Episode Summary: A Guide to the Fasting Mimicking Diet

Podcast: Living Well with Multiple Sclerosis
Host: Geoff Allix (Overcoming MS)
Guest: Professor Valter Longo
Release Date: March 4, 2026
Episode: S8 Bonus

Episode Overview

In this bonus archival episode, host Geoff Allix talks with Professor Valter Longo, creator of the Fasting Mimicking Diet (FMD), about the science and potential benefits of fasting mimicking for health, longevity, and, specifically, those living with multiple sclerosis (MS). Professor Longo dispels myths about fasting, discusses evidence and ongoing trials, and provides guidance for patients considering integrating FMD into their health routines—especially in consultation with their neurologists.

Key Discussion Points & Insights

The Origins and Appeal of Fasting (02:06)

• Cultural and Religious Roots: Fasting has a longstanding presence in many religious traditions, prompting scientific investigation into its health impacts.
• Science vs. Fashion: There is growing evidence that specific forms of fasting can yield health benefits, but Professor Longo warns against treating fasting as a short-lived trend without proper awareness of potential risks.

Quote:
"People have always wondered why [fasting has existed], and now science is beginning to show ... [it] can be both good and bad ... if you do it in a certain way ... this could be very beneficial."
— Professor Longo (02:06)

What Is the Fasting Mimicking Diet? (03:49)

• Difference from Water Fasting: FMD aims to replicate the positive physiological effects of water-only fasting while allowing consumption of specific foods, making it more accessible and safer for patients.
• Development: Driven by patient reluctance and medical concern over water-only fasts, FMD received backing from major institutions for research and clinical trials.

Quote:
"The idea was, can we get the changes that occur during water only fasting while patients are allowed to eat something very special ... what they consider relatively normal food?"
— Professor Longo (04:02)

Blue Zones & Diet Patterns (05:03)

• Definition: Blue zones are geographical areas with high concentrations of centenarians and markers of longevity, first identified in Sardinia, Italy.
• Diet and Fasting Practices: Contrary to expectations, extended fasting is not common among Blue Zone inhabitants; however, many practice overnight fasting (12+ hours), and generally maintain discipline in meal timing and portion sizes.

Quote:
"You do in centenarians ... often see people not eating dinner or having a very light dinner. ... I would be surprised ... if most of them did not do a 12 hour or a little bit longer fasting period every night."
— Professor Longo (07:08)

Evidence for Longevity and MS (09:19, 11:04)

• Longevity: While formal human longevity trials are lacking (due to time requirements), animal studies show significant increases in lifespan, delayed cognitive decline, and decreased cancer with FMD.
• MS-specific Research:
  • Clinical trials (with Charité Hospital, Berlin) showed improved quality of life for MS patients after a cycle of FMD.
  • Mouse studies similarly demonstrated symptom reduction and restored normality in some cases.
  • Larger, multi-center human trials are now planned to build on these findings.

Quote:
"In people, the clinicians did report an improvement in quality of life by doing a single cycle of a week long of a fasting mimicking diet."
— Professor Longo (11:18)

Myths and Misunderstandings: 5:2 Diet, 16:8 Fasting, and Improvisation (13:27, 14:03, 15:29)

• 5:2 Diet: Popular in the UK, the 5:2 diet (eat normally 5 days, restrict calories 2 days) is not considered a FMD, as the fasting responses differ.
• 16:8 Intermittent Fasting: Strongly discouraged for regular long-term practice; increases gallstone risk and is associated with higher cardiovascular disease.
• "Don’t Improvise": Emphasizes the need for evidence-based protocols, not fad or improvised regimes—particularly for vulnerable populations.

Notable Quotes:
"16:8 is a bad idea ... because of gallstone formation ... people that skip breakfast ... don't live longer, but they live shorter and they have increased cardiovascular disease."
— Professor Longo (14:03)

"Let's not improvise. ... Usually those things end up in disaster ... End up in many more people hurt by this than benefited from it."
— Professor Longo (17:13)

Navigating Evidence in Nutritional Interventions for MS (19:36)

• Discusses the practical challenges of conducting double-blind, placebo-controlled trials for diet interventions.
• Dr. Longo advocates for a pragmatic approach: repeated randomized studies showing benefit should justify patient and clinician discussions—even if perfect evidence is elusive.

