The original Fasting Mimicking Diet, created by Dr. Valter Longo.
Invest in your health with ProLon
Plant-based nutrition programs that support weight loss, metabolic health, and longevity — with the benefits of fasting while you still eat
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Fasting Mimicking Diet
ProLon is a science-backed nutrition system built around fasting-mimicking technology. It includes structured programs and daily products designed to support weight management, metabolic health, cellular renewal, and healthy aging.
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Weight management and muscle protection
Metabolic health
Longevity and biological age
BEST SELLER
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.
*Based on data from in vitro research
Find the ProLon routine that fits your goal
Whether you want a deeper 5-day reset, fasting day support, or daily longevity nutrition, ProLon offers food-based products to support your routine.
BEST SELLERFor a deeper reset
Start with the ProLon 5-Day Kit, the fasting mimicking diet program with food included.
Starting at £39/day
Shop 5-day
For fasting support
Support intermittent fasting or lighter eating days with nutrient-rich bars and drinks.
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For daily longevity
Explore daily nutrition products designed to support long-term wellbeing.
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Not sure where to start?
Answer a few questions to find your routine.
Find your routine
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.
25+
Years of scientific research
47
Clinical trials
18
Leading research institutions
200+
Pending or issued patents
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
Proven benefits
Unlike extreme diets and drugs, Prolon helps you lose the weight you want to lose—visceral fat—while protecting your lean muscle.
The 5-day program is designed to trigger autophagy — your body’s natural process of clearing out and recycling old, damaged cells.
Many customers report sharper focus and reduced brain fog as the body shifts to ketone-based energy during the program.
Cellular renewal from the inside out — participants have reported visible improvements in skin appearance after completing cycles.
Built on 25+ years of longevity research, the Fasting Mimicking Diet supports the biology of healthy aging at a cellular level.
Clinical trials show support for healthy metabolic markers, including fasting glucose and cholesterol, in the majority of participants.
Articles and Podcasts
Learn more about fasting mimicking diets, longevity nutrition, weight management, and the science behind ProLon.
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Still deciding?
Common questions, answered
Whether you want a deeper 5-day reset, fasting day support, or daily longevity nutrition, ProLon offers food-based products to support your routine.
Is 5 days really enough?
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.
Will I be hungry?
No traditional fasting is required — each day’s food is pre-portioned and included in the box, so you eat throughout the program.
Is it safe?
ProLon is backed by decades of clinical research. As with any nutrition program, check with your healthcare provider if you have a medical condition or are pregnant.