The expression of the majority of our genes, also known as epigenetics, can be altered based on our environment, our diets, our mental attitude, and our fitness. Meaning, you can activate genes that can be harmful to you or you can make those harmful genes become dormant (inactive). Now the cogwheels are probably turning in your head thinking “if I can change the expression on 70-90% of my genes, how do I activate the good genes and deactivate the bad ones?”
The environment in which you live, your thoughts, and the things you do in your life is what can either make the positive or negative changes in your genetic expression. Almost anything can change the expression but here’s a list to get you started.