STOP Intermittent Fasting If You Want to Stay Young

Dave Asprey

Feb 3, 2026

Episode description

STOP intermittent fasting if you think it automatically keeps you young. In this episode, you’ll learn why short-term fasting results can mislead long-term aging outcomes, and how duration, frequency, refeeding, and protein intake determine whether fasting supports longevity or quietly accelerates decline.

Watch this episode on YouTube for the full video experience:

https://www.youtube.com/@DaveAspreyBPR

Host Dave Asprey sits down with Valter Longo, one of the world’s leading longevity researchers with over 30 years of experience studying aging, nutrition, and disease prevention. Dr. Longo is the Director of the Longevity Institute at the University of Southern California’s Leonard Davis School of Gerontology and the Director of the Longevity and Cancer Program at IFOM, the Italian Foundation for Cancer Research Institute of Molecular Oncology in Milan. He is the author of the bestselling book The Longevity Diet and was named one of TIME Magazine’s 50 most influential people in health care for his research on fasting-mimicking diets.

Together, Dave Asprey and Dr. Longo explain why many people focus too heavily on short-term effects and extrapolate them incorrectly across a lifetime. They break down how intermittent fasting differs biologically from multi-day fasting, why five-day fasting cycles trigger deeper cellular changes, and how insulin, IGF-1, mTOR, and growth hormone shape aging, regeneration, and disease risk over time.

The conversation covers protein and amino acid intake, muscle preservation, frailty risk, and the tradeoffs between strength, function, and longevity. They explore ketosis, fasting-mimicking diets, stem cell activation, mitochondrial function, neuroplasticity, and why equilibrium and cycling matter more than constant restriction. Dave and Valter also discuss supplements, nootropics, creatine, carnivore-style eating, metabolism, sleep optimization, and how AI may eventually personalize fasting and nutrition based on individual biology rather than population averages.

You’ll learn:

• Why short-term fasting benefits do not predict long-term longevity

• How fasting duration changes gene expression and cellular regeneration

• The difference between intermittent fasting and multi-day fasting

• How protein and amino acids influence mTOR, IGF-1, and aging

• Why muscle, strength, and longevity must be balanced, not maximized

• When ketosis overlaps with fasting and when it does not

• Why supplements can disrupt biological equilibrium

• How AI could support future personalization in fasting and nutrition

Dave Asprey is a four time New York Times bestselling author, founder of Bulletproof Coffee, and the father of biohacking. With over 1,000 interview

Mindsip insights from this episode:

Prioritize Mediterranean diet over short-term interventions for longevity

People mistakenly focus on short-term effects of an intervention, like those from GLP-1 drugs, which may be less effective for long-term longevity than something like the Mediterranean diet.

#GLP1

#longevity

Maintain equilibrium instead of megadosing for longevity

Megadosing supplements can disrupt the sophisticated equilibrium the body has built over billions of years, leading to unknown long-term consequences.

#longevity

#supplement

Maintain healthy body fat to support aging

Especially after age 65, having very low body fat may be problematic as the body starts losing weight and fat serves as important energetic and stem cell reserves.

#aging

#fat

Reprogram old cells with Fasting Mimicking Diet

The Fasting Mimicking Diet can turn on reprogramming factors, like Yamanaka factors, which can bring an old cell back to an embryonic-like state in a coordinated way.

#fasting

#regeneration

Avoid long water fasts to protect gut health

Unlike the Fasting Mimicking Diet, prolonged water-only fasting was shown in mice to increase the leakiness of the gut.

#fasting

#gut

Implement protein restriction for enhanced longevity

Over 100 years of data, the only intervention to consistently make mice and rats longer-lived without calorie restriction is protein restriction.

#longevity

#protein

Prioritize growth hormone axis for optimal longevity

The most powerful and important longevity pathway to modulate is the growth hormone axis, even more so than the mTOR pathway.

#growth-hormone

#longevity

Shift focus to amino acid profiles for optimal diet impact

The conversation should shift from 'protein' to the specific 'amino acid profile' of a diet, as the effects can vary up to five-fold between different protein sources.