4. Infertility affects about 6% of married women ages 15-44 years in the U.S. Also, about 12% of women 15 – 44 years of age in the U.S. have difficulty getting pregnant or carrying a pregnancy to term, regardless of marital status. Infertility is defined as not being able to get pregnant after one year of unprotected sex. Several things increase a woman’s risk of infertility, including age, smoking, excessive alcohol use, extreme weight gain or loss, some untreated sexually transmitted diseases, or excessive physical or emotional stress that results in the absence of a menstrual period.
Focusing more on lifestyle issues and their relationships with functional health, data from the Alameda County Study suggested that people can improve their health via exercise, enough sleep, maintaining a healthy body weight, limiting alcohol use, and avoiding smoking. Health and illness can co-exist, as even people with multiple chronic diseases or terminal illnesses can consider themselves healthy.
Health, as defined by the World Health Organization (WHO), is "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity." This definition has been subject to controversy, as it may have limited value for implementation. Health may be defined as the ability to adapt and manage physical, mental and social challenges throughout life.