By: Vive CABA Editorial
For decades, biology taught us that our destiny was written in DNA. It was believed that we were born with a fixed “instruction manual” inherited from our parents and that nothing we did—or failed to do—would change that inheritance for the next generation. However, a revolutionary discipline called Metabolic Epigenetics It is showing that we are much more than our genes: we are the biological echo of our family history.
The memory of hunger and stress
One of the most striking discoveries came from studying the descendants of survivors of major famines and social crises. The scientists noticed something unusual: the grandchildren of people who had experienced extreme hunger were more likely to become obese and diabetic, even if they had always had access to good nutrition.
Why was this happening? The answer was not in a mutation of the DNA, but in its «reading.» Faced with a hostile environment (such as lack of food), the grandparents’ body activated certain chemical «switches» to optimize energy as much as possible. What’s fascinating—and terrifying—is that those switches were left on and passed on to subsequent generations.
The scientific evidence: The historical monitoring of «Hunger Winter» (1944) in the Netherlandscoordinated by the Columbia University and the Leiden Universityrevealed that the grandchildren of women who suffered extreme famine had epigenetic marks in the gene IGF2. This led to an inherited tendency to metabolic disorders, even decades after the crisis ended.
DNA as an open system
For those of us who study human behavior, this is a game-changer. It means that:
- Trauma travels in cells: If an ancestor lived in a state of constant alert, chemical “highlighters” may have silenced genes that calm the stress response, leaving their descendants with a nervous system that “overreacts” to small problems.
- Key information: Investigations of the Dra. Rachel Yehuda in the Icahn School of Medicine at Mount Sinai (New York)showed that survivors of extreme trauma and their children share alterations in the gene FKBP5confirming that post-traumatic stress leaves a heritable chemical fingerprint.
- We are not isolated entities: Our current biology is a record of the shortcomings, fears and also the well-being of those who preceded us. Social precariousness not only affects the present, but leaves a physical «mark» that can travel decades in time.
- Plasticity is hope: Just as stress leaves its marks, healthy environments and well-being can also influence how our genes are expressed. The neurobiologist’s famous rat experiment Michael Meaney showed that offspring whose mothers did not care for them developed epigenetic marks of anxiety. However, if these offspring were given up for adoption to «affectionate» mothers, the marks were erased.
- Key information: This study of the McGill University (Canada)published in Nature Neuroscienceproved that affect has the power to “edit” biology and reverse negative chemical signatures.
We are an ongoing process
This finding reinforces the idea that living beings are open systems. We are not finished at birth. Our nutritional function, our interaction with the environment and even our social crises shape the stuff we are made of.
In Vivewe believe that understanding our biology is the first step to understanding our mental and social health. We don’t just inherit eye color; Sometimes, we inherit the resistance and memory of an entire lineage.
Scientific Sources and References:
- Yehuda, R., et al. (2014). Holocaust Exposure Induced Intergenerational Effects on FKBP5 Methylation. Biological Psychiatry.
- Lumey, L. H., et al. (2007). Cohort Profile: The Dutch Hunger Winter Families Study. International Journal of Epidemiology.
- Weaver, I. C., Meaney, M. J., et al. (2004). Epigenetic programming by maternal behavior. Nature Neuroscience.
