Exercise, Nutrition, Hormones for Vitality & Longevity | Dr. Peter Attia

Exercise drives multi‑system benefits because it alters circulating metabolites and growth factors (e.g., raising BDNF), improves endothelial function, and optimizes glucose/insulin signaling, which together promote neurogenesis, vascular health, and metabolic resilience.

The WHI's link between hormone replacement therapy and increased breast cancer risk was a small absolute effect and likely confounded because the trial enrolled older, sicker women and used conjugated equine estrogen plus synthetic progestin, which differ from contemporary bioidentical regimens.

Because atherosclerosis is initiated by ApoB‑containing particles, minimizing lifetime ApoB particle burden—rather than waiting for short‑term 10‑year risk thresholds—reduces the substrate for plaque formation and better prevents disease.

Blocking PCSK9 powerfully lowers LDL because PCSK9 normally binds LDL receptors and targets them for degradation, so inhibiting PCSK9 preserves receptor numbers and enhances LDL clearance from blood.

Statins lower LDL because inhibiting hepatic cholesterol synthesis causes hepatocytes to upregulate LDL receptors, which clear more LDL particles from the bloodstream.

Saturated fat intake tends to raise serum LDL because saturated fatty acids alter hepatic lipid handling and lipoprotein composition, increasing the cholesterol content carried in LDL particles.

Dietary cholesterol has little impact on serum cholesterol because most consumed cholesterol is esterified and cannot pass the intestinal NPC1L1 transporter into enterocytes, while excess sterols are actively pumped back out via ABCG5/8.

Very low VO2max greatly increases mortality risk because it measures the body's maximal oxygen delivery and use—integrating cardiac, pulmonary, and muscular function—and low values indicate poor physiological reserve.