Why is coffee bad for teenagers?

I am 19 and sometimes drink coffee in the morning, but I have read many health articles saying that it is bad to drink coffee if you're under 21, why?Why is coffee bad for teenagers?
Regularly having a cup in the morning is not a bad thing. If you started drinking 2 or 3 cups every morning then that would be bad probably due to artificially high heart rate conflicting with natural teen energy.Why is coffee bad for teenagers?
Caffeine is a known stimulant. Teens are very physically active by comparison to those in mid twenties etc.


Drinking caffeine before a sports event can increase the heart rate even more and can have negative effects upon the person. Caffeine is also addictive. If at such a young age you begin to drink caffeinated coffee then you will develop a ';need'; for it that can't be satisfied in any other product. An old wives tale is that it also stunts your growth.
';Coffee, the much maligned but undoubtedly beloved beverage, just made headlines for possibly cutting the risk of the latest disease epidemic, type 2 diabetes. And the real news seems to be that the more you drink, the better.';





';Consider this: At least six studies indicate that people who drink coffee on a regular basis are up to 80% less likely to develop Parkinson's, with three showing the more they drink, the lower the risk. Other research shows that compared to not drinking coffee, at least two cups daily can translate to a 25% reduced risk of colon cancer, an 80% drop in liver cirrhosis risk, and nearly half the risk of gallstones.';





The factors contributing to your coffee being ';bad'; for you is mostly outside things you add to it such as sugar.





The ';fact'; that coffee is bad for you is total bullshit. And I drink at least two cups a day %26amp; my teeth are very white. (Rembrant toothpaste FTW).





';There's also some evidence that coffee may help manage asthma and even control attacks when medication is unavailable, stop a headache, boost mood, and even prevent cavities.';








Obviously too much of anything can potentially be harmful, but coffee has proven to have more PROS than CONS. Plus, it is delicious :)
It isn't. I have been drinking coffee since I was 6 or 7 years old. I'm no worse off. Oh wait wait, that explains all my health problems. It was the coffee.
It has been proven that coffe increases your sexual need between the ages of 12-21!!!!! So your still in the process!!!! p.s. use a condom!!!
well my guess is because it makes your heart beat faster but its gross because it makes your teeth yellow and breath smell...kind of like cigs