Is your smartphone making you fat

Cellphones -- also called smartphones -- have become multifunction devices with capabilities similar to an Internet-connected computer. Virtually anywhere and always, users can not only make calls and send texts and emails, but they can interact with Twitter, search the Internet, watch videos and live events, and play video and other games.

Despite the fact that cellphones are mobile devices, they slow people down, Barkley said. Texting on the way to the bus stop, people walk more slowly, trying to do two things at once. Going to the park for a run, they stop to look for messages, check movie times and make a date. Walking past a beautiful scene, they halt and take a photo, and then send it to their friends via Facebook.