As a scientist, I understand the concept of genetic variation. Infact, I spent the majority of my research career uncovering the ways the environment (ie. food) modifies our physiology, by interacting with our DNA (including our genes) and the way these genes are expressed (via epigenetic processes for example, and that’s a whole other story!).
But in my work as a nutritionist, I am somehow still intrigued every time I work with a new client, by how very different they are to my previous client. Or the person before them. It is the complex intricacies of these individuals, their level of activity, current diet and medical history for example, that makes them so very, very individual.