We're fast learning how smartphones impact childhood , and the findings of a new study about young tweens on the cusp of adolescence make for some more uncomfortable reading.

Researchers in the US have found that owning a phone at the age of 12 was associated with an increased risk of depression , obesity, and insufficient sleep, compared to not having one.

The iPhone launched less than 20 years ago, so for many kids now entering their teenage years, they've only ever known a world with phones. Studies like this are trying to tease apart the effects.

"Our findings suggest that we should view smartphones as a significant factor in teen health, approaching the decision to give a child a phone with care and considering potential impacts on their life and health," says child and

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