在快节奏、高压力的今天，孤独、久坐、失眠等正悄然成为影响人们健康的重要因素，它们的危害甚至不比吸烟小。
The growth of social media and waning in-person contact has led Former Surgeon General Vivek Murthy to label loneliness a worldwide epidemic. And it could be lethal.
Julianne Holt-Lunstad, a professor of psychology at Brigham Young University, has found in her research that loneliness reduces people's life spans by the equivalent of smoking 15 cigarettes a day.
Sitting all day increases risk for a raft of different cancers, a 2014 study found.
Researchers included in their meta-analyses data from four million people involving how often they sat to watch TV, do work, and commute.
Each two-hour increase in sitting time upped people's risks for colon, endometrial, and lung cancers, regardless of whether they still exercised during the day.
The Centers for Disease Control and Prevention have called sleep deprivation a public health problem, as some 50 to 70 million people in the US have sleep or wakefulness disorder.
Professor Valery Gafarov, of the World Health Organisation, noted in 2015 that insufficient sleep raises the risk of stroke and heart attack to similar degrees as regular cigarette use.
"Poor sleep should be considered a modifiable risk factor for cardiovascular disease along with smoking, lack of exercise, and poor diet," he said.
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