We spoke with a pair of cousins, one an Army veteran, the other a current member of the Navy, about some of the toughest situations they've found themselves in. Army basic training, according to Mates, is all about discipline. It's about knowing your role and not stepping out of line. And if you do, well, you pay a price. Mates said, In basic training, they call it 'getting smoked.' Push-Ups until you puke. I was always getting smoked.
Caffine is the most popular and probably the most studied of all drugs, and serious adverse effects in real life have resisted demonstration. There are pop claims about caffeine interfering with absorption of iron and vitamin d; if there were any real effect on real human beings, it would be obvious by now.
I used to LIVE on Vitamin Water a couple of years ago. I haven't been drinking it since I got pregnant, just because I feel like it's better to be safe than sorry. Careful, too, because at least one of the flavors (I think it may be the citrusy Energy, if not others) contains caffeine.