When growing up, there are many new  experiences that shape your likes and dislikes long into the future. One  of the big factors is food. When you have a bad experience with a  certain food or type of food, it changes the expression of your genes.  Whether fish gave you food poisoning or you got sick with the flu after  eating lasagna, that experience can stay with you for a long time and  affect how you feel about tastes and smells. This is just one example of  the way that our day to day lives can actually make changes to our genes.