Why Chronic Disease May Begin Before Birth | Leslie Stone, Kalea Wattles & Emily Stone Rydbom

The clinical focus of modern medicine is undergoing a profound paradigm shift as researchers and practitioners increasingly link chronic disease trajectories to the period before conception. Recent discussions within the functional medicine community, led by Dr. Kara Fitzgerald, Dr. Leslie Stone, Emily Stone Rydbom, and Dr. Kalea Wattles, highlight that the biological window for influencing lifelong health opens long before a positive pregnancy test. This movement, rooted in the Developmental Origins of Health and Disease (DOHaD) framework, argues that metabolic health, immune function, and neurodevelopment are dictated by a complex interplay of epigenetics, maternal nutrition, and environmental exposures during the preconception phase.

The Rising Crisis in Reproductive Health

Despite significant advancements in medical technology, the global landscape of reproductive health is currently facing a dual crisis. Infertility rates are climbing steadily, and at the same time, rates of maternal morbidity and mortality are reaching concerning levels, even in highly developed nations. According to public health data, the United States currently reports the highest rate of preterm birth among developed countries, with severe disparities linked to socioeconomic status and geography.

This trend is not isolated to the immediate pregnancy experience. Medical experts note a "feed-forward" cycle where maternal health conditions—such as chronic hypertension, which has doubled in pregnancy cases over the last fifteen years—directly correlate to adverse outcomes for the offspring. These infants are at a significantly higher risk of experiencing their own metabolic and cardiovascular complications as they age, effectively creating a multi-generational cycle of chronic disease.

The Role of Epigenetics and Developmental Biology

The scientific community is increasingly focusing on the imprintome—a biological system that dictates which parent’s copy of critical genes is expressed or silenced. Research, including studies published in journals such as Frontiers, demonstrates that this process is highly dependent on one-carbon metabolism and methylation. Because the imprintome is established during the very early stages of development, its modifiability is greatest during the preconception window.

This period represents a "resiliency set point." If a mother experiences high allostatic load—a state of chronic stress that impairs mitochondrial function—the biochemical instructions for the developing fetus may be negatively impacted. Conversely, targeted interventions during this time, focusing on precision nutrition and environmental safety, can potentially "program" the fetus for better health outcomes, reducing the risks of neurodevelopmental issues and chronic inflammatory diseases later in life.

Clinical Innovation: The Grow Baby Model

The Grow Baby care model, founded by Dr. Leslie Stone and Emily Stone Rydbom, serves as a primary example of how to bridge the gap between obstetric care and precision nutrition. By integrating functional medicine into traditional obstetric practices, the model seeks to address micronutrient deficiencies and metabolic imbalances before they become clinical issues.

The results of their clinical implementations have been notable. In an initial cohort of 402 patients across diverse demographic and socioeconomic backgrounds, the program reported a significant reduction in adverse outcomes. The incidence of preterm birth was drastically lowered, gestational diabetes mellitus was reduced by approximately 90%, and longitudinal follow-ups showed a marked decrease in atopic conditions, such as eczema and allergies, among the offspring.

The model is designed to be scalable and accessible. Rather than relying on expensive or exclusive resources, the program utilizes locally available, culturally appropriate foods that align with standard SNAP and WIC nutritional guidelines. This approach has gained traction among managed care organizations (MCOs), which are increasingly recognizing that the long-term cost savings associated with preventing preterm birth and chronic illness outweigh the upfront costs of prenatal nutritional intervention.

Functional Fertility and Systems Thinking

Parallel to the work in obstetric settings, Dr. Kalea Wattles has developed the "Functional Fertility" framework to address the rising rates of unexplained infertility. By utilizing a systems-based approach, practitioners can move away from the frustration of an "unexplained" diagnosis toward a mechanistic understanding of the patient’s health.

Common drivers identified in this model include insulin resistance, thyroid dysfunction, and chronic systemic inflammation. For example, hyperinsulinemia is known to trigger the ovaries to overproduce androgens, which in turn inhibits proper egg development. By using specific biomarkers—such as hsCRP, fasting insulin, and uric acid—clinicians can map a patient’s health to "Fertility Focus Zones." This diagnostic hierarchy allows for targeted, cost-effective interventions that address the root cause of reproductive dysfunction rather than merely treating the symptoms.

Implications for Public Health and Longevity

The implications of this research extend far beyond the nine months of pregnancy. By viewing the reproductive years as an essential window for health span optimization, clinicians are beginning to see how preconception care functions as a pillar of preventive medicine.

Experts argue that the "preconception" timeline should be redefined. Rather than focusing only on the few months before a planned pregnancy, clinicians should consider the reproductive years in their entirety, potentially starting as early as puberty. This shift encourages the adoption of healthy lifestyle patterns that protect mitochondrial integrity and reduce inflammatory burdens throughout the entire life cycle.

As the ROOT Study in North Carolina—a large-scale, 500-pregnancy research initiative funded by state health departments—begins to collect data, the medical community expects to gain a more definitive understanding of how these interventions affect long-term pediatric outcomes. This study marks a milestone in the institutional acceptance of functional medicine, as it utilizes taxpayer-funded infrastructure to test the efficacy of holistic, personalized care in real-world settings.

Moving Forward

The consensus among leading functional medicine practitioners is that the current model of reactive, symptom-based medicine is insufficient to combat the modern epidemic of chronic disease. By shifting the focus toward the earliest possible developmental stages, the medical establishment has the opportunity to reduce the burden of disease for both the mother and the next generation.

As diagnostic tools become more sophisticated—including the use of AI-assisted care and advanced genomic testing—the ability to personalize these interventions will only increase. The challenge for the future lies in policy integration and physician education. To successfully implement these changes, the healthcare system must evolve to support the "pay-it-forward" model of prevention, where current investments in maternal and reproductive health are recognized as the most effective strategy for ensuring the long-term vitality of the population.

For now, the growing body of evidence suggests that the most effective way to address the chronic diseases of adulthood may indeed be to start at the very beginning, ensuring that every pregnancy and every child has the benefit of a resilient, nourished, and biologically optimized foundation.