Excess insulin production from eating too much sugar/carbs is one problem, as the article discusses (plus you get type 2 diabetes as bonus).
Also, a key factor in reducing cancer is likely autophagy - the process by which the body cleans out and remove old cells and replaces them with new cells. One way to increase autophagy is via intermittent fasting. This doesn't mean going for days without eating, just around 16 hours, with an 8 hour period of eating per day. Again, we were led down the wrong road by those insisting we should "graze" and continuously eat (sugar filled junk food, at that).