William Thomas Cain/Getty Images DNA testing can teach you everything from your ethnic background and disease pre-disposition to food preferences and exercise habits. A DNA testing company called Vitagene approached me to take a DNA test for $100, so I swabbed the inside of my cheek and mailed the sample to their lab. I wasn't expecting anything significant, yet the results of my DNA test were a complete shock. A caveat: DNA testing is an imperfect science, and the FDA is only beginning to investigate the claims made by companies like Vitagene. When I was approached to take a DNA test by a company called Vitagene, I was intrigued.