Q&A Highlights: February 2025

About this video

In this February 2025 Q&A, Yurth expresses skepticism about epigenetic aging clocks, arguing rapid score changes likely reflect shifting markers rather than true reversal of biological age. She warns that cholesterol driven too low carries its own risks and again emphasizes ratios over a single total. She explains why creatinine-based kidney estimates can mislead in very muscular people, people with little muscle, and creatine users, and why she prefers a cystatin C-based estimate. She presents ketones as an alternative brain fuel after traumatic brain injury, with anti-inflammatory effects she says matter in the days after injury. She also praises trehalose and argues chronic inflammation should ultimately be traced to mitochondrial redox balance after basic hormones and nutrients are addressed.

Key takeaways

• Be skeptical of aging clocks that move dramatically in days
• Avoid assuming lower cholesterol is always better; check the pattern behind the number
• Question a kidney estimate that ignores muscle mass, diet, and creatine use
• Think of ketones after head injury, in her framing, as alternate fuel plus inflammation control
• Look to mitochondrial redox balance when inflammation persists despite basic fixes

Episode details: published February 20, 2025 · 254 views · 9:16 long. Summary written by Self Growth Videos from the episode itself. The longevity and peptide concepts described are Dr. Elizabeth Yurth’s, presented for education — not medical advice. Consult a qualified professional before changing your own health practices. Disclosure: Dr. Yurth is co-founder and Chief Medical Officer of the Boulder Longevity Institute, a clinic, and BLI Academy sells clinician education.

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