@lioness - This is part true and part false Linda. Here's another link to understand it more;
http://www.center4research.org/lemons-prevent-cancer/
One thing that prevails in the world of medicine concerning food and cancer is that there has not been any research that shows that any food kills cancer cells. If this were the case than a lot of people would not have cancer because they have eaten the food.
Does this make sense?

This reminds me of when I read "miracle cure"- if it's too good to be true, than it isn't.