But this past Tuesday, there was one more reason to rejoice; October 1st marks the fifth annual International Coffee Day. Caffeine is a diuretic, which is the reason chugging a coffee before you drive to the cottage is almost always a bad idea. But, in fact, drinking a cup of coffee is actually equivalent to drinking a cup of water, and people build up tolerance to its diuretic effects over time. Science backs this up—in , researchers at the University of Birmingham confirmed that coffee has no dehydrating effects. But early trials failed, and we were left with plants that contain caffeine as a natural component. Since then, some studies have indicated a possible correlation between coffee consumption and lower calcium intake, but the results are most likely due to subjects drinking fewer calcium-containing beverages. There you go.

Does drinking Mountain Dew cause one's testicles to shrink?
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THE FACTS -- Besides the jitteriness, the insomnia and the prospect of one day beginning each morning in a long line at Starbucks, children have another reason not to drink coffee: it stunts their growth. Or at least according to the old wives' tale that generations of children have grown up hearing. The only problem, it seems, is that after decades of research on the physiological results of coffee consumption, there is no evidence that it has any effect on height. How this myth got started is unclear. But scientists believe it has something to do with caffeine, which for many years was thought to be a risk factor for osteoporosis. That concern stemmed from early studies that associated high intake of caffeinated beverages with reduced bone mass. More recent studies suggest that if there is such an effect, it is both slight and easily offset when dietary intake of calcium is adequate.
How Did This Myth Start?
But is it true: Does coffee stunt your growth? Is there any scientific evidence to back this statement, or is it merely a myth? No, coffee does not stunt your growth. According to the Mayo Clinic , the highest daily caffeine intake that most healthy adults should adhere to is a maximum of mg of caffeine. That equals about four cups of coffee, 10 cans of soda, or 2 energy drinks. But if you feel like you need to cut back or stop drinking coffee, we highly recommend that you consult your doctor.
The first clue to its questionable veracity is the variety of reported effects: Drinking Mountain Dew will shrink your testicles. Or decrease your sperm count. Or cause your penis to grow smaller. Well, whatever occurs, it only happens to guys, and it hits them below the belt, right? The key factor is the presence of a dye called Yellow No. Yellow No.