I frequently hear that beverages with caffeine or alcohol are not good for replenishing fluids and preventing dehydration. But in reality aren't they just a bit less effective at hydrating your body than other beverages? In other words, if you were stuck in the desert with nothing to drink but beer, coffee and cola, would you actually be worse off and die of thirst sooner if you drank these beverages versus not drinking anything at all?

I know that it is extremely dangerous to mix viagra (or other ED drugs) and poppers (amyl nitrate), and that one should wait for 24 hours after using viagra (to let it get out of your system) before using poppers. My question is what is the waiting period after using poppers before it is safe to use viagra? In other words, how long before the physiological effects of poppers wear off?

Why is beta-carotene dangerous for smokers?

Do any alcohols have any specific benefits? As in, is tequila better than vodka? And is red wine the best choice because of its antioxidants?

I really want to try pot because I am SICK of being uptight and careful all the time. I have been depressed and anxious for several years and I just want to feel SOMETHING different. But I've had a couple of panic attacks (both related to medication) and they were the most frightening things I've ever experienced. I'm scared that pot would do the same thing to me. What do you think? I know you can't encourage me to smoke pot but I would very much appreciate an honest answer, which I know you always give. (I know that smoking pot is not the best thing to do when you have depression and anxiety, but it would only be once, and I would be with friends. By the way, I'm not currently on medication as I find it useless. But I'm not trying to self-medicate. I just want to remember what it's like to experience an emotion that is not depression or anxiety). Thank you very much.

1) I have had acid coming up my throat from my stomach for the last 3 weeks. It comes up and just burns my throat. What is it? Do I have an ulcer? By the way, I get 3 hours of sleep a night, and my roommate doesn't help the situation.

2) I have recently asked you about my would be ulcer. I shall pose the question again. Lately I have this damn acid coming up my throat. I've been under a lot of stress and have strange sleeping habits. I am also drinking a lot of coffee. I drink about 5 cups of coffee a day and my roommate isn't exactly stress relieving. I go to bed about 3:30am and wake up about 5:45am for crew. Am I dying? Do I have an ulcer? What's wrong with me?

A couple of questions for you: what are the long-term side effects of one abusing prescription painkillers, such as Vicodin? What advice can you give to someone who has gotten off of them to help them stay off???