Key Points
Genetics does not primarily determine mental health challenges.
Interactions between genes and environment significantly influence mental health.
Trauma, chronic stress, and early childhood adversity are major determinants of poor mental health.
We can change gene expression and improve mental health by improving our environment and/or our mindset.
Imagine two genetically identical plants. One is placed on a bright windowsill, watered daily, and enjoys warmth and light. The other is placed in a dark cellar, neglected and forgotten.
After a few days, unsurprisingly, the windowsill plant blooms, while the cellar plant withers—but when you change their environments, their conditions change as well. Same genes. Different results.
This analogy illustrates a key point about mental health: our genetic background doesn’t determine our destiny. Like plants, how we are nurtured or neglected directly impacts our mental well-being.
The End Of Nature And Nurture
Human psychology has long been framed as a debate: nature versus nurture. Do our genes shape our personalities more than our experiences?
Modern science strongly suggests that both nature and nurture play a role, but our experiences often have the greater influence. Mental health problems, such as anxiety and depression, are not primarily determined by genetics. If they were, we would simply be passive recipients of the same psychological stressors that our parents experienced.
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Epigenetic research shows that our biology is constantly evolving in response to our environment. Our genes and brains are flexible, not static, and life experiences profoundly affect our mental health.
What is epigenetics?
Epigenetics is the study of how environmental factors influence our genes, activating and deactivating them throughout our lives. These factors include everything from exposure to toxins and diet to chronic stress and trauma.
Although we are born with a fixed copy of DNA, the way this copy is expressed—that is, how we feel, think, and behave—is unique to how we interact with the world. For example, a 2025 study published in Nature Human Behaviour involving more than 21,000 identical twins found that between 0 and 18 percent of the differences in their mental health traits were attributable to genetic factors, while the vast majority were attributable to life experiences. Furthermore, by modifying our environment and/or how we interact with it, we can reverse epigenetic patterns and improve mental health.
Imagine two other plants: one destined to wither, the other to bloom. The first plant, born to wither, is placed on the windowsill, while the second, born to bloom, is placed in the cellar. Despite their different characteristics, would you be surprised when the windowsill plant blooms and the cellar plant withers? Similarly, if a person’s environment is supportive and reliable, genetic predispositions to mental health problems may not manifest.
Why Context Changes Everything
Without context, we label; with context, we understand. Viewing mental health through the lens of lived experience can be striking. It is ultimately the difference between labeling someone as “ill” and acknowledging their feelings. For example, without knowing the environment of a withering plant, we might judge it as flawed, rather than a natural product of its environment.
Imagine someone with social anxiety who has never been asked about the neglect they experienced as a child. Or someone with depression who has never told anyone they were abused. Without knowing the whole story, we miss a significant part of the “cause” of poor mental health.
It is well-established that trauma and chronic stress are triggers for changes in gene expression associated with depression, anxiety, and schizophrenia. With particular emphasis on the negative effects of adversity in early life, it is natural that trauma-sensitive therapies are gaining popularity.
Unleash Your Healing Power
The good news: You are not flawed; you are human and have experienced hardship. The even better news: You have the power to care for and revitalize your mental health. We are not prisoners of our genes or our life experiences.
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Trauma-sensitive therapies take into account the interplay between genetics and environment. From this perspective, mental health challenges are seen as natural responses to difficult life events. Furthermore, humans are valued for their resilience and ability to recover from circumstances beyond their control.
The findings of neuroplasticity studies support this approach, demonstrating that the brain knows how to form new neural pathways in response to its environment. Through active participation in therapy and lifestyle changes, we can break free from the effects of genetic predisposition and adverse life events. As for the circumstances we cannot change, our brains have the capacity, quite literally, to change how we react to them. Ultimately, our resilience and the success of treatment are due to neuroplasticity.
The formation of your DNA required specific conditions, just as your life experiences have influenced the expression of your genes. Remarkably, how you express yourself in the future may chemically alter these outcomes for the better. Just as a plant thrives on nurturing, so do we. What a wonderful paradox that our capacity for change is one of the few constants of humanity.
