Quote · The Peter Attia Drive
#397 ‒ Endometriosis and adenomyosis: diagnosis, fertility, reproductive aging, and emerging treatments | Renato Tomioka, M.D., Ph.D.
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Common misconceptions about fertility: maternal age, embryo aneuploidy, the inefficiency of human reproduction, and the limits of IVF
At 1:22:20 · chapter starts 1:22:16
This chapter consolidates the episode's core fertility message. Tomioka stresses that maternal age is far more decisive than most clinicians communicate — he has seen doctors encourage 42-year-olds to try naturally after surgery, which he considers a serious mistake given that over 80% of their blastocysts will be aneuploid. [1] — Renato Tomioka "~35% aneuploidy at age 31–34: At ages 31 to 34, approximately one-third of blastocysts are aneuploid; the rate climbs to 40% by 35, 60% by …" 1:02:00 He then reveals the J-curve that few patients or clinicians know about: aneuploidy is actually higher in women under 22 than in women at 25, their biological prime. The sweet spot is around 25, and rates accelerate after 30. The evolutionary interpretation is that selection optimized for 25-year-old mothers. [2] — Renato Tomioka "The aneuploidy rate follows a J-curve, not a straight line. Very young women (under 22) have higher aneuploidy than 25-year-olds due to mon…" 1:23:10 Tomioka also contextualizes IVF's fundamental limitations: it groups embryos together at scale but cannot improve their intrinsic quality. Human reproduction is inherently inefficient — 1,000 eggs lost per cycle to ovulate one — and this inefficiency compounds across every stage of IVF, from retrieval to maturity to fertilization to blastocyst to euploid transfer.
The aneuploidy rate follows a J-curve, not a straight line. Very young women (under 22) have higher aneuploidy than 25-year-olds due to monosomy. Peak egg quality hits around 25. This isn't coincidence — evolution appears to have optimized for 25-year-old mothers.
Only about 10% of women who electively freeze eggs ever return to use them. Most get pregnant naturally. The cost-effectiveness sweet spot is around 32 to 35, not 25, because the biological advantage of younger eggs is offset by the high probability they're never needed. Freezing at 25 makes biological sense; freezing at 32–35 makes financial sense.
