What happened in this episode?
Thomas DeLauer interviews gerontologist Valter Longo about research on fasting-mimicking diets (FMD) and metabolic health. Longo describes mouse experiments in which a Western-style diet produced severe metabolic changes and substantially shorter lifespan, and he says adding five days per month of an FMD produced outcomes closer to healthy controls than expected, prompting a hypothesis that periodic “resets” may prevent a cumulative shift into a more metabolically damaged state. He also discusses cholesterol and inflammatory context, suggesting that short-term elevations in markers like LDL may be less harmful than prolonged movement into a chronic pro-inflammatory condition, while emphasising uncertainty.
Longo says his group has completed a large human study in Italy involving roughly 500 overweight or obese participants testing an FMD cycle as infrequently as once every three months, with results still to come. He argues that growth hormone/IGF-1 signalling may be a key regulator of the benefits observed with fasting-mimicking approaches, contending that lower signalling could facilitate autophagy and regenerative programmes. He discusses protein intake and resistance training, claiming exercise stimulus matters more than very high protein for muscle outcomes, and warns that excessive protein may carry longevity trade-offs.
Later, Longo claims that in a trial involving chronic kidney disease patients, kidney progenitor cells in blood tripled after the fasting-mimicking diet, and he describes broader research interests in performance and recovery, including whether such protocols could extend elite athletic careers or maintain operational readiness in military contexts.
