"Epigenetics" is a factor underappreciated by the marketing arms of Big Pharma. The reason... they want an indication they can prove (your genes) to be prima facie evidence that you then take as a CONCLUSION that a certain (no doubt highly expensive) course of treatment is required.

But in reality, when you do analysis past the simplifications that marketing rooms would have you be convinced by, ENVIRONMENT changes everything. And thus you are NOT merely your genes, and you can be, and are, an active participant in your health journey.
 
This is yet another simple example of how established that fact is, both as an interesting point in itself, and as an emphasis of the underlying broader truth*.

Yet separately, how exposure to environmental toxins can change gene expression to the point of being a genetic legacy that is passed down - a child or grandchild of a person exposed to a toxic environment, WITHOUT personal exposure themselves, can carry the epigenetic expression of the person who was exposed.

A point I first read in a great book called "Undoctored", but here are a couple links for the same point: 

Environmental exposures influence multigenerational epigenetic transmission

Environmental Epigenetics and Its Implication on Disease Risk and Health Outcomes



*Not that JOURNALS devoted to the topic don't already prove its fundamental importance.
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