Most Americans have heard that they should drink eight glasses of water a day to stay hydrated, but there is surprisingly little data to support this advice. But now, a new “beverage hydration index” provides evidence-based suggestions for how to most efficiently hydrate. The index was developed from a British study published in December that tracked how long 13 common beverages remain in the body after being consumed. “In the last 25 years, we’ve done many studies on rehydration...…Most Americans have heard that they should drink eight glasses of water a day to stay hydrated, but there is surprisingly little data to support this advice. But now, a new “beverage hydration index” provides evidence-based suggestions for how to most efficiently hydrate. The index was developed from a British study published in December that tracked how long 13 common beverages remain in the body after being consumed. “In the last 25 years, we’ve done many studies on rehydration...WW…

Sharon Gayter’s closely monitored world record reveals insights on marathon fueling, pacing, and strategyOutside's long reads email newsletter features our strongest writing, most ambitious reporting, and award-winning storytelling about the outdoors..In November 2017, , a 54-year-old British ultrarunner, completed ten marathons in ten days on a treadmill, with a combined time of 43 hours 51 minutes 39 seconds, breaking the former Guinness World Record by more than two hours. What’s important about Gayter’s feat now—besides being an impressive mark —is that she ran all ten marathons in the...…Sharon Gayter’s closely monitored world record reveals insights on marathon fueling, pacing, and strategyOutside's long reads email newsletter features our strongest writing, most ambitious reporting, and award-winning storytelling about the outdoors..In November 2017, , a 54-year-old British ultrarunner, completed ten marathons in ten days on a treadmill, with a combined time of 43 hours 51 minutes 39 seconds, breaking the former Guinness World Record by more than two hours. What’s important about Gayter’s feat now—besides being an impressive mark —is that she ran all ten marathons in the...WW…