this is a great in depth description of the lemon and lime, its benefits, its history, and how it can fight cancer. here is a brief quote. this is a great site, it gives the nutritional rundown on many many different foods.
"Several other fascinating research studies on the healing properties of lemons and limes have shown that cell cycles - including the decision a cell makes about whether to divide (called mitosis) or die (apoptosis) – are altered by lime juice, as are the activities of special immune cells called monocytes."