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Old 07-25-2010, 05:38 PM
Join Date: Apr 1999
Location: Chicago,IL
Posts: 14,962
Are Some People Not Effected By Caffeine?

I sometimes work overnights at a temp job in a factory.

There was a new girl and she came from the first shift. (They only had open spots in the overnight shift)

She was all tired, so I told her to drink some coffee before she came next time. The next day she said she had three cups before she came but she didn't feel any more awake. She said she was not a coffee drinker but drank some that night, "just to see"

So the next day I brought her two of the Vivarin (Caffeine pills), each pill has 200mg of caffeine). I said, take only one and in a half hour if you're not awake take the other. She didn't drink any coffee that day.

She told me she took both pills and still didn't feel nothing. I asked her if she felt shaky or her heart was racing or anything like the jitters.

She said, "No, I don't feel anythings. it's like the pills were just sugar pills. No effect at all."

So I said "Well I guess you're just one of those people that caffeine doesn't effect."

I don't know if that's true or not, but I would venture there is always someone that isn't effected by something.

I do seem to recall someone claiming that people that suffer from Attention Deficit Disorder or hyperactivity or something like that aren't effected by caffeine.

Is this true? And also are some people just not effected by caffeine?

Last edited by Markxxx; 07-25-2010 at 05:39 PM. Reason: clarity
Old 07-25-2010, 05:51 PM
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Location: Jacksonville, FL
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Old 07-25-2010, 05:54 PM
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I am not affected by caffeine in the ways other people seem to describe. I don't drink coffee but I can drink soft drinks or anything else with caffeine in it and go straight to bed. I can't relate to what other people are feeling either. I wish it did work because I have needed something that would keep me awake while say driving but caffeine isn't it. I know that I am not completely immune to the effects though because I have downed enough coffee before to make me jittery and uncomfortable but no less tired. I may have ADD because my mother and oldest daughter do but I am not diagnosed myself.
Old 07-25-2010, 05:56 PM
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Location: Eastern Connecticut
Posts: 16,441
well, it doesnt wake me up but it negatively effects my heart rate. I used to love my expresso before bed but now it just triggers tachycardia and makes me worry about dying ... since I am now on 3 different cardiac meds for blood pressure I dont do coffee or any caffeine bearing liquids any longer =(

I really miss my bedtime coffee (
Old 07-25-2010, 05:56 PM
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I do seem to recall someone claiming that people that suffer from Attention Deficit Disorder or hyperactivity or something like that aren't effected by caffeine.
More precisely, they're not affected the same way by caffeine. Depending on the dosage, caffeine can help someone with ADD calm down and focus better, which seems opposite of how it affects most of us. The same is true for many other stimulants (Ritalin is a stimulant, too). The theory is that ADD folks don't produce as many natural stimulants as normal folks, and so go hyperactive as a means of trying to compensate.
Old 07-25-2010, 06:00 PM
Join Date: Nov 2008
Posts: 652
I'm never really affected by caffeine much, except by coffee for some strange reason. Soda pop and even Red Bull never give me a buzz. I can go to sleep after drinking a couple Red Bulls. But I feel edgy and my heart races after a cup or two of coffee. I may have developed a high enough tolerance level for caffeine that it takes a pretty high dose for me to feel it.
Old 07-25-2010, 06:10 PM
Join Date: Sep 2009
Location: The Internet. Since '84.
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Originally Posted by C. Montgomery Burns View Post
I'm never really affected by caffeine much, except by coffee for some strange reason. Soda pop and even Red Bull never give me a buzz. I can go to sleep after drinking a couple Red Bulls. But I feel edgy and my heart races after a cup or two of coffee. I may have developed a high enough tolerance level for caffeine that it takes a pretty high dose for me to feel it.
Usually, energy drinks use other things besides caffeine. You might be overly sensitive to it. I have also found that caffeine quality varies by product. I get the jitters after a half cup of Starbucks house blend, but 2 cups of Maxwell House instant barely wakes me up in the morning.
Old 07-25-2010, 06:47 PM
Join Date: Jun 2007
Location: Applachia
Posts: 2,068
Caffeine doesn't do diddly for me either.
Life without horses is possible but pointless.
Old 07-25-2010, 08:17 PM
Join Date: Apr 2000
Posts: 18,758
I don't get a high from caffeine - that is, I've never felt an increase in energy level, or gotten the jitters, or increased heart rate, or anything like that - but I do get the rebound downer a while later. So caffeine tends to make me tired.
Old 07-25-2010, 08:53 PM
Join Date: Mar 2003
Location: Seattle
Posts: 11,625
Most people have distorted ideas of how much caffeine is in various products.
Red Bull=80mg
Colas are limited by law to 71mg or less.
Coke 16oz=54
Mt Dew 16oz=54
Diet Coke 16oz=47
Dr Pepper 16oz=42
Diet DP 16oz=44
Tea 8 oz=53 (40-120)
Coffee 8oz=133 (102-200)
espresso 2oz= 150
Old 07-25-2010, 09:01 PM
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Originally Posted by picunurse View Post
Mt Dew 16oz=54
The link you provided says that a 12oz Mountain Dew is 54 mg of caffeine, not a 16oz.
Old 07-25-2010, 09:11 PM
Join Date: Aug 2009
Location: Chicago, IL
Posts: 3,810
I have an ADD diagnosis,and while I wouldn't say I am 'not affected' by caffeine, I can consume a shitload of it (and have many times) without feeling any different. I've never gotten the shakes or a faster heartbeat or felt 'revved up' from caffeine. Frankly I've never felt 'revved up' from anything.

