A top doctor doesn't use fitness trackers, but is obsessed with one health metric

wera Rodsawang/Getty Images Measuring our health data with wearable tech is more popular than ever. Dr. Suzanne O'Sullivan tracks her step count, but said healthy people shouldn't buy into other metrics. It's healthier to listen to your body's cues and get checked out if you're worried, she said. Fitness trackers aren't worth your money, a top doctor with 30 years of clinical experience said. However, she does have one exception to this rule: her step count. "I don't have a fitness tracker,...