One-cup of raspberries (123g) provides a top source of fiber, as well as an excellent source of vitamin C and manganese for just 64 calories. This same serving supplies a good source of vitamin K and an abundance of phytochemicals, such as ellagic acid, which research shows may help combat the oxidation - the rust, if you will - of our cells. In fact, a study from the USDA ranked raspberries 10th in total ORAC score out of over 100 common foods. This might help explain why UCLA researchers found that raspberry extract helped inhibit the growth of several kinds of cancers, including oral, breast, colon and prostate.