Caffeine seems to help me focus a bit and I've been drinking coffee and tea since I was about 10.

I am physically dependent; I get a migraine if I don't have at least a little early in the day. Lately I consume a lot of caffeine every day from strong coffee-house espresso and coffee. Probably in excess of 600mg every day according to picunurse's link.
Old 07-25-2010, 09:27 PM
Join Date: Feb 2009
Location: Middle ear
Posts: 5,769
Originally Posted by Markxxx View Post

I do seem to recall someone claiming that people that suffer from Attention Deficit Disorder or hyperactivity or something like that aren't effected by caffeine.
That would explain something.

I can't stand the taste of coffee, but when I'm tired I sometimes drink a lot of Coke. It mostly does diddly squat. Or maybe it has minute effectiveness for me, but not the bouncing-up-and-down-at-three-A.M. reaction people talk about.
Old 07-25-2010, 10:11 PM
Join Date: Oct 2004
Location: NYC
Posts: 5,760
Yeah, coffee doesn't keep me awake or anything. Having soda or coffee or whatever at night doesn't stop me from falling asleep.
Old 07-25-2010, 10:58 PM
Join Date: Dec 2008
Posts: 926
I drink almost 2 liters of Pepsi a day and still go to sleep at 11 PM.
Old 07-25-2010, 11:10 PM
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Originally Posted by picunurse View Post
espresso 2oz= 150
Who drinks only 2 oz of espresso? When I have it, I usually order a ten-shot.

I have a so-called 'six cup' moka pot. (Really, two mugs.) One or two pots, and I'm fine. If I have three pots, my scalp itches.
Old 07-25-2010, 11:39 PM
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I love caffeine. I'd freebase the stuff if possible. It's a beautiful, natural drug that does so much with, compared to other stimulants, little negative health benefits. I can't tell you how many night shifts I wouldn't have been able to complete with full competency if it weren't for caffeine.

My mother, on the other hand. I've seen her on many, Many, MANY occasions over the years drink 1, 2, even three cups of strong (120mg+) cups of black coffee and an hour or 2 later sleep like a baby for 8-10 hours. WTF?
Old 07-25-2010, 11:51 PM
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I love coffee and tea but I can't tolerate caffeine at all (about a third of a cup of coffee is my limit before the jitters start); my husband hates coffee and tea and can drink pots of it with virtually no affect (he had a ridiculous amount of caffeine one day and just got a headache from it). I wouldn't say people are completely unaffected by it, but there are obviously personal differences (we're the same way with painkillers - two Tylenol work great for me, and he needs the real hard stuff before he gets any pain relief).
Old 07-25-2010, 11:59 PM
Join Date: Mar 2010
Location: Seoul, South Korea
Posts: 117
I am not affected by caffeine either.

I could take a whole pack of caffeine tablets, wash it down with a 2 litre bottle of Coke and some coffee, and go to sleep 10 minutes later.
Old 07-26-2010, 12:15 AM
Join Date: Aug 2008
Location: "Hicksville", Ark.
Posts: 32,837
I didn't think I was affected by caffeine until I got into benzo withdrawal. And then it was just the jitters that it gave me. It's never made me feel energized.

Adderall, on the other hand, did make me feel energized, without any jitters. Sometimes I wonder if my rediagnosis of not having ADHD is accurate. But there's no way I'm testing stimulants while in this grueling withdrawal.
Old 07-26-2010, 01:20 AM
Join Date: Mar 2000
Location: Oakland, CA, USA
Posts: 5,623
I've never noticed in myself any impacts from consuming caffeine. I regularly drink caffeinated diet sodas while going to sleep (that is, if I've started one I'll just leave it on the nightstand as my drink on hand should I wake up thirsty in the middle of the night).

I tend not to be a person who has difficulty waking up or staying awake (all of my all-nighters over the years have been unassisted) but when exceptions happen I've never found caffeine to be of any help. I've never tried any of the really high dose stuff (don't like coffee and rarely have never even tasted a Red Bull or other energy drink) so maybe it would be different if I tried it at those levels.

However, if I do get into a period of heavy caffeine consumption (once had a job where soda was free and I got into a more than a six pack a day of Diet Coke habit), I will get withdrawal headaches when I stop.
Old 07-26-2010, 01:58 PM
Join Date: Apr 2006
Location: SW Arkansas
Posts: 5,737
Looks like a good place to throw in my favorite caffeine link. Death by Caffeine. There's also a tab at the top with the caffeine content of just about every drink there is and a lot of foods.

I'm another one that can drink a pot of coffee and then go to sleep. Natural resistance or tolerance I couldn't say.
Old 07-26-2010, 02:34 PM
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Join Date: Aug 1999
Posts: 4,536
I seem to be less or at least differently affected by caffeine. It doesn't really help me wake up or concentrate. It does seem to stimulate some apparently useless part of my brain, with the result that I'm more likely to be distracted by the stimulation. And with enough of the stuff, I just sort of feel ill.

I also don't get any noticable effect from taurine, except to get a little sick if I consume enough of it.

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