The effects of diet on cancer remain largely understudied, but early research has shown that one fruit, purported to have medicinal qualities, might slow the spread of the disease. Other research suggests it may enhance the performance of traditional therapies, or selectively kill several types of cancer cells. Doctors, however, have advised against its use in cancer prevention due to a lack of research on humans.
Graviola or soursop comes from the trees of rainforests in Africa, South America and Southeast Asia; the fruit’s pulp is used widely in juices, and smoothies. According to WebMD: "Soursop is high in vitamin C, and antioxidants known to boost immune health." Research shows it strengthens the immune system by improving the ability to defend against pathogens and promoting the destruction of free radicals.
Some studies have studied the effects of the fruit on cancer, suggesting it may help selectively kill malignant cells.
Source: express.co.uk