I have never believed that I was limited by my genetics, nor that I could not change my genetics. At last, epigenetics is beginning to prove that very fact: You are not your DNA, but you are responsible for it.
Our genetic makeup is influenced by our environment and those influences are inherited by our great-grandchildren. This makes complete sense! We know humans are very adaptable, so why wouldn't our bodies learn from not only our environment, but also from the effects the environment had on our ancestors? The only way for humans to maintain this adaptability through generations would be to inherit the effects the environment had on our ancestors.
Diabetes, cancer, autism, alzheimer's, obesity -- I believe with time we will discover that all of these are a direct cause-and-effect result of changes made to our epigenome by our diet and environment (including those changes inherited).
I also believe that each and every one of us is capable of curing any biological ailment (caused by our individual actions or inherited from our ancestors) by modifying our diet, environment, and thought processes. Additionally, I believe that collectively, this healing power can be amplified without limit.
Imagine a super-human. Someone with the ability to heal not only themselves, but others as well. Imagine a human who had the power to become anything or anyone he or she ever wanted. That person is you.
Read DNA is not Destiny by Ethan Watters and see how it changes your view of genetics.