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By far soda is the largest source of caffeine intake in children, although it has decreased over the last decade and the increase of energy drinks has increased oh the last decade but soda still far exceeds energy drinks. jenna: when is it safe for kids to consume after -- caffeine? you have kids in high school, drinking coffee and in college, they're drinking coffee. is there an age you reach when caffeine is safe? >> there's not a safe age that they've now said you can consume caffeine drinks. i would say, you know, towards the end of high school. i feel like when you've gun -- gone through ...

Study. dr. garner, why would this help your memory? >> what the caffeine does it inhibits a release of chemicals in the brain and as a result you buildup of good chemicals called dopamine. they improve your memory. it is a memory enhancer. jenna: does it matter how you get the caffeine? we've been talking about coffee. they used tab litts in the study so it was controlled. does it matter what form it is? >> doesn't matter. coffee, tea, or my favorite, chocolate. jenna: are you coffee drinker? do you take caffeine regularly? >> i take decaffinated coffee. i don't know why. it doesn't do anythin...

Likely to die during the course of the 16-year study and we're talking about eight ounce cups of coffee, not the giant drinks that many people like to order. coffee might hurt you by increasing your chances of getting gastrointestinal cancer plus -- >> the stimulant from coffee with caffeine could cause irregular heart rhythms. >> reporter: but, and it's a big but, several other studies have found that coffee is actually good for you, decreasing the likelihood you will get alzheimer's, type 2 diabetes and other diseases. so what's a java lover to do? >> when you smell coffee, you know it's tim...

What do you think we should believe and how much coffee do you think we should drink? >> i think it's hard to say for sure. at least in terms of individual people, i think we need to look at people's symptoms. if you're a coffee drinker and having palpitations or problems with reflux or heart burn, probably need to cut down anyway. we have people with headaches or chronic pain related to caffeine use with large amounts of coffee and i would say it's a good idea to kind of cut down but i definitely think we need to look at why people drink coffee. drinking large amounts of coffee because they d...

Heavy coffee drinker, you might be more at risk to die of any cause, not just heart related problems or something related to digestion. one thing to keep in mind, in an ideal study you look at people noncoffee drinkers and you give them large amounts of coffee to see what happens. this study actually looked at people over the course of 30 years and they didn't actually do that. what they did is look at people already coffee drinkers, heavy coffee drinkers and people who are not and just let them continue with their usual habits so there might be thing that is are different about people who dri...