We may never understand illnesses such as cancer. In fact, we may never cure it. But an ounce of prevention is worth more than a million pounds of cure.

Cancer is the ultimate nemesis that hangs in the balance for one in three women and one in two men in their lifetime.

I'm a big believer in what's called personalized medicine, which refers to customizing your health care to your specific needs based on your physiology, genetics, value system and unique conditions.

I believe we can prevent or delay most disease until the 9th or 10th decade. The goal is to prevent anything that can affect your quality of life prior to those years! By the time many of us get to the 9th or 10th decade, who knows where the new medical and science will take us? I am an optimist!

We have forgotten that curing cancer starts with preventing cancer in the first place.

We all need to figure out what's right for us because nothing about life is one size fits all. Even for an Olympian, that's for sure. And such discovery starts with you paying attention - to yourself.

If your DNA profile puts you at a higher risk of developing obesity, that doesn't mean it's your fate. You can take control of the environmental side of the equation and reduce your overall lifetime risk by a lot.