You can decrease your chances of getting cancer by as much as 40% by eating a healthier diet. Some foods are cancer promoters whilst several others actually prevent and help fight cancer. Over the past 50 years our diet has significantly changed: not only is the food we eat different but also the way we produce it.We tend to follow a diet rich in animal proteins, high glycemic index food (sugar and white flour) and hydrogenated trans fats, all of which increase inflammation and cancer risk.