By Kathryn Doyle (Reuters Health) – For young adults on a long-term healthy diet and exercise program, tracking activity with a wearable device may not lead to additional weight loss, according to a new study. Over 24 months, people who used wearable activity trackers lost 2.4 kilograms (5.29 pounds) less than a group on a similar program but using a website to track their progress. “We should not simply tell everyone to go and buy an activity monitor and that it will help them to lose weight,” said lead author John M. Jakicic of the University of Pittsburgh department of health and physical activity.