Quote:
"You're never going to get the perfect trial ... If you show that a particular diet or fasting, mimicking diet works in a randomized placebo-controlled trial ... I think it's perfectly fine to say, hey, this is a recommendation."
— Professor Longo (19:36)

FMD in Real-Life Practice (24:53, 27:16, 29:27)

• Between Fast Guidance: The ideal is to maintain a healthy, evidence-based diet between FMD cycles, as outlined in Professor Longo's "The Longevity Diet."
• Frequency: Most healthy adults should not do FMD more than 3–4 times a year.
• FMD Kits: The ProLon kit delivers a standardized, clinically tested FMD with vegan, gluten-free foods (soups, nut bars, algal oil, etc.). Emphasizes safety and evidence over home-made attempts.
• Risks of Improper Fasting: Reports of harm when unsupervised, extended water fasting was attempted highlight the importance of following clinical guidance.

Quote:
"When you get to fasting making diets, I think it's better to go with the kit ... what's been tested clinically is much more complex than what I describe in the book."
— Professor Longo (27:16)

The Science behind FMD Effects (31:55)

• Beyond Calorie Restriction: FMD’s benefits stem from its formulation, which supports the gut microbiome and reduces systemic inflammation—a key consideration for autoimmune conditions like MS.
• FMD vs. Water-Only Fasting: In mouse studies, water-only fasting led to worse gut permeability; FMD’s blend of plant nutrients enhanced benefits, especially for the immune system.
• ProLon's Impact: Reduced inflammatory markers and systemic inflammation in clinical participants, even beyond MS.

Personalization and Future Directions (34:43, 35:39)

• Different diseases will eventually have optimized FMDs based on trial evidence (duration, ingredients, calories).
• Disease-specific FMDs are in development, but regulatory approval for disease claims awaits further evidence.

Quote:
"Each one is different ... we're developing or we have developed a different fasting mimicking diet that addresses ... that particular disease."
— Professor Longo (34:53)

How Should MS Patients Approach FMD? (36:51)

• For people already on the OMS Program diet, Longo recommends:
  • Reading "The Longevity Diet" for foundational insights.
  • Considering FMD kits (e.g., ProLon) only under supervision and in discussion with a neurologist.
  • Not altering existing medication regimens—clinical trials combine FMD with standard care, not as a replacement.

"If you cannot wait for the trials ... then that would be a good discussion to have [with your neurologist]: Is it safe enough that I give it a shot and see what happens to me? And then in combination with the standard of care ..."
— Professor Longo (37:36)

Notable Quotes & Memorable Moments

• On Fasting Fads:
  "Hopefully this ... doesn't end up as a fashionable thing ... and it ends up being a real therapy available in many, many clinics around the world." (02:36)
• On Evidence vs. Practice:
  "Most doctors are not trained in nutrition ... It'd be better for a doctor ... to say, I just don't know ... maybe there's somebody out there that knows better." (23:29)
• On Risk and Patient Autonomy:
  "People are not stupid. You can explain to them ... and as long as that is explained, it is their choice." (22:11)

Important Timestamps

• 02:06: Prof. Longo on fasting’s renewed scientific interest
• 03:49: The shift from water fasting to FMD
• 05:03: Explanation of Blue Zones and their dietary patterns
• 09:19: Longevity findings in animals with FMD
• 11:04: MS-specific FMD trials and early findings
• 13:27: 5:2 vs. FMD; misunderstandings and proper fasting definitions
• 14:03: Risks with 16:8 fasting, advice against it
• 15:29: Importance of avoiding improvisation with fasting diets
• 19:36: On clinical research evidence for dietary approaches in MS
• 27:16: ProLon kit: what’s inside and why follow protocols
• 31:55: Impact of FMD compositions on immunity and the gut
• 34:43: The future: disease-specialized FMDs
• 36:51: Practical advice: integrating FMD with OMS protocol and medical care

Actionable Takeaways for Listeners

• Consult your healthcare team before attempting FMD, especially if living with MS.
• FMD should not replace medical treatment—evidence is promising but not conclusive; always integrate with standard care.
• For general health, a balanced daily diet and periodic, clinically supported FMD (3–4 times a year) is most evidence-based.
• Avoid self-designed or improvised fasting regimens—use clinically tested kits (e.g., ProLon) as a safer option.
• Stay tuned as new, disease-specific FMD protocols undergo large-scale trials.

Further Resources

• Professor Longo’s book: The Longevity Diet
• ProLon website for FMD kits and research references
• Overcoming MS (www.overcomingms.org) for guidelines, recipes, and community support

This summary captures all the vital points, insights, and guidance from the episode, making it a valuable resource for anyone considering fasting strategies for MS or broader health goals.