SAN ANTONIO — The school year is underway and that means kids' brains are back to the books after weeks of summer vacation.

Some of those summer hours might have been spent in front of TVs, tablets or cell phones as digital leisure continues to dominate attention spans. Experts say increased screen time doesn't only affect students' mental health, but their physical health too.

Researchers have found that because of increased screen time and less sleep, heart health risks in children and teens is on the way up.

"Nowadays, kids are spending a lot more time indoors and just in front of the screen," said Cardiologist Dr. Fahmi Farah . "So yes, certainly it is a very sedentary lifestyle and those can have detrimental impact in the long term."

The American Heart Association says heart

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