After the age of 30, we all start losing bone mass. What's interesting is that your bones are not fixed structures - your bones are continuously being built, broken down and rebuilt. According to the latest research, genetics, nutrition, environment and lifestyle factors play an important role in determining bone health. Your vitamin D receptor (VDR) gene accounts for around 70% of the entire genetic influence on bone density. It plays an important role in how well your body absorbs calcium from your GUT and how it is used in your body.