Oranges contain a compound called D – limonene that has been shown to play an important role in preventing various types of cancer like lung cancer, breast cancer, skin cancer, etc. Additionally, the antioxidants and Vitamin C help promote the body’s immunity which helps in fighting cancer cells. Oranges are highly fibrous fruits, which contributes to its cancer-protecting effect. A study revealed that about 10 to 15 per cent of colon cancer cases are caused by mutations in the DNA. These mutations can prevented by consuming vitamin C rich sources like oranges.