools slightly.

  4. Step 4

    Enjoy

    Sip, snack, and carry on with your day.

Support your body from the inside out.
Weight loss

Unlike many weight loss products and drugs, Prolon allows you to lose visceral fat while protecting muscle.
Cellular renewal

The Prolon FMD is the only nutrition program proven in human trials to kickstart autophagy, the body’s natural cellular renewal process.
Mental clarity

The mental shift that comes with the cellular renewal and ketosis Prolon supports can be just as noticeable as the physical one. Users feel it during the FMD — and many report lasting changes in their habits in the days after.
Skin

The Prolon 5-Day FMD is shown to increase skin hydration and give you a more radiant complexion. It’s skincare from the inside out. 
Healthy aging

Prolon is the only nutrition program patented for supporting longevity through cellular renewal. Research shows that three consecutive monthly cycles of the Prolon FMD can reduce your biological age by 2.5 years. 
Metabolic health

20 days of Prolon is as effective as 120 days of the Mediterranean diet on heart health, and supports healthy cardiometabolic markers.

PROLON 5-DAY FASTING MIMICKING Diet

Reset your body, rejuvenate your cells—in 5 days

The most powerful changes come from within. That’s the science-backed principle at the heart of Prolon’s patented 5-day program. You get the benefits of fasting while eating nourishing food.

Transition to a fasting state

Today, your body starts adapting to reduced calorie intake, depleting glucose stores (your primary energy source) and paving the way for fat-burning and cellular benefits.

Ketosis

For most, fat-burning is in full effect! By now, your glucose stores are depleted, and your body is fully transitioning to burning fat for energy, or ketosis.

Autophagy

By now, something incredible is happening—your body is transitioning to autophagy, the natural process that eliminates and recycles old, damaged cells.

Cellular rejuvenation

Your body is now in a heightened state of cellular rejuvenation, with autophagy in full swing, actively repairing and renewing cells. Fat burning is also at its peak.

Deep renewaland change

Your body has undergone a significant transformation: Autophagy recycled old cells to replace them with younger, high-functioning components. These cells now function as younger versions of themselves, supporting lasting benefits.

*Based on data from in vitro research

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Dr. Valter Longo

Created by Dr. Valter Longo, PhD

Dr. Valter Longo, Director of the Longevity Institute at the University of Southern California, was recognized by TIME as one of the top 50 most influential people in health.

As the pioneering mind behind the Fasting Mimicking Diet, Dr. Longo was awarded the first-ever patent for Healthspan. His groundbreaking work revealed how cells sense nutrients, leading him to develop the FMD formulation.

Through extensive mouse and human trials, he demonstrated the powerful benefits of this approach. These discoveries are the foundation of our Prolon product line, designed to bring the science of healthy aging to you.

Discover the science
25+ Years of scientific research
47 Clinical trials
18 Leading research institutions
200+ Pending or issued patents

How ProLon compares

ProLon compared with DIY fasting, juice cleanses and intermittent fasting
ProLon 5-DayDIY FastingJuice CleanseIntermittent Fasting
Food included Yes No No No
Science-backed fasting-mimicking nutrition Yes No No No
5-day structured program Yes No No No
Supports metabolic health Yes depends No Yes
No meal planning Yes No Yes No
Designed for periodic use Yes No No No
Designed to preserve lean muscle Yes No No No

Hear what real people are saying about ProLon

90% lost weight and kept it
67% reported reduced brain fog
72% saw improvement in their skin
87% had increased energy
5 out of 5 stars

“It works— weight management, energy, and mental clarity. I felt the best I have felt in years, I cannot wait to continue along this journey. Thanks ProLon!”

ANDREA G.

FAQs

ProLon is a structured 5-day program backed by 25+ years of longevity research. Follow-up cycles are typically spaced out as recommended by your healthcare provider.

You eat real food every day of the program. Most people feel satisfied, though some report mild hunger on day 2.

Each box contains five clearly labelled day-packs. Open the pack for that day and follow the included program guide.

Fasting-mimicking nutrition keeps your cells in a fasting state, which supports autophagy — the body’s natural process for clearing and recycling damaged cells.

Your body moves from depleting glucose stores, into ketosis, and then into autophagy across the five days.

In clinical studies, participants lost visceral fat while preserving lean muscle mass. Individual results vary.

The formulation is designed to influence nutrient-sensing pathways including mTOR, AKT, AMPK and the SIRT family.

Calories are stepped down across the five days according to the program design. Full details are in the nutritional information above.

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ProLon® 5-Day Fasting Mimicking Diet£162.89 Expanded Variety 4