flavors & colors, pink slime... no problem ! a poster named Laura Ann wrote on the company's Facebook page. But in no way should we be allowed the right to know our own genetic material as a means for making better decisions about our health. In a statement, 23andMe said it has received the FDA's letter and will be working to address the agency's concerns. There are more than 3 billion letters in our genetic code. Though it's been 10 years since the Human Genome Project was completed, scientists still do n't understand what every gene does, and what a mutation might mean for someone's health. It's one of the issues opponents to home genetic testing kits raise most often. If DNA experts do n't understand 100 % what a gene mutation means, how can we expect consumers to ? 5 cool things DNA testing can do Scientists have identified more than 2,000 single gene disorders, says Rebecca Nagy, president of the National Society of Genetic Counselors. These are disorders that can be diagnosed based on the mutation of a single gene in the body; some examples include Huntington's disease or cystic fibrosis. But conditions such as Type 2 diabetes or Alzheimer's are more complex. Hundreds of genes may contribute to the development of these diseases, Nagy says, and a person's risk is also influenced by his or her environment. Testing for markers of risk scattered across someone's genome is