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In this short podcast segment, the speaker explains that the body has an innate self‑cleaning system—autophagy, meaning "self‑eating" in Greek—that removes damaged mitochondria and misfolded proteins. As we age, this cellular renewal process becomes less frequent, leading to reduced cellular repair. The speaker notes that lifestyle practices such as fasting, sauna use, and cold‑water plunges can reactivate autophagy, and that certain food‑derived molecules, especially spermidine, also stimulate the process. Spermidine is highlighted as a naturally occurring compound produced by humans, animals, and virtually all plants, underscoring its widespread availability as a dietary means to support cellular renewal.

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