Choose the suitable word to fill in each plank.

Life expectancy in developed countries (21)_______ to increase. In 2004, men could expect to live about 3 years longer than they (22) ________ in 1990. Mortality from heart disease, stroke, and cancer has continued to decline in recent years.Of concern for all is the high prevalence of people with unhealthy lifestyles and behaviors, such as insufficient exercise. and overweight, which are(23) _________ factors for many diseases and disabilities including heart disease, diabetes, hypertension, and back pain. The number of overweight children and adults is increasing. (24) _______ to improve people's health in the 21st century will be influenced by important changes in demographics.

Meanwhile, children and adults in families with income below or near the poverty level have worse health than those with higher income. Poverty(25) ______ poor health by its connection with inadequate nutrition, substandard housing, exposure to environmental hazards, unhealthy lifestyles, and decreased access to and use of health care services.

What is the passage about?