https://obgyn.onlinelibrary.wiley.com/doi/10.1002/ijgo.71328
OK so I think it is conception that locks in the ageing trajectory, but:
chatGPT(5.6paidmax):
Overall assessment
Ozdemir and Davutoglu, 2026 is a short narrative review arguing that conditions before and around birth may influence not only particular adult diseases but also the overall pace of biological aging.
The paper is useful as a clinical perspective and research agenda. However, its novelty is mainly in how it packages existing ideas. It does not establish that adverse pregnancy conditions accelerate aging causally or reduce human lifespan. More seriously, there are multiple citation errors that weaken confidence in the review.
Summary
Central argument
The authors extend the Developmental Origins of Health and Disease framework into geroscience. They propose the following sequence:
- Maternal or intrauterine adversity affects fetal development.
- Placental dysfunction, cellular senescence and epigenetic changes preserve a biological record of that adversity.
- These changes reduce organ reserve or alter metabolism.
- The result is accelerated biological aging, earlier chronic disease and potentially reduced longevity.
Proposed mechanisms
The paper identifies three main forms of developmental programming:
- Epigenetic programming through DNA methylation, histone modification and non-coding RNA.
- Predictive adaptation, including the thrifty phenotype, in which fetal metabolism adapts to anticipated scarcity but becomes maladaptive if postnatal nutrition is abundant.
- Structural programming through reduced numbers or impaired development of nephrons, cardiomyocytes, alveoli and pancreatic beta cells.
Evidence reviewed
The Dutch Hunger Winter is presented as the strongest natural experiment. The authors argue that the timing of famine exposure mattered independently of birth weight. They highlight a 2024 study reporting altered DNA methylation aging measures approximately six decades after prenatal famine exposure.
The paper also reviews associations involving:
- Preterm birth and later cardiovascular, respiratory and renal disease.
- Low birth weight and fetal growth restriction with metabolic syndrome and diabetes.
- Maternal preeclampsia and gestational diabetes with offspring cardiometabolic risk.
- Maternal epigenetic age acceleration with preterm delivery.
- Placental telomere attrition, mitochondrial dysfunction and senescence in complicated pregnancies.
- Maternal microbiome differences as possible influences on fetal immune and metabolic development.
Clinical proposals
The authors distinguish current practice from speculative proposals. They support established measures such as prevention and management of preeclampsia, gestational diabetes, nutritional deficiency, smoking and alcohol exposure.
More speculative proposals include:
- Lifelong surveillance of people born very preterm or with severe fetal growth restriction.
- Recording birth history in adult medical records.
- Using perinatal information for adult cardiovascular, metabolic and renal risk stratification.
Novelty
What is reasonably novel
The main contribution is an integrative framing that combines:
- Fetal development.
- Maternal biological aging.
- Placental senescence.
- Epigenetic aging measures.
- Microbiome-mediated programming.
- Lifelong preventive medicine.
It also brings the recent Dutch famine epigenetic-clock study into an obstetric review and explicitly proposes that birth records could become part of adult longevity risk assessment.
What is not novel
The underlying thesis is well established. Earlier literature had already addressed:
- The developmental origins of aging.
- Early-life nutritional programming of longevity.
- Placental programming of chronic disease and lifespan.
Examples include the Dutch famine developmental-aging protocol from 2013, Barker and Thornburg’s 2013 review of placental programming and lifespan, and Vaiserman’s 2014 review of early-life nutritional programming of longevity.
Therefore, the novelty is moderate as a synthesis but low as a new biological theory. The paper contains no new data, meta-analysis or experimentally validated mechanism.
Strengths
- It communicates a complex life-course argument clearly.
- It emphasizes that gestational timing can matter independently of birth weight.
- It distinguishes physiological placental senescence at term from premature pathological senescence.
- It acknowledges residual genetic, socioeconomic and postnatal confounding.
- It labels the proposed lifelong surveillance programmes as expert opinion rather than established care.
- Its proposal to make birth history available in adult health records is practical and testable.
