Sleep is an essential component to maintaining health. In children, sleep is also vital for growth and development. Ongoing sleep deprivation has been linked to an increased risk for some chronic health problems. In addition, sleep deprivation has been shown to correlate with both increased susceptibility to illness and slower recovery times from illness. In one study, people with chronic insufficient sleep, set as six hours of sleep a night or less, were found to be four times more likely to catch a cold compared to those who reported sleeping for seven hours or more a night. Due to the role of sleep in regulating metabolism, insufficient sleep may also play a role in weight gain or, conversely, in impeding weight loss. Additionally, in 2007, the International Agency for Research on Cancer, which is the cancer research agency for the World Health Organization, declared that "shiftwork that involves circadian disruption is probably carcinogenic to humans," speaking to the dangers of long-term nighttime work due to its intrusion on sleep. In 2015, the National Sleep Foundation released updated recommendations for sleep duration requirements based on age and concluded that "Individuals who habitually sleep outside the normal range may be exhibiting signs or symptoms of serious health problems or, if done volitionally, may be compromising their health and well-being."
Usage Note: Some people insist on maintaining a distinction between the words healthy and healthful. In this view, healthful means "conducive to good health" and is applied to things that promote health, while healthy means "possessing good health," and is applied solely to people and other organisms. Accordingly, healthy people have healthful habits. However, healthy has been used to mean "healthful" since the 1500s, as in this example from John Locke's Some Thoughts Concerning Education: "Gardening ... and working in wood, are fit and healthy recreations for a man of study or business." In fact, the word healthy is far more common than healthful when modifying words like diet, exercise, and foods, and healthy may strike many readers as more natural in many contexts. Certainly, both healthy and healthful must be considered standard in describing that which promotes health.
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The private health system in Australia operates on a "community rating" basis, whereby premiums do not vary solely because of a person's previous medical history, current state of health, or (generally speaking) their age (but see Lifetime Health Cover below). Balancing this are waiting periods, in particular for pre-existing conditions (usually referred to within the industry as PEA, which stands for "pre-existing ailment"). Funds are entitled to impose a waiting period of up to 12 months on benefits for any medical condition the signs and symptoms of which existed during the six months ending on the day the person first took out insurance. They are also entitled to impose a 12-month waiting period for benefits for treatment relating to an obstetric condition, and a 2-month waiting period for all other benefits when a person first takes out private insurance. Funds have the discretion to reduce or remove such waiting periods in individual cases. They are also free not to impose them to begin with, but this would place such a fund at risk of "adverse selection", attracting a disproportionate number of members from other funds, or from the pool of intending members who might otherwise have joined other funds. It would also attract people with existing medical conditions, who might not otherwise have taken out insurance at all because of the denial of benefits for 12 months due to the PEA Rule. The benefits paid out for these conditions would create pressure on premiums for all the fund's members, causing some to drop their membership, which would lead to further rises in premiums, and a vicious cycle of higher premiums-leaving members would ensue.
The surviving infant remains healthy and will be closely monitored by Zoo personnel. — Katherine J. Wu, Smithsonian, "National Zoo Reports Death of Infant Golden Lion Tamarin," 2 July 2018 That often pushes aside the basic building blocks of a healthy life, such as proper sleep, exercise, and nutrition. — Clay Marsh, STAT, "Facing deaths of despair from the depths of despair in West Virginia," 12 July 2018 Findings of the study showed 8.2 million years of healthy life were lost due to diabetes attributable to air pollution in 2016 globally. — Hannah Holzer, sacbee, "Air pollution increases risk for type 2 diabetes, study finds," 12 July 2018 Children learned about biker safety and living healthier lives. — Dennis Hohenberger, Courant Community, "Children Learn Bike Safety," 3 July 2018 Our mission has always been to help people live healthier lives. — Carolyn Kylstra, SELF, "How Should a Health Brand Talk About Weight?," 25 June 2018 This process should bring us a step closer to what really matters: informing people who want to know how to eat for a healthy life. — Julia Belluz, Vox, "This Mediterranean diet study was hugely impactful. The science just fell apart.," 20 June 2018 Many say that being involved in different activities has made them happier and healthier. — City Bureau, Chicago Reader, "These candid photos capture how seniors are growing communities—while growing older—on the south side," 12 July 2018 All the activities are monitored by Nicklaus pediatric endocrinology nurses to ensure a safe and healthy environment, according to a news release. — Emily Himes, miamiherald, "Diabetic children learn about nutrition and keeping healthy at Camp Roaring Sun," 10 July 2018