Are you doomed by your genes? Not according to epigenetics, the science of how our environment selects, modifies and regulates gene activity. We can, through environmental factors including nutrition, lifestyle, what we do, think, perceive (real or imagined), believe and feel, change how certain parts of our DNA blueprint are read and implemented – or not. So you are not a victim of heredity. You can modify your epigenetic activity.
For example, identical twins having identical genes can be very different people including health wise, even though they may have genes that equally predispose them to certain health problems, from obesity to cancer.