Comment Re:Permanent DST is definitely not the best choice (Score 1) 50
“It’s based on the theory that early morning light is better for our overall health,” Zeitzer said of these endorsements. “The problem is that it’s a theory without any data. And finally, we have data.”
The researchers used a mathematical model to translate light exposure under each time policy, based on local sunrise and sunset times, to circadian burden — essentially, how much a person’s innate clock has to shift to keep up with the 24-hour day.
To link circadian burden to specific health outcomes, the researchers analyzed county-level data from the Centers for Disease Control and Prevention on the prevalence of arthritis, cancer, chronic obstructive pulmonary disease, coronary heart disease, depression, diabetes, obesity and stroke.
For one thing, the researchers didn’t account for many factors that could influence real-life light exposure, including weather, geography and human behavior.
In their calculations, the researchers assumed consistent and relatively circadian-friendly light habits, including a 10 p.m. to 7 a.m. sleep schedule, sunlight exposure before and after work and on weekends, and indoor light exposure from 9 a.m. to 5 p.m. and after sunset. But in reality, many people have erratic sleep schedules and spend more time indoors.
“People’s light habits are probably much worse than what we assume in the models,” Zeitzer said. “Even in California, where the weather is great, people spend less than 5% of their day outside.”
It's perfectly reasonable as a publishing churn paper, but it's a crock of shit if you're trying to use it to inform public debate. Nothing was actually studied. It's a mathematical model that doesn't try to model actual human behavior or account for confounding factors. You can have the result be anything.