The New York Times throws cold water on a health fad:
According to Dr. I-Min Lee, a professor of epidemiology at the Harvard T.H. Chan School of Public Health and an expert on step counts and health, the 10,000-steps target became popular in Japan in the 1960s. A clock maker, hoping to capitalize on interest in fitness after the 1964 Tokyo Olympic Games, mass-produced a pedometer with a name that, when written in Japanese characters, resembled a walking man. It also translated as “10,000-steps meter,” creating a walking aim that, through the decades, somehow became embedded in our global consciousness — and fitness trackers.
But today’s best science suggests we do not need to take 10,000 steps a day, which is about five miles, for the sake of our health or longevity.
A 2019 study by Dr. Lee and her colleagues found that women in their 70s who managed as few as 4,400 steps a day reduced their risk of premature death by about 40 percent, compared to women completing 2,700 or fewer steps a day. The risks for early death continued to drop among the women walking more than 5,000 steps a day, but benefits plateaued at about 7,500 daily steps. In other words, older women who completed fewer than half of the mythic 10,000 daily steps tended to live substantially longer than those who covered even less ground.
Another, more expansive study last year of almost 5,000 middle-aged men and women of various ethnicities likewise found that 10,000 steps a day are not a requirement for longevity. In that study, people who walked for about 8,000 steps a day were half as likely to die prematurely from heart disease or any other cause as those who accumulated 4,000 steps a day. The statistical benefits of additional steps were slight, meaning it did not hurt people to amass more daily steps, up to and beyond the 10,000-steps mark. But the extra steps did not provide much additional protection against dying young, either.
I've hit 10,000 steps 139 days in a row, but I have to keep that up through December 31st to tie my record of 312 days. In fact, in the last year, I've hit the goal 345 times, and since getting a Fitbit in October 2014, I've hit the goal 91.4% of the time. Will it kill me to stop after 9,000 steps? No. But it's an easy goal to understand and to work towards.