17. Consume enough vitamin D. Working with calcium, this vitamin helps keep bones strong. In addition, many studies have looked at its potential to reduce the risk of everything from some common cancers and multiple sclerosis to diabetes, hypertension, and age related muscle weakness, especially in the lower legs. The RDA is 200 to 600 IU of vitamin D a day, but 800 to 1,000 IU is a better target for everyone. Most people need to take supplements to meet this goal.