Critique
1. Disease risk is not the same as accelerated aging
Most of the evidence concerns individual diseases, organ development or relative mortality in young adulthood. These findings support developmental effects on adult health, but they do not demonstrate a generalized increase in the rate of aging.
Likewise, epigenetic-clock acceleration, telomere length, cellular senescence and reduced organ reserve are different measurements. The paper combines them into one biological-aging pathway without showing that they measure the same process or mediate one another.
No cited intervention has yet shown that improving the intrauterine environment slows offspring aging or extends offspring lifespan.
2. The Dutch famine evidence is presented too strongly
The 2024 study used a single blood sample at approximately age 58. DunedinPACE was faster in exposed participants, GrimAge showed a smaller difference, and PhenoAge showed no difference. Effects were strongest in women and close to zero in men. These important qualifications are not conveyed in the review’s description of broadly accelerated biological aging. Cheng et al., PNAS 2024
A one-time methylation score estimating pace of aging is not a directly observed six-decade aging trajectory. Repeated measurements and subsequent morbidity and mortality follow-up are needed.
3. Maternal epigenetic-age evidence is selectively presented
The highlighted AgeAccelGrim study involved only 163 women already at high risk of spontaneous preterm birth. Nearly half delivered preterm, so its large odds ratios should not be generalized to ordinary pregnancies. Actual Gascoigne study
The review omits important counterbalancing evidence available before its June 2026 search cut-off:
- A Filipino replication study found 29 of 30 tested associations between maternal epigenetic clocks and birth outcomes were not significant. Ryan et al., 2022
- A much larger Norwegian study of 2,198 mothers and 2,193 fathers found maternal associations with slightly shorter gestation and spontaneous preterm birth, but no association with small-for-gestational-age birth or preeclampsia. The differences in gestation were generally less than one day per standard deviation of age acceleration. Magnus et al., 2024
The total evidence is therefore mixed and considerably less dramatic than the review suggests.
4. There are serious citation problems
Several claims are linked to the wrong papers:
- Reference 15 is a study of preterm birth and chronic kidney disease, but it is cited for the hazard ratio of 1.89 for cerebrovascular disease. That result actually comes from Ueda et al., 2014, which is absent from the reference list.
- Reference 21 examines progression to type 2 diabetes in women who previously had gestational diabetes. It does not support the table’s claim about metabolic syndrome and obesity in their offspring. Vounzoulaki et al., 2020
- Reference 26 gives an incorrect title, journal and publication record for the maternal epigenetic-age study. The article number 100658 actually belongs to an unrelated progesterone meta-analysis. Boelig et al., 2022
- Reference 10 is an epigenetic-clock study, not a telomere study, yet it is used to support claims about shorter telomeres and reduced telomerase capacity.
- Reference 11 found persistent IGF2 methylation differences in people directly exposed to famine in utero. It did not study their descendants and therefore does not demonstrate transmission across subsequent generations. Heijmans et al., 2008
- References 22, 25 and 27 also misidentify or reorder the principal authors. The placental-aging systematic review, for example, was led by Anna Kajdy rather than Sebastian Kwiatkowski.
These are not merely formatting defects. They make some central claims difficult to verify and suggest inadequate bibliographic checking.
5. The review methodology is too weak for its conclusions
Although the search is described as structured, the paper provides:
- No complete search strings.
- No study-selection flow.
- No inclusion or exclusion criteria.
- No evidence grading.
- No formal risk-of-bias assessment.
- No explanation of how conflicting studies were handled.
Only 28 references are used to cover fetal programming, prematurity, fetal growth restriction, maternal disease, placental senescence, microbiomes and aging. Important search terms such as microbiome, low birth weight, small for gestational age, lifespan, longevity and paternal factors are absent from the stated strategy.
6. Important clinical categories are conflated
Low birth weight, small for gestational age and fetal growth restriction are overlapping but distinct:
- Low birth weight is an absolute weight threshold.
- Small for gestational age is a population percentile.
- Fetal growth restriction implies pathological failure to reach growth potential.
