Learn about other mood disorders » . Between 4 and 6 percent of the U.S. population suffers from SAD . The study found that people with SAD have a lower level of physical activity than those without SAD; they also tend to be less physically active in general. Recent research indicates genetic component to the condition .
Between 4 and 6 percent of the U.S. population suffers from SAD . The study found that people with SAD have a lower level of physical activity than those without SAD; they also tend to be less physically active in general. Recent research indicates genetic component to the condition .