Genetic scientists can show that your genes can mirror your experience. It seems like they can turn on and off based on what your experiences are. For instance, one thing that programs DNA is what you eat. Therefore, obesity can be tied to DNA and DNA can be affected by your food choices. Also, stress has been shown to affect the development of the fetus and is believed to affect its DNA. Therefore, we know that a lower calorie diet and a lifestyle with less stress can help us live longer and it is important to also know that this choice affects us not only at the cellular level but also at the basic programming structure of DNA.