Combining them can mix constitutionally small healthy infants with placental disease and preterm delivery.
Similarly, preterm birth is an outcome with many causes, including infection, inflammation, placental insufficiency, cervical dysfunction and medically indicated delivery. It is not itself an intrauterine exposure, as Figure 1 implies.
7. Some mechanistic language is too categorical
The claim that structural consequences are “permanent” is too strong. Organ deficits can be persistent, but later remodeling, compensation and postnatal exposures influence their clinical expression.
The statement that no nephrons form after birth is correct for normal term infants but needs qualification for preterm infants, in whom limited and frequently abnormal nephrogenesis can continue after delivery. Sutherland et al., 2011
Placental senescence and maternal epigenetic age may also be consequences or biomarkers of pregnancy pathology rather than upstream causes. The review does not establish the direction of causation.
8. Clinical implications exceed the evidence
Routine lifelong multi-organ surveillance might ultimately be valuable, but the paper provides no evidence that such programmes improve outcomes, are cost-effective or outperform risk assessment based on current adult measurements.
Established obstetric interventions improve maternal, fetal and neonatal outcomes. That does not yet mean they increase offspring longevity. The conclusion that the intrauterine environment is an actionable lever for improving population longevity should therefore be presented as a hypothesis, not an evidence-based result.
Bottom line
The strongest defensible conclusion is:
Adverse prenatal and perinatal conditions can have persistent effects on organ reserve and adult disease risk, and may also leave detectable signatures in some aging-related biomarkers.
The paper does not yet justify the stronger conclusion that the womb determines the pace of aging or longevity. Its integrative framework is worthwhile, but it should be treated as hypothesis-generating. The selective treatment of conflicting evidence and the substantial citation inaccuracies materially reduce its reliability as a scholarly review.
Q2: is the paper in conformance with the hypothesis that the ageing trajectory starts at conception
Short answer
Yes. The paper is broadly consistent with the hypothesis that the aging trajectory starts at conception, but it does not prove it.
The paper’s model is that conditions operating from early embryonic and fetal development establish the individual’s starting biological state through:
- Epigenetic programming.
- Placental function.
- Mitochondrial function and cellular senescence.
- Organ-cell endowment, including nephrons and cardiomyocytes.
- Metabolic adaptation to maternal nutrition.
- The initial setting of telomere length and other aging-related markers.
These factors could determine organ reserve and influence the subsequent rate at which disease and functional decline emerge.
Important distinction
The evidence supports the proposition that determinants of later aging begin around conception. It does not necessarily show that aging itself, meaning progressive deterioration, begins at conception.
Embryonic development is predominantly a process of growth, differentiation and increasing functional capacity. It may nevertheless establish:
- The initial amount of damage or biological reserve.
- Vulnerability to future damage.
- Long-term patterns of gene regulation.
- The response to nutrition, inflammation and metabolic stress.
- The point from which post-developmental decline begins.
A more precise formulation would therefore be:
The biological trajectory that influences aging and longevity begins at conception, even if measurable functional aging begins later.
What the paper does not demonstrate
The paper does not:
- Measure biological aging repeatedly from conception onwards.
- Show that embryonic epigenetic changes persist continuously into old age.
- Establish that placental senescence causes accelerated aging in the offspring.
- Demonstrate that improving prenatal conditions slows later aging or extends lifespan.
- Consider conception-specific factors such as gamete quality, paternal biology, early embryonic epigenetic reprogramming or mitochondrial inheritance in sufficient depth.
Its principal epigenetic evidence is a biological-age measurement made at approximately 58 years of age after prenatal famine exposure. That demonstrates a possible long-term association, not the trajectory between conception and age 58.
Conclusion
The paper strongly endorses a developmental-origins version of your hypothesis:
Conception and fetal development establish the initial conditions, biological reserves and regulatory settings that help determine the later aging trajectory.
However, the evidence is more secure for prenatal programming of adult disease susceptibility than for prenatal determination of the generalized pace of aging. The paper is therefore hypothesis-conforming and hypothesis-generating, but not hypothesis-confirming.