5-Day ProLon® Fasting Mimicking Diet Challenge September 2026 | Luxembourg
5 Days. Measure the Difference.
Experience the ProLon® Fasting Mimicking Diet with MobiGym guidance, community support and objective before-and-after body composition measurements.
Follow a scientifically designed 5-day nutrition program created to mimic key effects of fasting while still providing carefully formulated plant-based foods.
Your MobiGym Challenge includes:
✓ Complete 5-Day ProLon® program
✓ Pre-challenge preparation and guidance
✓ Private WhatsApp support throughout the challenge
✓ Daily tips and check-ins
✓ Body Composition Analysis before the challenge
✓ Body Composition Analysis after the challenge
✓ Personalized interpretation of your results
✓ Guidance for transitioning back to your normal diet
Two Body Composition Analyses included — normal value €76
Ready to join the September Challenge?
Register below to reserve your place and ProLon® kit.
Why do it with MobiGym?
More Than a 5-Day Fast
Don't just complete the challenge. Measure how your body responds.
You can complete ProLon® on your own. At MobiGym, we add something different: guidance, accountability and objective measurement.
Before and after the 5-day challenge, we assess your body composition using professional multi-frequency BIA.
We can track changes in:
Body weight
Body fat
Fat mass
Visceral fat rating
Muscle mass
Hydration and fluid balance
Metabolic age and other body composition indicators
After your second assessment, we'll help you understand what changed — and what the results may mean for your next steps.
MobiGym's approach is simple:
Measure → Act → Re-measure
Because when it comes to longevity, we prefer data over guesswork.
Individual responses to dietary interventions vary and short-term body composition changes may also reflect changes in hydration.
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TO KNOW MORE AND SEE SOME RESULTS from REAL PEOPLE LIKE YOU
WHAT IS THE PROLON® FASTING MIMICKING DIET?
ProLon® is a structured 5-day nutrition program developed from research led by Professor Valter Longo and designed to mimic key physiological features of prolonged fasting while still providing food.
Each day contains carefully formulated plant-based foods, beverages and supplements with specific amounts and ratios of macronutrients and micronutrients.
The program is designed to provide nourishment while reducing nutrient-signalling pathways associated with normal eating.
The complete 5-day kit includes pre-portioned foods such as soups, bars, olives, herbal teas, drinks and supplements, so there is no need to design your own fasting protocol.
Why Fasting Mimicking?
Research into periodic Fasting Mimicking Diets has investigated potential effects on several markers associated with metabolic health and healthy ageing.
Studies of repeated FMD cycles have reported changes including:
Metabolic Health
Research has observed improvements in several metabolic and cardiometabolic risk markers in selected study populations.
Body Composition
Studies have reported reductions in body weight and abdominal or visceral fat while helping preserve lean body mass.
Healthy Ageing Research
Fasting Mimicking Diets are being studied for their effects on biological pathways associated with ageing, cellular stress responses and metabolic health.
A Practical Alternative to Water-Only Fasting
Unlike prolonged water-only fasting, ProLon® provides a structured five-day nutritional program with pre-portioned foods and defined daily intake.
Important: Research outcomes often involve repeated monthly FMD cycles rather than a single 5-day cycle, and individual results vary.
How the September Challenge Works
1 — Reserve Your Place
Register for the September challenge and secure your ProLon® kit.
2 — Establish Your Baseline
Before starting, visit MobiGym for your first Body Composition Analysis and challenge preparation.
3 — Begin the 5-Day Program
Follow the foods and instructions provided in your ProLon® kit.
4 — Stay Supported
Join the private MobiGym WhatsApp group for daily guidance, practical tips and shared accountability throughout the five days.
5 — Re-measure
After completing the challenge, return to MobiGym for your second Body Composition Analysis.
6 — Understand Your Results
We'll review the before-and-after data with you and discuss what changed and appropriate next steps.
What Can You Expect During the 5 Days?
The ProLon® kit provides your planned food and beverages for each day, removing much of the guesswork normally associated with fasting.
As calorie and nutrient intake changes, you may experience changes in hunger, energy and how you feel during the program. Experiences vary considerably from person to person.
Some participants find the first few days more challenging as they adapt to the reduced intake, which is one reason MobiGym runs the challenge as a supported group rather than simply providing the kit.
During the challenge, we recommend following the ProLon® instructions carefully and avoiding unnecessary modifications to the protocol.
September 2026 Challenge
ProLon Original — €179 (standard price 189)
ProLon Next Gen — €219 (standard price 249)
Your registration includes:
✓ Complete 5-Day ProLon® kit
✓ MobiGym pre-challenge preparation
✓ Private WhatsApp challenge group
✓ Daily support during the 5 days
✓ Pre-challenge Body Composition Analysis
✓ Post-challenge Body Composition Analysis
✓ Personalized before-and-after interpretation
✓ Post-challenge transition guidance
Body Composition Analysis value included: €76
Limited number of challenge places and ProLon® kits available.
OR Feel free to use the Discount Code 
on the Prolon Website
Register by September 12th to secure your place in this exclusive challenge.
Start filling the Survey https://mobigym.odoo.com/survey/start/5ca47774-1aba-4e5e-b45b-980f729325ab
MobiGym will be at the:
Where you can pick up the kits and have an introductory consultation with us.
FREQUENTLY ASKED QUESTIONS
Q: Is the ProLon® diet safe?
A: Yes, ProLon® has been clinically tested for safety. However, as with any dietary program, it's important to consult with your healthcare provider before beginning, especially if you have existing health conditions.
Q: Will I be hungry during the 5 days?
A: The ProLon® diet is specifically designed to provide nourishment while triggering the fasting state benefits. Some participants experience mild hunger, particularly on days 2-3, but our support group and expert tips will help you manage this effectively.
Q: Can I exercise during the program?
A: Light exercise such as walking is recommended. Our experts will provide specific guidance based on your fitness level and goals.
Q: What happens after the 5-day challenge?
A: We'll provide a structured reintroduction plan and recommendations for maintaining benefits. Challenge participants will also receive exclusive offers on MobiGym's comprehensive longevity programs.
Q: Is ProLon® suitable for everyone?
A: ProLon® is designed for generally healthy adults. It is not recommended for pregnant or nursing women, individuals under 18, or those with certain medical conditions. Our pre-challenge consultation will help determine if it's right for you.
Important Health Information
The ProLon® Fasting Mimicking Diet and the MobiGym Challenge are intended for general wellness and educational purposes and are not medical treatment.
MobiGym does not diagnose, treat or provide medical care. Individual responses to fasting and dietary interventions vary.
Before beginning the program, consult your physician or another qualified healthcare professional if you have a medical condition, take medication, are pregnant or breastfeeding, or have any concerns about whether fasting or calorie restriction is appropriate for you.
Body composition measurements are provided for monitoring and educational purposes and should not be interpreted as medical diagnosis.
ProLon® is a registered trademark of its respective owner.
ProLon® is a registered trademark. MobiGym is an authorized ProLon® seller.
Let's Connect
If you have more questions, feel free to reach out here or on Whatsapp