Oranges are good source of Vitamin C. Vitamin C shoots out carcinogens in your body and prevents cancer. Your immune system is fortified by adequate intake of Vitamin C or ascorbic acid. Being an effective antioxidant, Vitamin C prevents oxidative injury to your cells as it wades of harmful oxygen free radicals. Cell damage involving DNA is the initial stage to end up with cancer finally but Vitamin C nips the possibility of cell damage in the bud itself. Your skin is also benefited from Orange. Limonene compound in oranges trigger the immune cells to kill the cancerous cells and stimulates natural detoxification of your body from carcinogens/toxins. Like Oranges in the citrus family, lemons, grapefruit, lemons also have the same potential to fight against cancer and promote healthy body physiology.