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By the way, the cancer section on the 60 Minute piece is pretty weak. It's true that some cancers have more insulin receptors but the idea that insulin spikes cause the cancer to grow is still pretty controversial. The guy they talked to didn't offer any proof other than some computer animation.
Besides, sugar (as in sucrose and HFCS) is actually fairly low GI since it made up of about 50% fructose and fructose doesn't enter the blood stream as glucose (it's turned into triglycerides in the liver which are either used for fuel or stored as fat). If high blood sugar spikes are the problem, then reducing starch like potatoes and bread would make more sense than just looking at sugar since they convert more readily to glucose in the blood.
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