Tuesday night on FOX Business Network — a great network, by the way, I hope you demand your cable company provide it, but I digress — Tuesday night, I had a doctor on from a company called Navigenics that has the ability to literally map your DNA.

Your body blueprint, if you will.

Down to every possible thing that could go wrong with you. Cancer, at its earliest stages. Potential cardiovascular issues, long before they're issues.

Good to know, but scary too. Because this technology also can give you a pretty good idea what someday might kill you — even when.

Would you want to know that?

Imagine undergoing this test and finding you have the marker for Lou Gehrig's disease — always fatal.

What if you knew that ahead of time? That all this saving for your older years would be a waste? Would you live it up now or wallow now?

Some big ethical issues there — to say nothing of bosses and insurance companies. If they got wind that you might be pre-disposed to some bad health stuff, what do you think they'd do?

I worry about that. As I worry about looking into a crystal ball and potentially seeing how it's all going to end.

It's not that I don't want to know what's coming. I guess it's just that i don't want to take my focus off something else: Living.

Watch Neil Cavuto weekdays at 4 p.m. ET on "Your World with Cavuto" and send your comments to cavuto@foxnews.com

Neil Cavuto serves as senior vice president, anchor and managing editor for both FOX News Channel (FNC) and FOX Business Network (FBN). He is anchor of FNC's Your World with Cavuto - the number one rated cable news program for the 4 p.m. timeslot - as well as the FNC Saturday show Cavuto on Business. He also hosts Cavuto on FBN weeknights at 8 p.m. In addition to anchoring daily programs and breaking news specials on FNC and FBN, Cavuto oversees business news content for both networks and FNC's weekend business shows, including Bulls & Bears, Forbes on Fox, and Cashin' In. Click here for more on Neil Cavuto.