Many researchers have studied the link between diet and cancer. Therefore, several studies indicate that there are some foods, which can actually cause cancers of the stomach, breast, mouth, and bowel by influencing their onset and progress. On the other hand, studies show that there are some categories of foods, which play a major role in cancer prevention. Here, it is generally acceptable that a healthy and well balanced diet consisting of fibre, fruits, fish oil (FO) and vegetables can go a long way in terms of reducing the cancer risk. Moreover, the risk of cancer can be reduced by eating diets low in salt, saturated fats, and red/processed meat (Roynette et al., 2004). The main objective of this essay is to highlight the importance of unsaturated fatty acids in cancer prevention.