The Western world's leading cause of early death is ______.

A．people who suffer high mortality
B．people who take little exercise
C．people who walk 40 miles a week
D．people who have a lower rate of heart disease

A．A diet that is sugar free but nutrient-rich.
B．A diet that is sodium free but vitamins-rich.
C．A diet that contains a lot of potassium and calcium.
D．A diet that consists of low-fat meat and fresh plants.