Harvard Medical School publishes a health letter every year. In 2014, their letter listed five steps that help prevent colorectal cancer. In this post, I will explain three of the five points mentioned. Colon Cancer Prevention 1.Vitamin D Vitamin D is free (it comes from sunshine) and seems to have a protective effect on many diseases. Exposing most of your body to sunshine 10 minutes per day is enough to have good levels of vitamin D. You can have your vitamin D checked by a doctor to discuss possible supplementation. Although it is not clear yet whether vitamin D supplements have the same effect as vitamin D from sunlight, Harvard…