Yes, what an interesting topic.
I have read that ketchup contains lycopene, which, according to a study, reduces the risk of "prostate cancer up to 34 per cent" if consumed over twice a week as opposed to never.
Ketchup contains more lycopene than tomatoes themselves. Therefore we can conclude that all tomatoes should be replaced by ketchup, and if you want to live forever, most of your diet, should in fact, consist of ketchup. I would suggest about a 4:1 ratio of ketchup to other food.