Glossary
Concealed ovulation
The absence of any outward signal of human fertility. Paternity confidence, paternity confusion and alliance-building all have advocates, and no test has settled the question.
Published Updated
Where this comes from
In the reference topic that owns this term
Reference topic 32, The Reproductive Paradox, states the mismatch as a card: what the system evolved to expect, what it gets instead, and what happens in the gap.
Mismatch card
- What it expects
Steady energy availability, first births while fertility is at its peak, kin nearby to subsidize weaned children, and a lifetime of relatively few ovulatory cycles (Topic 22).
- What it gets
Energy surplus or deficit rather than balance, a mean first birth at 27.5 in the United States, grandparents in other cities, and an industrial chemical environment nobody has fully characterized.
- What happens in the gap
Ovulation stops in women who look healthy, obesity disturbs the same loops from the opposite side, sperm counts and testosterone drift downward across cohorts, and the biological window opens and closes on a schedule the social one ignores.
What that chapter recommends
3 of the 5 graded recommendations in Reference topic 32, strongest evidence first. How the grades work.
Keep energy availability adequate
StrongEvidence grade: Strong. Multiple randomized controlled trials, or consistent large cohort studies with a well-understood mechanism.Periods that become irregular or stop during heavy training or dieting signal that intake is not covering output. The disruption can occur without weight loss.
Learn the timeline early, and treat it as planning information
ProbableEvidence grade: Probable. Good observational evidence with a plausible mechanism, or small or few trials.Fertility declines with age in both sexes and more steeply for women after the mid-30s. Anyone thinking about children benefits from knowing that before the decision is urgent.
Aim for a stable, moderate body composition in both sexes
ProbableEvidence grade: Probable. Good observational evidence with a plausible mechanism, or small or few trials.Excess body fat disturbs the same hormonal loops from the other direction, through aromatase activity and insulin signaling. It affects ovulation in women and testosterone and sperm in men.
Related terms
The argument behind this term, its studies and its notes are in Reference topic 32 of the reference library. The book gives the practical version. Get the book.